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conoceras lo ultimo en nec,para el desarrollo de las instalaciones electricas inductriales en el ramo de la distribucion, de igual forma nos guiara por el camino para la determinacion de parametrso y factores de seguridad para eldesarrollo de una instalacion de casa o de ua oficina que nos indique que se requiere una amplia seguridad para cuidar la integridad de los ocupantes

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m NFPJf Copyright© 2019 National Fire Protection Association® One Batterymarch Park Quincy, Massachusetts 02169-7471 NFPA, NFPA 70, NationalFire Protection Association, NationalEkctrical Code, and NEC are registeredu·ademarks of the National Fire Protection Association. IMPORTANT NOTICES AND DISCLAIMERS CONCERNING NFPA® STANDARDS NFPA® codes, standards, recommended practices, and guides ("NFPA Standards"), of which the document contained herein is one, are developed through a consensus standards development process approved by the AmericanNational Standards Institute. This process brings together volunteers representing varied viewpoints and interests to achieve consensus on fire and other safety issues. While theNFPA administers the process and establishes rules to promote fairness in the development of consensus, it does not independently test, evaluate, or verify the accuracy of any information or the soundness of anyjudgments contained inNFPA Standards. TheNFPA disclaims liability for any personal injury, property, or other damages of any nature whatsoever, whether special, indirect, consequential or compensatory, directly or indirectly resulting from tl1e publication, use of, or reliance on NFPA Standards. TheNFPA also makes no guaranty or warranty as to the accuracy or completeness of any information published herein. In issuing and making NFPA Standards available, theNFPA is not undertaking to render professional or other services for or on behalf of any person or entity.Nor is the NFPA undertaking to perfom1 any duty owed by any person or entity to someone else. Anyone using this document should rely on his or her own independent judgment or, as appropriate, seek the advice of a competent professional in determining the exercise of reasonable care in any given circumstances. TheNFPA has no power, nor does it undertake, to police or enforce compliance with the contenL� ofNFPA Standards.Nor does theNFPA list, certify, test, or inspect products, designs, or installations for compliance �tl1 this document. Any certification or other statement of compliance with the requirements of this document shall not be attributable to theNFPA and is solely the responsibility of tl1e certifier or maker of the statement. ��� See ALERT ...., ALERT: TIDS STANDARD HAS BEEN MODIFIED BY A TIA OR ERRATA Users ofNFPA codes, standards, recommended practices, and guides ("NFPA Standards") should be aware thatNFPA Standards may be amended fr om time to time through the issuance of a Tentative Interim Amendment (TIA) or corrected by Errata. An officialNFPA Standard at any point in time consists of the current edition of the document together with any TIAs and Errata then in effect. To determine whether anNFPA Standard has been amended through the issuance of TIAs or corrected by Errata, go to www.nfpa.org/docinfo to choose fr om the list ofNFPA Standards or use the search feature to select theNFPA Standard number (e.g.,NFPA 13). The document information page provides up-to-date document-specific information as well as postings of all existing TIAs and Errata. It also includes the option to register for an " Alert" feature to receive an automatic email notification when new updates and other information are posted regarding the document.
IMPORTANT NOTICES AND DISCLAIMERS CONCERNING NFPA® STANDARDS Updating of NFPA Standards Users of NFPA codes, standards, recommended practices, and guides ("NFPA Standards") should be aware that these documents may be superseded at any time by the issuance of new editions or may be amended from time to time through the issuance of Tentative Interim Amendments or corrected by Errata. An official NFPA Standard at any point in time consists of the current edition of the document together with any Tentative Interim Amendments and any Errata then in effect. In order to determine whether a given document is the current edition and whether it has been amended through the issuance of Tentative Interim Amendments or corrected through the issuance of Errata, consult appropriate NFPA publications such as the National Fire Codes® Subscription Service, visit the NFPA website at www.nfpa.org, or contact the NFPA at the address listed below. Interpretations of NFPA Standards A statement, written or oral, that is not processed in accordance with Section 6 of the Regulations Governing the Development of NFPA Standards shall not be considered the official position of NFPA or any of its Committees and shall not be considered to be, nor be relied upon as, a Formal Interpretation. Patents The NFPA does not take any position with respect to the validity of any patent rights referenced in, related to, or asserted in connection with an NFPA Standard. The users of NFPA Standards bear the sole responsibility for determining the validity of any such patent rights, as well as the risk of infringement of such rights, and the NFPA disclaims liability for the infringement of any patent resulting from the use of or reliance on NFPA Standards. NFPA adheres to the policy of the American National Standards Institute (ANSI) regarding the inclusion of patents in American National Standards ("the ANSI Patent Policy"), and hereby gives the following notice pursuant to that policy: NOTICE: The user's attention is called to the possibility that compliance with an NFPA Standard may require use of an invention covered by patent rights. NFPA takes no position as to the validity of any such patent rights or as to whether such patent right5 constitute or include essential patent claims under the ANSI Patent Policy. If, in connection with the ANSI Patent Policy, a patent holder has filed a statement of willingness to grant licenses under these rights on reasonable and nondiscriminatory terms and conditions to applicants desiring to obtain such a license, copies of such filed statements can be obtained, on request, from NFPA. For further information, contact the NFPA at the address listed below. Law and Re g ulations Users of NFPA Standards should consult applicable federal, state, and local laws and regulations. NFPA does not, by the publication of its codes, standards, recommended practices, and guides, intend to urge action that is not in compliance with applicable laws, and these documents may not be consu·ued as doing so. Copyrights NFPA Standards are copyrighted. They are made available for a wide variety of both public and private uses. These include both use, by reference, in laws and regulations, and use in private self-regulation, standardization, and the promotion of safe practices and methods. By making these documents available for use and adoption by public authorities and private users, the NFPA does not waive any rights in copyright to these documents. Use of NFPA Standards for regulatory purposes should be accomplished through adoption by reference. The term "adoption by reference" means the citing of title, edition, and publishing information only. Any deletions, additions, and changes desired by the adopting authority should be noted separately in the adopting insu1.11nent. In order to assist NFPA in following the uses made of its documents, adopting authorities are requested to notify tl1e NFPA (Attention: Secretary, Standards Council) in writing of such use. For technical assistance and questions concerning adoption of NFPA Standards, contact NFPA at the address below. For Further Information All questions or other communications relating to NFPA Standards and all requests for information on NFPA procedures governing its codes and standards development process, including information on the procedures for requesting Formal Interpretations, for proposing Tentative Interim Amendments, and for proposing revisions to NFPA standards during regular revision cycles, should be sent to NFPA headquarters, addressed to the attention of the Secretary, Standards Council, NFPA, l Battery.march Park, P.O. Box 9101, Quincy, MA 02269-9101; email: stds_admin@nfpa.org For more information about NFPA, visit the NFPA website at www.nfpa.org. All NFPA codes and standards can be viewed at no cost at www.nfpa.org/docinfo.
Copyright© 2019 National Fire Protection Association® . All Rights Rese1ved. NFPA 70® National Electrical Code ® 2020 Edition This edition of NFPA 70, NationalElectrical Code, was prepared by the National Electrical Code Committee and acted on by NFPA at itsJune Association Technical Meeting heldJune 17-20, 2019, in San Antonio, TX. It was issued by the Standards Council on August 5, 2019, with an effective date of August 25, 2019, and supersedes all previous editions. This Code was issued with Tentative Interim Amendments (TIAs) that impacted provisions in 210.52(C)(2), 240.67(C}, 240.87(C), 725.121(C}, and Annex D3. For more information on TIAs, see www.nfpa.org/70 and Section 5 of the Regulations Governingthe Development ofNFPA Standards available at www.nfpa.org/regs. This edition of NFPA 70was approved as an American National Standard on August 25, 2019. History and Development of the National Electrical Code® The National Fire Protection Association has acted as sponsor of the NationalElecl1ical Code since 1911. The original Code document was developed in 1897 as a result of the united efforts of various insurance, electrical, architectural, and allied interests. In accordance with the Regulations Governingthe Development ofNFPA Standards, a NationalElect1ical Code first draft report containing proposed amendments to the 2017 National fiectrical Code was published by NFPA inJuly 2018. This report recorded the actions of the various code-making panels and the correlating committee of the National Elecu·ical Code Committee on each public input and first revision that had been made to revise the 2017 Code. The report was published at www.nfpa.org/70. Following the close of the public comment period, the code-making panels met, acted on each comment, and created some second revisions, which were reported to the correlating committee. NFPA published the NationalElectrical Code second draft report in April 2019, which recorded the actions of the code-making panels and the correlating committee on each public comment on the National Electrical Code Committee first draft report. 111e Nationall!-,ectrical Code first draft report and the NationalElecl1ical Code second draft report were presented to the 2019June Association Technical Meeting for adoption. NFPA has an Electrical Section that provides par ticular opportunity for NFPA members interested in elecu-ical safety to become better in.formed and to contribute to the development of the National El.ectrical Code and other NFPA elecu·ical standards. At the Elecu·ical Section codes and standards review session held at the 2019 NFPA Conference and Expo, section members had the opportunity to discuss and review the report of the National Electrical Code Committee prior to the adoption of this edition of the Code by the association at its 2019June Technical Meeting. This 55th edition supersedes all other previous editions, supplements, and printings dated 1897, 1899, 1901, 1903, 1904, 1905, 1907, 1909, 1911, 1913, 1915, 1918, 1920, 1923, 1925, 1926, 1928, 1930, 1931, 1933, 1935, 1937, 1940, 1942, 1943, 1947, 1949, 1951, 1953, 1954, 1955, 1956, 1957, 1958, 1959, 1962, 1965, 1968, 1971, 1975, 1978, 1981, 1984, 1987, 1990, 1993, 1996, 1999, 2002, 2005, 2008, 2011, 2014, and 2017. This Code is purely advisory as far as NFPA is concerned. It is made available for a wide variety of both public and private uses in the interest of life and property protection. These include both use in law and for regulatory purposes and use in private self-regulation and standardization activities such as insurance underwriting, building and facilities construction and management, and product testing and certification. NFPA 70, National Electrical Code, NFPA and National Fire Protection Association are registered trademarks of the National Fire Protection Association, Quincy, Massachuseu.s 02169.
NATIONAL ELEC TRIC AL CODE Contents 90 Introduction ......................................................... 70- 29 100 Part I. Part II. Part Ill. IIO Part I. Part II. Part Ill. Part IV. Part V. Chapter 1 General Definitions ............................................ General ................................................................. Over 1000 Volts, Nominal .................................... Hazardous (Classified) Locations (CMP-14). ... Requirements for Electrical Installations ........... General ................................................................. 1000 Volts, Nominal, or Less .............................. . Over 1 000 Volts, Nominal .................................... Tunnel Installations over IOOO Volts, Nominal . Manholes and Other Electrical Enclosures Intended for Personnel Entry ............................. Chapter 2 Wiring and Protection 200 Use and Identification ofGrounded 210 Part I. Part II. Part Ill. 215 220 Part I. Part II. Part Ill. Part IV. Part V. 225 Part I. Part II. Part Ill. 230 Part I. Part II. Part Ill. Part IV. Part V. Part VI. Part VII. Part VIII. 240 Part I. Part II. Part Ill. Part IV. Part V. Part VI. Part VII. Conductors ....................................................... Branch Circuits .................................................... General Provisions ............................................... Branch-Circuit Ratings ........................................ Required Outlets .................................................. feeders ..................................................... Branch-Circuit, feeder, and Service Load Calculations .......................................................... General ................................................................. Branch-Circuit Load Calculations ....................... feeder and Service Load Calculations ............... Optional feeder and Service Load Calculalions .......................................................... farm Load Calculations ....................................... Outside Branch Circuits and feeders ................. General ................................................................. Buildings or Other Str uctures Supplied b y a feeder(s) or Branch Circuit(s) ........................... Over I000 Volts. ................................................... Se,vices ................................................... General ................................................................. Overhead Service Conductors ............................. Underground Se1vice Conductors ...................... Service-Enu·ance Conductors .............................. Service Equipment - General ........................... Service Equipment- Disconnecting Means ..... Service Equipment- Overcurrent Protection .. Services Exceeding I 000 Volts, Nominal ............ Overcurrent Protection ....................................... General ................................................................. Location ................................................................ Enclosures ............................................................ Disconnecting and Guarding .............................. Plug fuses, fuseholders, and Adapters .............. Cartridge fuses and fuseholders ........................ Circuit Breakers ................................................... Part VIII. Supervised lndusu·ial Installations ...................... Part IX. Overcurrent Protection over IOOO Volts, 242 Part I. Part II. Part Ill. 250 Part I. Part II. 70-2 Nominal ................................................................ Overvoltage Protection ........................................ General ................................................................. Surge-Protective Devices (SPDs), 1000 Volts or Less ....................................................................... Surge Arresters, Over 1000 Volts ......................... Grounding and Bonding ..................................... General ................................................................. SystemGrounding ............................................... 70- 32 70- 32 70- 41 70- 42 70- 46 70- 46 70- 50 70- 52 70- 55 70- 56 70- 58 70- 60 70- 60 70- 65 70- 68 70- 71 70- 73 70- 73 70- 74 70- 76 70- 79 70- 81 70- 82 70- 82 70- 85 70- 86 70- 88 70- 88 70- 89 70- 90 70- 91 70- 93 70- 93 70- 95 70- 96 70- 97 70- 97 70- 101 70- l04 70- 104 70- 104 70- l04 70- 105 70- 107 70- 108 70- 109 70- 109 70- 109 70- 110 70- I l l 70- 111 70- 113 Part Ill. Part IV. Part V. Part VI. Part VII. Part VIII. Part IX. Part X. Grounding Electrode System and Grounding Electrode Conductor ........................................... 70- 120 Enclosure, Raceway, and Service Cable Connections ......................................................... 70- 125 Bonding ................................................................ 70- 125 Equipment Grounding and Equipment Grounding Conductors ....................................... 70- 129 Methods ofEquipment Grounding Conductor Connections ......................................................... 70- 133 Direct-Current Systems ........................................ 70- 135 Instruments, Meters, and Relays ......................... 70- 136 Grounding of Systems and Circuits ofover 1000 Volts ............................................................. 70- 137 Chapter 3 Wiring Methods and Materials 300 Part I. Part II. 310 Part I. Part II. Part III. 311 Part I. Part II. Part Ill. Part IV. 312 Part I. Part II. 314 Part I. Part II. Part 111. Part IV. 320 Part I. Part II. Part Ill. 322 Part I. Part II. Part III. 324 Part I. Part II. Part Ill. 326 Part I. Part II. Part III. 330 Part I. Part II. Part Ill. 332 Part I. Part II. General Requirements for Wiring Metl1ods and Materials ............................................................... 70- 140 General Requirements ......................................... 70- 140 Requirements forover IOOO Volts, Nominal ...... 70- 149 Conductors for General Wiring .......................... 70- 151 General ................................................................. 70- 151 Construction Specifications ................................ 70- 151 Installation ............................................................ 70- 156 Medium Voltage Conductors and Cable ............ 70- 165 General ................................................................. 70- 165 Construction Specifications ............................... 70- 165 Installation ............................................................ 70- 167 Ampacities ............................................................ 70- 168 Cabinets, Cutout Boxes, and Meter Socket Enclosures ............................................................ 70- 179 Scope and Installation ................... ..................... 70- 179 Consm1ction Specifications ................................ 70- 182 Outlet, Device, Pull, andJunction Boxes; Conduit Bodies; Fittings; and Handhole Enclosures ........................................................ Scope and General ............................................... Installation ............................................................ Constr uction Specifications ................................ Pull andJunction Boxes, Conduit Bodies, and Handhole Enclosures for Use on Systems over 1000 Volts, Nominal ............................................. Armored Cable: Type AC ..................................... General ................................................................. Installation ............................................................ Construction Specifications ................................ Flat Cable Assemblies: Type fC ........................... General ................................................................. Installation ............................................................ Construction Specifications ................................ Flat Conductor Cable: Type FCC ........................ General ................................................................. Installation ............................. .............................. Construction Specifications ................................ Integrated Gas Spacer Cable: Type IGS .............. General ................................................................. Installation ............................................................ Construction Specifications ................................ Metal-Clad Cable: Type MC ................................. General ................................................................. Installation ............................................................ Consu·uction Specifications ................................ Mineral-Insulated, Metal-Sheathed Cable: Type 70- 182 70- 182 70- 183 70- 189 70- 189 70- 190 70- 190 70- 190 70- 191 70- 191 70- 191 70- 192 70- 192 70- 192 70- 192 70- 193 70- 194 70- 194 70- 194 70- 194 70- 195 70- 195 70- 195 70- 195 70- 197 Ml .......................................................................... 70- 197 General ................................................................. 70- I97 Installation ............................................................ 70- 197 NATIONAL ELECTRICAL CODE 2020 Edition
CONTENTS Part III. 334 Part I. Part II. Part III. 336 Part I. Part II. Part III. 337 Part I. Part II. Part III. 338 Part I. Part II. Part III. 340 Part I. Part II. Part III. 342 Part I. Part II. Part III. 344 Part I. Part II. Part III. 348 Part I. Part II. 350 Part I. Part II. Part III. 352 Part I. Part II. Part III. 353 Part I. Part II. Part III. 354 Part I. Part II. Part III. 355 Part I. Part II. Part III. 356 Part I. Part II. Part Ill. 358 Part I. Part II. Part III. Construction Specifications ................................ 70- 198 Nonmetallic-Sheathed Cable: Types NM and NMC ...................................................................... 70- 198 General ................................................................. 70- 198 Installation ............................................................ 70- 198 Construction Specifications ................................ Power and Control Tray Cable: Type TC ............ General ................................................................. Installation ............................................................ Construction Specifications ................................ Type P Cable ........................... ............................. General ................................................................. Installation ............................................................ Construction Specifications ................................ Service-Entrance Cable: Types SE and USE ....... General ................................................................. Installation ............................................................ Construuion Specifications ................................ Underground Feeder and Branch-Circuit 70- 200 70- 200 70- 200 70- 200 70- 201 70- 202 70- 202 70- 202 70- 202 70- 202 70- 202 70- 203 70- 203 Cable: Type UF ..................................................... 70- 204 General ........................................... ..................... 70- 204 Installation ............................................................ 70- 204 Construction Specifications ................................ 70- 204 Intermediate Metal Conduit: Type IMC ............. 70- 204 General ................................................................. 70- 204 Installation ............................................................ 70- 204 Construction Specifications ................................ 70- 206 Rigid Metal Conduit: Type RMC ......................... 70- 206 General ................................................................. 70- 206 Installation ............................................................ 70- 206 Construction Specifications ................................ 70- 207 Flexible Metal Conduit: Type FMC ..................... 70- 207 General ................................................................. 70- 207 Installation .......................... ................................. 70- 208 Liquidtight Flexible Metal Conduit: Type LFMC .................................................................... 70- 209 General ................................................................. 70- 209 Installation ............................................................ 70- 209 Construction Specifications ................................ 70- 210 Rigid Polyvinyl Chloride Conduit: Type PVC ..... 70- 210 General ................................................................. 70- 210 Installation ............................................................ 70- 2IO Construction Specifications ................................ 70- 212 High Density Polyethylene Conduit: Type HOPE Conduit ... ................................................. General ................................................................. Installation ............................................................ Construction Specifications ................................ Nonmetallic Underground Conduit with 70- 212 70- 212 70- 213 70- 213 Conductors: Type NUCC ..................................... 70- 213 General ................................................................. 70- 213 Installation ............................................................ 70- 214 Construction Specifications ................................ 70- 214 Reinforced T hermosetting Resin Conduit: Type RTRC ................... ................................................. General ................................................................. Installation ............................................................ Construction Specifications ........................... Liquidtight Flexible Nonmetallic Conduit: Type 70- 215 70- 215 70- 215 70- 216 LFNC ..................................................................... 70- 217 General ................................................................. 70- 217 Installation ............................................................ 70- 217 Construction Specifications ................................ 70- 218 Electrical Metallic Tubing: Type EMT ................ 70- 218 General ................................................................. 70- 218 Installation ............................................................ 70- 218 Construction Specifications ................................ 70- 219 2020 Edition NATIONAL ELECTRICAL CODE 360 Part I. Part II. Part Ill. 362 Part I. Part II. Part Ill. 366 Part I. Part II. Part 111. 368 Part I. Part II. Part 111. Part IV. 370 Part I. Part II. Part Ill. 372 Part I. Part II. 374 Part I. Part II. Part Ill. 376 Part I. Part II. Part Ill. 378 Part I. Part II. Part Ill. 380 Part I. Part II. 382 Part I. Part II. Part Ill. 384 Part I. Part II. Part Ill. 386 Part I. Part II. Part 111. 388 Pan I. Pan II. Part 111. 390 Pan I. Part II. 392 Pan I. Part II. Part Ill. 393 Part I. Pan II. Flexible Metallic Tubing: Type FMT ................... 70- 219 General ................................................................. 70- 219 Installation ............................................................ 70- 220 Construction Specifications ................................ 70- 220 Electrical Nonmetallic Tubing: Type ENT ......... 70- 220 General ................................................................. 70- 220 Installation ............................................................ 70- 22I Construction Specifications ................................ 70- 222 Arndliary Gutters .................................................. 70- 222 General ................................................................. 70- 222 Installation ............................................................ 70- 222 Consa-uction Specifications ................................ 70- 223 Busways ................................................................. 70- 224 General Requirements ......................................... 70- 224 Installation ............................................................ 70- 224 Construction ......................................................... 70- 225 Requirements for Over I000 Volts, Nominal ..... 70- 225 Cablebus ............................................................... 70- 226 General ................................................................. 70- 226 Installation ............................................................ 70- 226 Construction Specifications ................................ 70- 227 Cellular Concrete Floor Raceways ...................... 70- 227 General ................................................................. 70- 227 Installations .......................................................... 70- 227 Cellular Metal Floor Raceways ............................ 70- 228 General ................................................................. 70- 228 Installation ...................................................,........ 70- 228 Construction Specifications .......................... ...... 70- 229 Metal Wireways ..................................................... 70- 229 General ................................................................. 70- 229 Installation ............................................................ 70- 229 Construction Specifications .... ........................... 70- 230 Nonmetallic Wireways .......................................... 70- 230 General ................................ ................................ 70- 230 Installation ............................................................ 70- 230 Construction Specifications ................................ 70- 231 MultioutletAssembly ........................................... 70- 231 General ................................................................. 70- 231 Installation ............................................................ 70- 231 Nonmetallic Extensions ....................................... 70- 232 General ................................................................. 70- 232 Installation ............................................................ 70- 232 Construction Specifications (Concealable Nonmetallic Extensions Only) ............................ 70- 233 Sa-ut-Type Channel Raceway ............................... 70- 233 General ................................................................. 70- 233 Installation ............................................................ 70- 233 Consa-uction Specifications ................................ 70- 234 Surface Metal Raceways ....................................... 70- 234 General ................................................................. 70- 234 Installation ............................................................ 70- 234 Consm,ction Specifications ................................ 70- 235 Surface Nonmetallic Raceways ............................ 70- 235 General ................................................................. 70- 235 Installation ............................................................ 70- 235 Consu-t1ction Specifications ................................ 70- 236 Underfloor Raceways ........................................... 70- 236 General ................................................................. 70- 236 Installation ............................................................ 70- 236 Cable Trays ........................................................... 70- 237 General ................................................................. 70- 237 Installation ............................................................ 70- 237 Construction Specifications ................................ 70- 243 Low-Voltage Suspended Ceiling Power Distribution Systems ............................................ 70- 244 General ................................................................. 70- 244 Installation ............................................................ 70- 244 70-3
Part Ill. 394 Part I. Part II. Part Ill. 396 Part I. Part II. 398 Part I. Part II. Part Ill. 399 400 Part I. Part II. Part Ill. 402 404 Part I. Part II. 406 408 Part I. Part II. Part Ill. Part IV. 409 Part I. Part fl Part Ill. 410 Part I. Part II. Part Ill. Part IV. Part V. Part VI. Part VII. Part VIII. Part IX. Part X. Part XI. Part XII. Part XIII. Part XIV. Part XV. Part XVI. 411 422 Part I. Part II. Part Ill. Part IV. Part V. 424 Part I. 70-4 NATIONAL ELECTRICAL CODE Construction Specifications ................................ 70- 245 Concealed Knol:>-and-Tube Wiring ..................... 70- 246 General ................................................................. 70- 246 Installation ............................................................ 70- 246 Construction Specifications ................................ 70- 246 Messenger-Supported Wiring .............................. 70- 247 General ................................................................. 70- 247 Installation ............................................................ 70- 247 Open Wiring on Insulators ................................. 70- 247 General ................................................................. 70- 247 Installation ............................................................ 70- 248 Construction Specifications ................................ 70- 249 Outdoor Overhead Conductors over I 000 Volts ............................................................. 70- 249 Chapter 4 Equipment for General Use Flexible Cords and Flexible Cables ..................... 70- 250 General ................................................................. 70- 250 Construction Specifications ................................ 70- 259 Portable Cables Over 600 Volts, Nominal .......... 70- 260 Fixture Wires ........................................................ 70- 260 Switches ................................................................ 70- 263 Installation ............................................................ 70- 263 Construction Specifications ................................ 70- 266 Receptacles, Cord Connectors, and Attachment Plugs (Caps) ......................................................... 70- 266 Switchboards, Switchgear, and Panelboards ...... 70- 271 General ................................................................. 70- 271 Switchboards and Switchgear .............................. 70- 273 Panelboards .......................................................... 70- 273 Construction Specifications ................................ 70- 274 Industrial Control Panels .................................... 70- 275 General ................................................................. 70- 275 Installation ............................................................ 70- 275 Construction Specifications ......................... 70- 276 Luminaires, L�mpholders, and L�mps ............... 70- 277 General .......................................................... 70- 277 Luminaire Locations ............................................ Provisions at Luminaire Outlet Boxes, Canopies, and Pans .............................................. Luminaire Supports ............................................. Grounding ............................................................ Wiring ofLuminaires ........................................... Construction of Luminaires ................................ Installation of L�mpholders ................ Lamps and Auxiliary Equipment ........................ Special Provisions for Flush and Recessed Lu.minaires ........................................................... Construction of Flush andRecessed Lu.n1inaires ........................................................... Special Provisions for Electric-Discharge Lighting Systems of IOOO Volts or Less ............... Special Provisions for Electric-Discharge Lighting Systems of More Than 1000 Volts ........ Lighting Track ...................................................... Decorative Lighting and Similar Accessories ..... Special Provisions for Horticultural Lighting Equipment ............................................................ Low-Voltage Lighting ........................................... Appliances ............................................................ General ................................................................. 70- 278 70- 279 70- 279 70- 280 70- 280 70- 282 70- 282 70- 282 70- 282 70- 283 70- 283 70- 284 70- 285 70- 285 70- 285 70- 286 70- 286 70- 286 Installation ............................................................ 70- 287 Disconnecting Means ........................................... 70- 289 Construction ..................... ................................... 70- 290 Marking ................................................................ 70- 291 Fixed Electric Space-Heating Equipment .......... 70- 291 General ................................................................. 70- 291 Part II. Part Ill. Part IV. Part V. Part VI. Part VII. Part VIII. Part IX. Part X. 425 Part I. Part II. Part 111. Part IV. Part V. Part VI. Part VII. 426 Part I. Part II. Part Ill. Part IV. Part V. Part VI. 427 Part I. Part II. Part Ill. Part IV. Part V. Part VI. Part VII. 430 Part I. Part II. Part Ill. Part IV. Part V. Installation ............................................................ 70- 291 Control and Protection of Fixed Electric Space- Heating Eqttipment ............................................. 70- 292 Marking of Heating Equipment .......................... 70- 293 Electric Space-Heating Cables ............................. 70- 293 Duct Heaters ........................................................ 70- 295 Resistance-Type Boilers ........................................ 70- 295 Electrode-Type Boilers ......................................... 70- 296 Electric Radiant Heating Panels and Heating Panel Sets .............................................................. 70- 297 Low-Voltage FixedElectric Space-Heating Equipment ............................................................ 70- 298 FixedResistance and Electrode Industrial Process Heating Equipment ................................ 70- 299 General ................................................................. 70- 299 Installation ............................................................ 70- 299 Control and Protection of Fixed Industrial Process Heating Equipment ................................ 70- 299 Marking of Heating Equipment .......................... 70- 301 Fixed Industrial Process Duct Heaters ............... 70- 30I Fixed Industrial Process Resistance-Type Boilers ................................................................... 70- 30I Fixed Industr ial Process Electrode-Type Boilers 70- 302 Fixed Outdoor Electric Deicing and Snow- Melting Equipment .............................................. 70- 303 General ................................................................. 70- 303 Installation ............................................................ 70- 303 Resistance Heating Elements .............................. 70- 303 Impedance Heating ............................................. 70- 304 Skin-Effect Heating .............................................. 70- 304 Control and Protection ....................................... 70- 305 Fixed Electric Heating Equipment for Pipelines and Vessels ............................................................ 70- 305 General ................................................................. 70- 305 Installation .......................................... .................. 70- 306 Resistance Heating Elements .............................. 70- 306 Impedance Heating .............................,............... 70- 306 Induction Heating ............................................... 70- 307 Skin-Effect Heating .............................................. 70- 307 Control and Protection ....................................... 70- 307 Motors, Motor Circttits, and Controllers ............ 70- 308 General ................................................................. 70- 308 Motor Circuit Conductors ................................... 70- 313 Motor and Branch-Circuit Overload Protection 70- 315 Motor Branch-Circuit Shon-Circuit and Ground-Fault Protection ...................... 70- 318 Motor Feeder Short-Circuit and Ground-Fault Protection ............................................................. 70- 321 Part VI. Motor Control Circuits ........................................ 70- 321 Pan VII. Motor Controllers ................................................ 70- 323 Part VIII. Motor Control Centers ........................................ 70- 324 70- 325 70- 327 70- 329 70- 330 70- 330 70- 330 70- 335 70- 335 70- 336 Part IX. Part X. Part XI. Part XII. Part XIII. Part XIV. 440 Part I. Part II. Part III. Disconnecting Means ........................................... Adjustable-Speed Drive Systems ...... ................... Over 1000 Volts, Nominal .................................... Protection of Live Parts-All Voltages .............. Grounding-All Voltages ................................. Tables .................................................................... Air-Conditioning and Refrigerating Eqttipment General .................................... ............................ Disconnecting Means ........................................... Branch-Circuit Short-Circuit and Ground-Fault Protection ............................................................. 70- 337 Pan IV. Branch-Circuit Conductors ................................. 70- 338 Part V. Controllers for Motor-Compressors .................... 70- 339 Part VI. Motor-Compressor and Branch-Circuit Overload Protection ............................................ 70- 339 Part VII. Provisions for Room Air Conditioners ............... 70- 340 NATIONAL ELECTRICAL CODE 2020 Edition
CONTENTS 445 450 PartI. PartII. PartI ll. 455 PartI. PartII. 460 PartI. PartII. 470 Part I. Part II. 480 490 Part I. Part II. Part I ll. Part IV. Part V. 500 501 Pan I. PartII. PartI ll. 502 PartI. Pan II. PartI ll. 503 Pan I. PartII. PartI ll. 504 505 506 510 511 513 514 515 516 PartI. PartII. PartI ll. PartIV. PartV. 517 Pan I. PartII. PartI ll. Pan IV. Pan V. Generators............................................................ 70- 340 Transformers and TransformerVaults (I ncluding Secondary Ties) ................................ 70- 342 GeneralProvisions............................................... 70- 342 SpecificProvisionsApplicable to Different Types of Transformers......................................... 70- 346 TransformerVaults............................................... 70- 348 PhaseConverters.................................................. 70- 349 General................................................................. 70- 349 SpecificProvisionsApplicable to Different Types of PhaseConverters................................... 70- 350 Capacitors............................................................. 70- 350 1000Volts, Nominal, and Under........................ 70- 350 Over 1000Volts, Nominal.................................... 70- 351 Resistors andReactors......................................... 70- 352 1000Volts, Nominal, and Under........................ 70- 352 Over 1000Volts, Nominal.................................... 70- 352 Storage Batteries.................................................. 70- 352 Equipment Over 1000Volts, Nominal................ 70- 355 General................................................................. 70- 355 Equipment- SpecificProvisions....................... 70- 355 Equipment- Switchgear andI ndustrial ControlAssemblies.............................................. 70- 357 Mobile and Portable Equipment........................ 70- 359 Electrode-TypeBoilers......................................... 70- 360 Chapter 5 Special Occupancies Hazardous (Classified) Locations, Clas sesI , II , andI ll, Divisions I and 2..................................... ClassI Locations......................................... General................................................................. Wiring............... ............................. ..................... Equipment......................................... ,.................. Class II Locations ................................................. General............... ................................................. Wiring................................................................... Equipment............................................................ ClassI ll Locations................................................ General................................................................. Wiring............... ............................. ..................... Equipment............................................................ I ntrinsically Safe Systems..................................... Zone 0, I, and 2Locations. ................................ Zone 20, 21, and 22Locations forCombustible Dusts or lgnitible Fibers/Flyings......................... Hazardous (Classified) Locations- Specific.... Commercial Garages, Repair and Storage......... Aircraft Hangars ................ .................................. Motor FuelDispensing Facilities........ Bulk Storage Plants ....................................... SprayApplication, Dipping, Coating, and Printing Processes Using Flammable or 70- 361 70- 368 70- 368 70- 368 70- 373 70- 377 70- 377 70- 378 70- 380 70- 383 70- 383 70- 383 70- 384 70- 386 70- 388 70- 402 70- 408 70- 409 70- 411 70- 414 70- 420 Combustible Materials......................................... 70- 423 General................................................................. 70- 423 OpenContainers.................................................. 70- 424 SprayApplication Processes................................ 70- 424 SprayApplication Operations in Membrane Enclosures............................................................ 70- 431 Printing, Dipping, andCoating Processes.......... 70- 432 HealthCare Facilities........................................... 70- 434 General................................................................. 70- 434 Wiring and Protection......................................... 70- 437 Essential Electrical System ( EES) ........................ 70- 440 I nhalationAnesthetizing Locations.................... 70- 447 X-RayI nstallations............................................... 70- 449 2020 Edition NATIONAL ELECTRICAL CODE PanV I. PartV II. 518 520 PartI. PartII. PartI ll. PartIV . Part/. PartVI. PartV II. 522 PartI. PartII. Part111. 525 PartI. PartII. PartI ll. PartIV. 530 PartI. PartII. PartI ll . PartIV . Part/. PartV I. 540 PartI. PartII. Part 111. PartIV . 545 PartI. PartII. 547 550 PartI. PartII. PartI ll . 551 PartI. PartII. PartI ll . PartIV. Part/. PartV I. 552 PartI. PartII. PartI ll. PartIV . PartV . Communications, Signaling Systems, Data Systems, FireAlarm Systems, and Systems Less Than 120Volts, Nominal..................................... 70- 450 IsolatedPowerSystems........................................ 70- 451 Assembly Occupancies.................................. 70- 452 Theaters, Audience Areas of Motion Picture and Television Studios, PerformanceAreas, and SimilarLocations................................................. 70- 453 General................................................................. 70- 453 Fixed Stage Switchboards.................................... 70- 454 Fixed Stage Equipment Other T han Switchboards........................................................ 70- 455 Portable Switchboards on Stage.......................... 70- 457 Portable Stage Equipment Other Than Switchboards........................................................ 70- 459 DressingRooms, DressingAreas, and Makeup Areas. .................................................................... 70- 460 EquipmentGroundingConductor..................... 70- 460 Control Systems for Permanent Amusement Attractions............................................................ 70- 461 General................................................................. 70- 461 ControlCircuits.................................................... 70- 461 ControlCircuitWiring Methods......................... 70- 461 Carnivals,Circuses, Fairs, and Similar Events.... 70- 462 GeneralRequirements......................................... 70- 462 Power Sources...................................................... 70- 463 WiringMethods................................................... 70- 463 EquipmentGrounding and Bonding................. 70- 464 MotionPicture and Television Studios and SimilarLocations................................................. 70- 464 General................................................................. 70- 464 Stage or Set........................................................... 70- 465 DressingRooms.................................................... 70- 467 Viewing, Cutting, and Patching Tables............... 70- 467 Cellulose Niu·ate Film StorageVaults................. 70- 467 Substations............................................................ 70- 467 MotionPictureProjectionRooms...................... 70- 467 General................................................................. 70- 467 Equipment andProjectors of theProfessional Type....................................................................... 70- 467 NonprofessionalProjectors................................. 70- 468 Audio SignalProcessing, Amplification, and Reproduction Equipment................................... 70- 468 ManufacturedBuildings andRelocatable Structures............................................................. 70- 468 General................................................................. 70- 468 Relocatable Structures......................................... 70- 469 AgriculturalBuildings.......................................... 70- 470 MobileI-Jomes, ManufacturedI-Jomes, and MobileI-Jome Parks............................................. 70- 472 General................................................................. 70- 472 Mobile andManufacturedI-Jomes...................... 70- 473 Services and Feeders............................................ 70- 479 RecreationalVehicles andRecreationalVehicle Parks...................................................................... General................................................................. Combination Electrical Systems.......................... Other Power Sources........... ..................... Nominal 120.Volt or 120/240-Volt Systems........ Factory Tests......................................................... RecreationalVehicleParks ................ ,................. Park Trailers......................................................... General................................................................. Low-VoltageSystems............................................ Combination Electrical Systems.......................... Nominal 120.Volt or 120/240-Volt Systems........ Factory Tests......................................................... 70- 480 70- 480 70- 481 70- 482 70- 483 70- 489 70- 489 70- 491 70- 491 70- 492 70- 493 70- 493 70- 500 70-5
555 Part I. Part II. Part Ill. 590 600 Part I. Part II. 604 605 610 Part I. Part II. Part Ill. Part IV. Part V. Part VI. Part VII. 620 Part I. Part II. Part Ill. Part IV. Part V. Part VI. Part VII. Part VIII. Part lX. Part X. 625 Part I. Part II. Part Ill. Part IV. 626 Part I. Part II. Part Ill. Part IV. 630 Part I. Part II. Part Ill. Part IV. 640 Part I. Part II. Part Ill. 645 646 Part I. Part II. Part Ill. Part IV. 647 650 70-6 NAT IONAL ELECTRICAL CODE Marinas, Boatyards, Floating Buildings, and Com�nercial and Noncommercial Docking F'ac1hues ......................................................... General ................................................................. Marinas, Boatyards, and Docking Facilities ........ Floating Buildings ................................................ Temporary Installations ....................................... Chapter 6 Special Equipment 70- 500 70- 500 70- 502 70- 504 70- 504 Electric Signs and Outline Lighting ................... 70- 508 General ................................................................. 70- 508 Field-Installed Skeleton Tubing, Outline Lighting, and Secondary Wiring ......................... Manufactured Wiring Systems ............................ Office Furnishings ............................................... Cranes and Hoists ................................................ General ................................................................. Wiring ................................................................... Contact Conductors ............................................. Disconnecting Means ........................................... Overcurrent Protection ....................................... Control ...................... .......................................... Grounding and Bonding ..................................... Elevators, Dumbv1aiters, Escalators, Nloving Walks, Platform Lifts, and Stairway Chairlifts ..... General ................................................................. Conductors ........................................................... Wiring ................................................................... Installation of Conductors ................................... Traveling Cables ...... ............................................ Disconnecting Means and Control ..................... Overcurrent Protection ....................................... Machine Rooms, Control Rooms, Machinery Spaces, and Control Spaces ................................. Grounding and Bonding ..................................... Emergency and Standby Power Systems ............. Electric Vehicle Power Transfer System General ................................................................. Equipment Construction ..................................... Installation ............................................................ Wireless Power Transfer Equipment ................... Electrified Truck Parking Spaces ........................ General ............ .................................................... Electrified Truck Parking Space Electrical Wiring Systems ..................................................... Electrified Truck Parking Space Supply Equipment ............................................................ Transport Refrigerated Units (TRUs) ................ Electric Welders ................................................... General ................................................................. Arc Welders .......................................... Resistance Welders ............................................... Welding Cable ...................................................... Audio Signal Processing, Amplification, and Reproduction Equipment................................... General ................................................................. PermanentAudio System Installations ............... Portable and Temporary Audio System Installations .......................................................... Information Technology Equipment .................. Modular Data Centers ......................................... General ................................................................. Equipment ............................................................ Lighting ................................................................ Workspace ............................................................ Sensitive Electronic Equipment .......................... Pipe Organs .......................................................... 70- 512 70- 514 70- 515 70- 516 70- 516 70- 517 70- 519 70- 520 70- 520 70- 521 70- 521 70- 521 70- 521 70- 523 70- 525 70- 527 70- 528 70- 528 70- 530 70- 530 70- 530 70- 531 70- 531 70- 531 70- 532 70- 532 70- 535 70- 535 70- 535 70- 536 70- 537 70- 539 70- 540 70- 540 70- 540 70- 541 70- 541 70- 542 70- 542 70- 544 70- 545 70- 546 70- 549 70- 549 70- 552 70- 552 70- 553 70- 553 70- 554 660 Part I. Part II. Part Ill. Part IV. 665 Part I. Part II. 668 669 670 675 Part I. Part II. 680 Part I. Part II. Part III. Part IV. Part V. Part VI. Part VII. Part VIII. 682 Part I. Part II. Part Ill. 685 Part I. Part II. 690 Part I. Part II. Part Ill. Part IV. Part V. Part VI. Part VII. Part VIII. 691 692 Part I. Part II. Part 111. Part IV. Part V. Part VI. Part VII. 694 Part I. Part II. Part Ill. Part IV. Part V. Part VI. Part VII. 695 700 Part I. Part II. X-Ray Equipment ................................................. 70- 555 General ................................................................. 70- 555 Control ................................................................. 70- 556 Transformers and Capacitors .............................. Guarding and Grounding ................................... Induction and Dielectric Heating Equipment ... General ................................................................. Guarding, Grounding, and Labeling .................. Electrolytic Cells ................................................... Electroplating ....................................................... Industrial Machinery ........................................... Electrically Driven or Controlled Irrigation Machines ............................................................... General ................................................................. Center Pivot Irrigation Machines ........................ Swiinming Pools, Fountains, and Similar Installations .......................................................... General ................................................................. Permanently Installed Pools ................................ Storable Pools, Storable Spas, Storable Hot Tubs, and Storable Immersion Pools ................. Spas, Hot Tubs, and Permanently Installed Immersion Pools .................................................. Fountains .......................................... ................... Pools and Tubs for Therapeutic Use .................. Hyclromassage Bathtubs ...................................... Electrically Powered Pool Lifts ............................ Natural and Artificially Macie Bodies of Water .. General ................................................................. Installation ............................................................ Grounding and Bonding ..................................... Integrated Electr ical Systems .............................. General ................................................................. Orderly Shutdown ................................................ Solar Photovoltaic (PV) Systems ... ..................... General ................................................................. Circuit Requirements ........................................ Disconnecting Means ........................................... Wiring Methods and Materials ............................ Grounding and Bonding ..................................... Marking ................................................................ Connection to Other Sources .............. Energy Storage Systems ....................................... 1:,arge-Scale Photovoltaic (PV) Electric Supply Stauons ................................................. Fuel Cell Systems .................................................. General ................................................................. Circuit Requirements .......................................... Disconnecting Means ........................................... Wiring Methods ................................................... Grounding ............................................................ Marking ................................................................ Connection to Other Circuits ............................. Wind Electric Systems .......................................... General ................................................................. Circuit Requirements ......................................... Disconnecting Means ........................................... Wiring Methods ................................................... Grounding and Bonding ..................................... Marking ................................................................ Connection to Other Sources ............................. Fire Pumps ............................................................ Chapter 7 Special Conditions 70- 556 70- 557 70- 557 70- 557 70- 558 70- 558 70- 560 70- 561 70- 562 70- 562 70- 564 70- 564 70- 564 70- 567 70- 573 70- 574 70- 576 70- 578 70- 578 70- 579 70- 579 70- 579 70- 580 70- 580 70- 581 70- 581 70- 582 70- 582 70- 582 70- 583 70- 587 70- 588 70- 590 70- 592 70- 592 70- 592 70- 593 70- 594 70- 594 70- 594 70- 595 70- 595 70- 595 70- 595 70- 595 70- 596 70- 596 70- 597 70- 597 70- 599 70- 599 70- 599 70- 599 70- 600 Emergency Systems .............................................. 70- 605 General ................................................................. 70- 605 Circuit Wiring ....................................................... 70- 607 NATIONAL ELECTRICAL CODE 2020 Edition
CONTENTS Part III. Part IV. Part V. Part VI. 701 Part I. Part II. Part III. Part IV. 702 Part I. Part II. 705 Part I. Part II. 706 Part I. Part II. Part III. Part IV. Part V. Part VI. 708 Part I. Part II. Part III. Part IV. Part V. 710 712 Part I. Part II. Part Ill. Part IV. Part V. Part VI. Part Vil. 720 725 Part I. Part II. Part III. Part IV. 727 728 750 760 Part I. Part II. Part III. Part IV. 770 Part I. Part II. Part III. Part IV. Part V. Part VI. 800 Sources of Power .................................................. 70- 608 Emergency System Circuits for Lighting and Power .................................................................... 70- 610 Control -Emergency Lighting Circuits ............ 70- 610 Overcurrent Protection ....................................... 70- 611 Legally Required Standby Systems ...............,...... 70- 612 General ................................................................. 70- 612 CircuitWiring ....................................................... 70- 613 Sources of Power .................................................. 70- 613 Overcurrent Protection ...................................... 70- 614 Optional Standby Systems ................................... 70- 615 General ................................................................. 70- 615 Wiring ................................................................... 70- 616 Interconnected Electric Power ProduCLion Sources .................................................................. 70- 616 General ................................................................. 70- 616 Microgrid Systerns ................................................ 70- 620 Energy Storage Systems ....................................... 70- 621 General ................................................................. 70- 621 Disconnecting Means ........................................... 70- 621 Installation Requirements............. ..................... 70- 622 CircuitRequirements .......................................... 70- 623 Flow BatteryEnergy Storage Systems .................. 70- 624 Other Energy Storage Technologies ................... 70- 624 Critical Operations Power Systems (COPS) ....... 70- 624 General ................................................................. 70- 624 Circuit Wiring and Equipment ........................... 70- 625 Power Sources and Connection .......................... 70- 627 Overcurrent Protection ........ .............................. 70- 628 System Performance and Analysis ....................... 70- 629 Stand-Alone Systems ............................................ 70- 629 Direct Current Microgrids ................................... 70- 630 General ................................................................. 70- 630 Circuit Requirements ..................................... 70- 630 Disconnecting Means ........................................... 70- 631 Wiring Methods ................................................... 70- 631 Marking ................................................................ 70- 631 Protection ............................................................. 70- 631 Systems over 1000 Volts ................................. ...... 70- 631 Circuits and Equipment Operating at Less Than 50 Volts....................................................... 70- 631 Class I, Class 2, and Class 3 Remote-Contr ol, Signaling, and Power-Limited Circuits............... 70- 632 General ................................................................. 70- 632 Class I Circuits .... ............................. .................. 70- 633 Class 2 and Class 3 Circuits .................................. 70- 635 Listing Requirements ........................................... 70- 642 Instrumentation Tray Cable: Type ITC .............. 70- 644 Fire-Resistive Cable Systems ................................ 70- 645 Energy Management Systems .............................. 70- 645 Fire Alarm Systems ............................................... 70- 646 General ................................................................. 70- 646 Non-Power-Limited Fire Alarm (NPLFA) Circuits .................................................................. 70- 647 Power-Limited Fire Alarm (PLFA) Circuits ........ 70- 649 Listing Requirements ........................................... 70- 652 Optical Fiber Cables ............................................ 70- 656 General ............... ................................................. 70- 656 Cables Outside and Entering Buildings ............. 70- 656 Protection ............................................................. 70- 657 Grounding Methods ............................................ 70- 657 Installation Methods Within Buildings ............... 70- 659 Listing Requirements ........................................... 70- 661 Chapter 8 Communications Systems Gen eral Requfrements for Co rnmunications Systems .................................................................. 70- 664 2020 Edition NATIONAL ELECTRICALCODE Part I. PartII. PartIll. PartIV. Part V. 805 Part I. PartII. Part Ill. PartIV. Part V. 810 Part I. PartII. PartIll. PartIV. 820 Part I. Part II. Part Ill. PartIV. Part V. Part VI. 830 Part I. PartII. Part Ill. PartIV. Part V. Part VI. 840 2 4 Part I. PartII. Part Ill. PartIV. Part V. Part VI. Part Vil. 5 5A 8 9 IO ll(A) General ................................................................. 70- 664 Wires and Cables Outside and Entering Buildings ............................................................... Grounding Methods ............................................ Installation Methods Within Buildings ........ Listing Reqttirements ........................................... Comrnunications Circuits .................................... General ................................................................. Wires and Cables Outside and Entering Buildings ............................................................... Protection ............................................................. Installation Methods Within Buildings ............... Listing Requirements ........................................... Radio and Television Equipment ........................ General ................................................................. Receiving Eqttipment-Antenna Systems ........ Amateur and Citizen Band Transmitting and Receiving Stations -Antenna Systems .............. Interior Installation -Transmitting Stations .... Community Antenna Television and Radio Distribution Systems ............................................ General ................................................................. Coa.xial Cables Outside and Entering Buildings Protection ............................................................. Grounding Methods ............................................ Installation Methods Within Buildings ............... Listing Requirements ........................................... Network-Powered Broadband Communications Systems .................................................................. General ................................................................. Cables Outs ide and Entering Buildings ............. Protection ............................................................. Grounding Methods ............................................ Installation Methods Within Buildings ........ Listing Reqttirements ........................................... Premises-Powered Broadband Communications Systems .................................................................. General ................................................................. Cables Outside and Entering Buildings ............. Protection ............................................................. Grounding Methods ............................................ Installation Methods Within Buildings ............... Premises Powering ofCommunications Equipment over Communications Cables .......... Listing Reqttirements ........................................... Chapter 9 Tables Percent of Cross Section of Conduit and 70- 665 70- 666 70- 668 70- 675 70- 675 70- 675 70- 676 70- 676 70- 678 70- 679 70- 680 70- 680 70- 681 70- 683 70- 683 70- 684 70- 684 70- 684 70- 684 70- 685 70- 685 70- 686 70- 686 70- 686 70- 687 70- 688 70- 690 70- 690 70- 691 70- 691 70- 691 70- 692 70- 692 70- 693 70- 693 70- 693 70- 693 Tubing for Conductors and Cables ..................... 70- 695 Radius of Conduit and Tubing Bends ................ 70- 695 Dimensions and Percent Area of Conduit and Tubing (Areas of Conduit or Tubing for the Combinations ofWires Permitted in Table I, Chapter 9) ............................................................ 70- 696 Dimensions ofInsulated Conductors and Fixture Wires ........................................................ 70- 700 Compact Copper and Aluminum Building Wire Nominal Dimensions** and Areas ...................... 70- 704 Conductor Properties .......................................... 70- 705 Alternating-Current Resistance and Reactance for 600-Volt Cables, 3-Phase, 60 Hz, 75° C (l67° F) -Three Single Conductors in Conduit ................................................................. 70- 706 Conductor Stranding ..................... ..................... 70- 707 Class 2 and Class 3 Alternating-Current Power Source Limitations ....................... ....................... 70- 707 70-7
12(A) NAT IONAL ELEC TRICAL CODE PLFA Alternating-Current Power Source Limitations ...................................................... Informative Annex A: Product Safety Standards .... Informative Annex B: Application Information for 70- 709 70- 7IO Ampacity Calculation ..................................................... 70- 716 Informative Annex C: Conduit, Tubing, and Cable Tray Fill Tables for Conductors and Fixture Wires of the Same Size ................................................................. 70- 729 Informative Annex D: Examples .... .............................. 70- 815 Informative Annex E: Types of Construction ............... 70- 829 Informative Annex F: Availability andReliability for Critical Operations Power Systems; and Development and Implementation of Functional Performance Tests (FITs) for Critical Operations Power Systems .............. 70- 831 Informative Annex G: Supervisory Control and Data Acquisition (SCADA) ..................................................... 70- 833 Informative Annex H: Administration and Enforcement ................................................. ................. 70- 834 Informative Annex I: Recommended Tightening Torque Tables from UL Standard 486A-486B .......... 70- 840 Informative Annexj: ADA Standards for Accessible Design ............................................................................. 70- 842 Index ............................................................................... 70- 845 70--8 NATIONAL ELECTRICAL CODE 2020 Edition
CONTENTS 445 450 PartI. PartII. PartI ll. 455 PartI. PartII. 460 PartI. PartII. 470 Part I. Part II. 480 490 Part I. Part II. Part I ll. Part IV. Part V. 500 501 Pan I. PartII. PartI ll. 502 PartI. Pan II. PartI ll. 503 Pan I. PartII. PartI ll. 504 505 506 510 511 513 514 515 516 PartI. PartII. PartI ll. PartIV. PartV. 517 Pan I. PartII. PartI ll. Pan IV. Pan V. Generators............................................................ 70- 340 Transformers and TransformerVaults (I ncluding Secondary Ties) ................................ 70- 342 GeneralProvisions............................................... 70- 342 SpecificProvisionsApplicable to Different Types of Transformers......................................... 70- 346 TransformerVaults............................................... 70- 348 PhaseConverters.................................................. 70- 349 General................................................................. 70- 349 SpecificProvisionsApplicable to Different Types of PhaseConverters................................... 70- 350 Capacitors............................................................. 70- 350 1000Volts, Nominal, and Under........................ 70- 350 Over 1000Volts, Nominal.................................... 70- 351 Resistors andReactors......................................... 70- 352 1000Volts, Nominal, and Under........................ 70- 352 Over 1000Volts, Nominal.................................... 70- 352 Storage Batteries.................................................. 70- 352 Equipment Over 1000Volts, Nominal................ 70- 355 General................................................................. 70- 355 Equipment- SpecificProvisions....................... 70- 355 Equipment- Switchgear andI ndustrial ControlAssemblies.............................................. 70- 357 Mobile and Portable Equipment........................ 70- 359 Electrode-TypeBoilers......................................... 70- 360 Chapter 5 Special Occupancies Hazardous (Classified) Locations, Clas sesI , II , andI ll, Divisions I and 2..................................... ClassI Locations......................................... General................................................................. Wiring............... ............................. ..................... Equipment......................................... ,.................. Class II Locations ................................................. General............... ................................................. Wiring................................................................... Equipment............................................................ ClassI ll Locations................................................ General................................................................. Wiring............... ............................. ..................... Equipment............................................................ I ntrinsically Safe Systems..................................... Zone 0, I, and 2Locations. ................................ Zone 20, 21, and 22Locations forCombustible Dusts or lgnitible Fibers/Flyings......................... Hazardous (Classified) Locations- Specific.... Commercial Garages, Repair and Storage......... Aircraft Hangars ................ .................................. Motor FuelDispensing Facilities........ Bulk Storage Plants ....................................... SprayApplication, Dipping, Coating, and Printing Processes Using Flammable or 70- 361 70- 368 70- 368 70- 368 70- 373 70- 377 70- 377 70- 378 70- 380 70- 383 70- 383 70- 383 70- 384 70- 386 70- 388 70- 402 70- 408 70- 409 70- 411 70- 414 70- 420 Combustible Materials......................................... 70- 423 General................................................................. 70- 423 OpenContainers.................................................. 70- 424 SprayApplication Processes................................ 70- 424 SprayApplication Operations in Membrane Enclosures............................................................ 70- 431 Printing, Dipping, andCoating Processes.......... 70- 432 HealthCare Facilities........................................... 70- 434 General................................................................. 70- 434 Wiring and Protection......................................... 70- 437 Essential Electrical System ( EES) ........................ 70- 440 I nhalationAnesthetizing Locations.................... 70- 447 X-RayI nstallations............................................... 70- 449 2020 Edition NATIONAL ELECTRICAL CODE PanV I. PartV II. 518 520 PartI. PartII. PartI ll. PartIV . Part/. PartVI. PartV II. 522 PartI. PartII. Part111. 525 PartI. PartII. PartI ll. PartIV. 530 PartI. PartII. PartI ll . PartIV . Part/. PartV I. 540 PartI. PartII. Part 111. PartIV . 545 PartI. PartII. 547 550 PartI. PartII. PartI ll . 551 PartI. PartII. PartI ll . PartIV. Part/. PartV I. 552 PartI. PartII. PartI ll. PartIV . PartV . Communications, Signaling Systems, Data Systems, FireAlarm Systems, and Systems Less Than 120Volts, Nominal..................................... 70- 450 IsolatedPowerSystems........................................ 70- 451 Assembly Occupancies.................................. 70- 452 Theaters, Audience Areas of Motion Picture and Television Studios, PerformanceAreas, and SimilarLocations................................................. 70- 453 General................................................................. 70- 453 Fixed Stage Switchboards.................................... 70- 454 Fixed Stage Equipment Other T han Switchboards........................................................ 70- 455 Portable Switchboards on Stage.......................... 70- 457 Portable Stage Equipment Other Than Switchboards........................................................ 70- 459 DressingRooms, DressingAreas, and Makeup Areas. .................................................................... 70- 460 EquipmentGroundingConductor..................... 70- 460 Control Systems for Permanent Amusement Attractions............................................................ 70- 461 General................................................................. 70- 461 ControlCircuits.................................................... 70- 461 ControlCircuitWiring Methods......................... 70- 461 Carnivals,Circuses, Fairs, and Similar Events.... 70- 462 GeneralRequirements......................................... 70- 462 Power Sources...................................................... 70- 463 WiringMethods................................................... 70- 463 EquipmentGrounding and Bonding................. 70- 464 MotionPicture and Television Studios and SimilarLocations................................................. 70- 464 General................................................................. 70- 464 Stage or Set........................................................... 70- 465 DressingRooms.................................................... 70- 467 Viewing, Cutting, and Patching Tables............... 70- 467 Cellulose Niu·ate Film StorageVaults................. 70- 467 Substations............................................................ 70- 467 MotionPictureProjectionRooms...................... 70- 467 General................................................................. 70- 467 Equipment andProjectors of theProfessional Type....................................................................... 70- 467 NonprofessionalProjectors................................. 70- 468 Audio SignalProcessing, Amplification, and Reproduction Equipment................................... 70- 468 ManufacturedBuildings andRelocatable Structures............................................................. 70- 468 General................................................................. 70- 468 Relocatable Structures......................................... 70- 469 AgriculturalBuildings.......................................... 70- 470 MobileI-Jomes, ManufacturedI-Jomes, and MobileI-Jome Parks............................................. 70- 472 General................................................................. 70- 472 Mobile andManufacturedI-Jomes...................... 70- 473 Services and Feeders............................................ 70- 479 RecreationalVehicles andRecreationalVehicle Parks...................................................................... General................................................................. Combination Electrical Systems.......................... Other Power Sources........... ..................... Nominal 120.Volt or 120/240-Volt Systems........ Factory Tests......................................................... RecreationalVehicleParks ................ ,................. Park Trailers......................................................... General................................................................. Low-VoltageSystems............................................ Combination Electrical Systems.......................... Nominal 120.Volt or 120/240-Volt Systems........ Factory Tests......................................................... 70- 480 70- 480 70- 481 70- 482 70- 483 70- 489 70- 489 70- 491 70- 491 70- 492 70- 493 70- 493 70- 500 70-5
NATIONAL ELECTRICAL CODE Code-Making Panel No. 1 Articles 90, 100, 110, Chapter 9, Table I0, Annex A, Annex H, Annex I, and AnnexJ Kenneth P. Boyce, Chair UL LLC, IL[RT] Louis A. Barrios, Shell Global Solutions, TX [U] Rep. American Chemistry Council Roland E. Deike,Jr.,CenterPoint Energy,Inc., TX [UT] Rep. Electric Light & Power Group/EEi Ernest]. Gallo, Telcordia Technologies (Ericsson), NJ[U] Rep. Alliance for TelecommunicationsIndustry Solutions Palmer L. Hickman, Electr ical Training Alliance, MD [L] Rep.International BrotJ1erhood of Electrical Workers David L. Hittinger,Independent Electrical Contractors of Greater Cincinnati, OH [IM] Rep.Independent Electr ical Contractors, Inc. James E.Brw,ssen, Telcordia Technologies (Ericsson), NJ [U] (Alt. to ErnestJ. Gallo) Mark Christian, Electrical Training Alliance, TN [L] (Alt. to Palmer L. Hickman) Jon Coulimore,JC Electric,Inc., WA[IM] (Alt. to David L. Hittinger) Timothy Garland, Keene State College, NH [U] (Voting Alt.) Larry Geyer, Quality Electric Inc.,ID[IM] (Alt. to HarryJ. Sassaman) Joseph Marquardt,ExxonMobil Production Company, TX [U] (Alt. to Louis A. Barrios) Roger D. McDaniel, Georgia Power Company, GA[UT] (Alt. to Roland E. Deike,Jr.) Ark Tsisserev, AES Engineering, Canada [SE] Rep. CSA/Canadian Electrical Code Committee 70-10 Donald R. Iverson, National Electrical Manufacturers Association, MI[M] Rep. National Electrical Manufacnirers Association James F. Pierce,Intenek Testing Services, OR [RT] HarryJ. Sassaman, Forest Electric Corporation, NJ [IM] Rep. National Electrical Contr actors Association Kent A. Sayler, P2SInc., CA [U] Rep. Institute ofElectrical & Electronics Engineers, Inc. Mohinder P. Sood,City ofAlexandria, VA[E] Rep. International Association of Electrical Inspectors Alternates Kenneth L. McKinney,Jr., UL LLC, NC[RT] (Alt. to KennetJ1 P. Boyce) Donald R. Offerdahl, lntenek Testing Services, ND[RT] (Alt. toJames F. Pierce) Michael C. Stone, National Electrical Manufacturers Association, CA[MJ (AIL to Donald R.Iverson) Frank E. Tyler, The DuPont Company, Inc., DE[U] (AIL to Kent A. Sayler) Charles Valaer, City Of Glendale California, CA [E] (Alt. to Mohinder P. Sood) Nonvoting NATIONAL ELECTRICAL CODE 2020 Edition
COMMITTEE PERSONNEL Code-Making Panel No. 2 Articles 210, 220, Annex D, Examples DI through D6 Mark R. Hilbert, Chair MR Hilbert Electrical Inspections & Training, NH [El Rep. International Association of Electrical Inspectors Mathher Abbassi,New York City Department Of Buildings, NY [El Charles L. Boynton, The DuPont Company, Inc., TX [U] Rep. American Chemistr y Council Daniel Buuck, NationalAssociation of Home Builders (NAHB), DC [U] Rep. National Association of Home Builders Steve Campolo, Leviton Manufacturing Company, Inc., NY [Ml Thomas A. Domitrovich, Eaton Corporation, MO [M] Rep. National Electrical Manufacturers Association Nehad El-Sherif,Saskatoon, SKCanada [U] Rep. Institute of Electrical & Elecu·onics Engineers, Inc. Thomas L. Harman, University of Houston-Clear Lake, TX [SE] David W.Johnson, CenTex IEC, TX [IM] Rep. Independent Electrical Contractors, Inc. Alan Manche, Schneider Elecu-ic, KY [Ml John McCamish, NECA !BEW Elecu-ical Training Cemer, OR [L] Rep. International Brotherhood of Electrical Workers ChristopherJ. Pavese, Duke Energy, KY [UT] Rep. Elecu-ic Light & Power Group/EEi Frederick P. Reyes, UL LLC, NY [RT] Michael Weaver, M&W Electric, OR [IM] Rep. National Electrical Contractors Association Alternates William B. Crist,Jr., IES Residential Inc., TX [IM] (AIL LO David W.Johnson) Andrew Kriegman, Leviton Manufacturing Company, Inc., NY [M] (Alt. to Steve Campolo) Brett Larson, Schneider Electric, IA [M] (AIL LO Alan Manche) Cesar Lujan, National Association of Home Builders (NAH.B), DC [U] (AIL LO Daniel Buuck) Roger D. McDaniel, Georgia Power Company, GA [UT] (Alt. to Christopher]. Pavese) Daniel].Naughton,JATC of Greater Boston, !VIA [L] (AIL toJohn McCamish) Fred Neubauer, Neubauer Electric Inc., CA [IM] (AIL to Michael Weaver) Robert D. Osborne, UL LLC, NC [RT] (Alt. to Frederick P. Reyes) Fernando E. Pacheco, MetJrnnex Chile SA, TX [U] (AIL Lo Charles L. Boymon) Brian E. Rock, Hubbell Incorporated, CT [M] (AIL Lo Thomas A. Domiu-ovich) Joseph]. Wages,Jr., International Association of Electrical Inspectors, TX [E] (AIL to Mark R. Hilbert) Nonvoting Douglas A. Lee, U.S. Consumer Product Safety Commission, MD [CJ Andrew M. Trotta, U.S. Consumer Product Safety Commission, MD [CJ Rep. U.S. Consumer Product Safety Commission Rep. U.S. Consumer Product Safety Commission 2020 Edition NATIONAL ELECTRICAL CODE 70-11
NAT IONAL ELECTRICAL CODE Code-Making Panel No. 3 Articles 300,590,720,725,727,728,760,and Chapter 9,Tables ll(A) and (B),and Tables 12(A) and (B) Robert A.Jones, Chair Independent Elecu-ical Conu-actors, Inc., TX [IM] Rep. Independent EleCLrical Contractors, Inc. Richard S. Anderson, RTKL Associates Inc., VA[Ml Rep. Building Industry Consulting Services International Douglas P. Bassett, XFinity Home, FL [IM] Rep. EleCLronic Security Association Larry G. Brewer, lntertek Testing Services, NC [RT] Steven D. Burlison, Duke Energy, FL [UT] Rep. EleCLric Light & Power Group/EEi Paulj. Casparro, Scranton Elecu-iciansJAT C, PA [L] Rep. International Brotherhood of Electrical Workers Shane M. Clary, Bay Alarm Company, CA[Ml Rep. Automatic Fire Alarm Association, Inc. Raymond W. Horner, Allied Tube & Conduit, IL [M] Rep. National Elecu-ical Manufacturers Association Adam D. Corbin, Corbin Elecu-ical Services, Inc., NJ [IM] (Alt. to Robert A.Jones) Michael]. Farrell Ill, Lucas County Building Regulation, MI[L] (AIL LO PaulJ. Casparro) Joel Goergen, Cisco Systems, Inc., CA[Ml (Alt. to Chad M.Jones) WardJudson, Pentair/ERICO International Corporation, OH[M] (Alt. to Richard S. Anderson) Kyle Krueger, NationalElectrical Contractors- Milwaukee Chapter, Wl[IM] (VotingAlt.) John Lupacchino, Gaylor Elecu-ic Incorporated, IN [IM] (Alt. to Steven J. Owen) Jack McNamara, Bosch Security Systems, NY [M] (Alt. to Shane M. Clary) Timothy J. Mikloiche, Town of West Hartford, CT [E] (Alt. to Charles]. Palmieri) Edward C. Lawry, Oregon, WI [E] ( Member Emeritus) 70-12 Randolph]. Ivans, UL LLC, NY [RT] Chad M.Jones, Cisco Systems, OH [Ml T. David Mills, T. David Mills Associates, LLC, GA [U] Rep. Institute of Elecu-ical & EleCLronics Engineers, Inc. Steven]. Owen, StevenJ. Owen, Inc., AL[IM] Rep. Associated Builders & Contractors David A. Pace, Olin Corporation, AL [U] Rep. American Chemistry Council Charles]. Palmieri, Town of Norwell, MA [E] Rep. InternationalAssociation of Elecu-ical Inspectors John E. Sleights, Travelers Insurance Company, CT [I] George Allan Zimmerman, CME Consulting, Inc., CA[SE] Rep. Ethernet Alliance Alternates Mark C. Ode, UL LLC, AZ [RT] (Alt. to Randolph J. Ivans) ChristopherJ. Pavese, Duke Energ y, KY [UT] (Alt. to Steven D. Burlison) Dmitriy V. Plotnikov, lntertek Testing Services, NJ[RT] (Alt. to Larry G. Brewer) Rick D. Sheets, AT&T Digital Life, TX[IM] (Alt. to Douglas P. Bassett) George A. Straniero, AFC Cable Systems, Inc., NJ [M) (Alt. to Raymond W. Horner) William C. Szeto, McKinney, TX [U] (Alt. to T. David Mills) Rebecca S. Templet, Shell Chemical, LA[U] (Alt. to Da,;d A. Pace) Nonvoting NATIONAL ELECTRICAL CODE 2020 Edition
COMMITTEE PERSONNEL Code-Making Panel No. 4 Articles 690, 692, 694, 705 JamesJ. Rogers, Chair Towns of Oak Bluffs, Tisbury, West Tisbury, MA [El Rep. Imernational Association of Electrical Inspectors William F. Brooks, Brooks Engineering, CA [U] Rep. Photovoltaic Industry CodeCouncil Bill Brown, Schneider Electric, TN [M] Rep. National Electrical Manufacturers Association Thomas E. Buchal, Intertek Testing Services, NY [RT] James G. Cialdea, CE Power Engineered Se,vices, LLC, MA [IM] Rep. ImerNational Electrical Testing Association Timothy M. Croushore, FirstEnergy Technologies, PA [UT ] Rep. Electric Light & Power Group/EEi Jason M. Fisher, TeslaInc., VA [U] Rep. Solar Energy Industries Association Todd Fries, HellermannTyton, WI [M) Mark D. Gibbs, URSJCH2M Oak Ridge LLC (UCOR), TN [U) Rep. Institute of Electrical & Electronics Engineers, Inc. Rebekah Wharton Hren, IPPNC LLC, NC [U) Rep. Solar Energy Imernational John S. Berdner, Solarcowboyz, CA [U) (Alt. to William F. Brooks) Ron Borowski, Eaton Corporation, WI [M) (Alt. LO Bill Brown) Ward I. Bower, Solar Energy l ndusu·ies Association, NM [U) (Alt. toJason M. fisher) Mark Gillespie, TMI Elecu·ic, OH [IM) (Alt. LO Duke W. Schamel) Anthony Granato, Manchester Fire Rescue EMS, CT [L) (Alt. to Matthew Paiss) Howard Liu, l ntertek Testing Se,vices, NY [RT) (AIL LO Thomas E. Buchal) Brian Mehalic, Winston-Salem, NC [U) (Alt. to Rebekah Wharton Hren) Stephen W. Douglas, QPS Evaluation Services Inc., Canada [SE) Rep. CSA/Canadian Electrical Code Committee 2020 Edition NATIONAL ELECTRICAL CODE Lee M. Kraemer, First Solar, OH [Ml Rep. Large-Scale Solar Association MatthewPais.s, SanJose Fire Department, CA [L) Rep. Imernational Association of Fire Fighters IrozeneIIPruitt, The DuPont Company, Inc., TX [U) Rep. American Chemistry Council Duke W. Schamel, Electrical Service Solutions, Inc., CA [IM] Rep. Independem Electrical Comractors, Inc. RonaldJ. Toomer, Toomer Electrical Company Inc., LA [IM) Rep. National Electrical Contractors Association Wendell R. Whistler, IBEW 1547, OR [L) Robert H. Wills, lntergrid, LLC, NH [U] Rep. American Wind Energy Association Timothy P. Zgonena, UL LLC, IL [RT) Alternates Harold C. Ohde, IBEW 134/ElectricalJoim Apprenticeship Training & Trust, LL [L) (AIL to Wendell R. Whistler) Isaac Opalinsky, Sunpower Corporation, MD [Ml (Alt. to Lee M. Kr aemer) Rhonda Parkhurst, City ofPalo Alto, CA [El (AIL toJamesJ. Rogers) Robert W. Preus, National Renewable Energy L�b, CO [U) (AlL to Robert H. Wills) Kent Whitfield, Underwriters Laboratories, CA [RT) (AIL to Timotl1y P. Zgonena) Leo Zieman, Florida Power & Light (Nextera Energy), FL [UT) (AIL to Timothy M. Croushore) Nonvoting 70-13
NAT IONAL ELECTRIC AL CODE Code-Making Panel No. 5 Articles 200, 250 Nathan Philips, Chair Integrated Electronic Systems, OR [IM] Rep. National ElectricalComraCLors Association Paul W. Abernathy, Encore Wire Corporation, TX[Ml Rep. The Aluminum Association, Inc. Joseph F. Andre, Steel Tube Institute, WA [M) Rep. Steel Tube Institute of North America Gary A. Beckstrand, Utah Electrical JATC, UT [L] Rep. International Brotherhood of Electrical Workers Trevor N. Bowmer, Telcordia (Ericsson), NJ [U) Rep. Alliance for Telecommunications Industry Solutions David Brender, Copper Development Association, Inc., NY[M] Rep. Copper Developmem Association Inc. Paul Dobrowsky, Innovative Technology Services, NY [U) Rep. American Chemistry Council David A. Gerstetter, UL LLC, IL [RT) Larry Albert, Stanley Black And Decker, MD [M] (Alt. toJoseph Harding) Derrick L. Atkins, Minneapolis Electrical.JATC, MN[L) (Alt. to Gary A. Beckstrand) Kenneth S. Crawford, Chemours Company, 'NV [U] (Alt. to Paul Dobrowsky) Joseph P. DeGregoria, UL LLC, NY [RT] (Alt. to David A. Gerstetter) Raymond Dunnigan, Imenek, NY [RT) (Alt. to Christine T. Porter) ErnestJ. Gallo, Telcordia Technologies (Ericsson), NJ [U] (Voting AIL) BobbyJ. Gray, Hoydar/Buck, Inc., WA[IM) (Alt. to Nathan Philips) Buster Grissett, Mississippi PowerCompany, MS [UT) (Alt. to Mike O'Meara) Robert A. Nelson, Canadian Standards Association, Canada [RT] 70-14 G. Scott Harding, F. B. Harding, Inc., MD [IM] Rep. Independent Electrical Contractors, Inc. JosephHarding, Power ToolInstitute, OH [Ml Daleep C. Mohla, DCM EleCLrical Consulting Services, Inc., T X [U) Rep. lnstinne ofElecu·ical & Electronics Engineers, Inc. Mike O'Meara, Arizona Public Se,vice Company, AZ [UT) Rep. Electric Light & Power Group/EEi William A. Pancake, III, CAP Government, FL [E) Rep. International Association of Electrical Inspectors Christine T. Porter, lmenek Testing Services, WA [RT) Nick Sasso, State of Wyoming, WY[El GregoryJ. Steinman, Thomas & Betts Corporation, TN[M) Rep. National Electrical Manufacturers Association Alternates Raymond W. Homer, Allied Tube & Conduit, IL [M) (Alt. to Joseph F. Andre) Ronald Lai, Burndy LLC, NH[M] (AIL to GregoryJ. Steinman) Karin Manfredi, AFC Cable Systems/Atkore, !VIA[M) (Alt. to Paul W. Abernathy) Richard M. O'Brien, IAEI, NV [E) (Alt. to William A. Pancake, Ill) Davidj. Picatti, Picatti Bros. Inc., DBA Industrial Service & Electric, WA[IM] (Alt. to G. Scott Harding) Phil Simmons, Simmons Electrical Se1vices, WA [Ml (Alt. to David Brender) Nonvoting NATIONAL ELECTRICAL CODE 2020 Edition
COMMITTEE PERSONNEL Code-Making Panel No. 6 Articles310,311,320,322,324,326,328,330,332,334,336,337,338,340,382,394,396,398,399,400,402, Chapter 9,Tables5 through 9,Annex Band Example D7 Susan Newman Scearce, Chair City of Humboldt, TN, TN [E) Rep. International Association ofElectrical Inspectors Todd Crisman,IBEW Local 22JATC, NE [L) Rep. International Brotherhood ofElectrical Workers Joseph W. Cross,Eastman Chemical Company, TN [U) Rep. American Chemistr y Council Dennis A. Nielsen, L�wrence Berkeley National Laboratory, CA [U] Rep. Institute of Electrical & Electronics Engineers, Inc. Timothy Earl,GBH International, MI [M) Rep. The Vinyl Institute Christel K. Hunter,Cerro Wire, NV [M) Rep. The Aluminum Association, Inc. Gerald W. Kent, Kent Electric & Plumbing Systems, TX [IM) Rep. Independent Electrical Contractors, Inc. Charles David Mercier, Southwire Company, GA [Ml Rep. National Electrical Manufacturers Association David Carroll,Florida Power And Light, FL [UT) (Alt. to Michael Thomas Porcaro) ChrisJ. Fahrenthold,Facility Solutions Group, TX [IM) (Alt. to Gerald W. Kent) Samuel B. Friedman,General Cable Corporation, RI [M) (AIL to Charles David Mercier) Hermanj. Hall,Austin, TX [Ml (Alt. to Timothy Earl) Samuel R. La Dart, City ofMemphis, TN [L] (Alt. to Todd Crisman) 2020 Edition NATIONAL ELECTRICAL CODE Michael Thomas Porearo, National Grid, MA [UT) Rep. Electric Light & Power Group/EEi Kenneth Riedl,lntertek Testing Se1vices, NY [RT] Rep. Intertek Testing Seivices Susan L. Stene,UL LLC, CA [RT) George A. Straniero,AFC Cable Systems, Inc., NJ [M) Rep. Copper Development Association Inc. Wesley L. Wheeler,National Electr ical Conu·actors Association, MD [IM) Rep. National Electrical Contractors Association Alter nates Kelly Lamp, Idaho Chapter NECA, ID [IM) (AIL to Wesley L. Wheeler) Borgia Noel, State of Wyoming Fire Marshal's Office, IN [El (AIL to Susan Newman Scearce) Kevin T. Porter,Encore Wire Corporation, TX [M) (AIL to Christel K. Hunter) Mario Xerri,UL LLC, NY [RT) (AIL to Susan L. Stene) Joseph S. Zimnoch,TI1e Okonite Company, NJ [M] (AIL to George A. Straniero) 70-15
NATIONAL ELECTRICAL CODE Code-Making Panel No. 7 Articles 545,547,550,551,552,553,555,604,675,and Annex D,Examples D11 and D12 L. Keith Lofland, Chair InternationalAssociation of Electrical Inspectors (IA EI), T X [El Rep. International Association of Electrical Inspectors Jorge L. Arocha, Florida Power & Light, FL [UT] Rep. Edison Electr ic Institute Joseph R. Chandler, Independent Electrical Contractors-Dallas, TX [IM] Rep. Independent Elecu·ical Contractors, Inc. Wade Elliott, Utility Services Group, Inc., WA [U] Rep. National Association of RV Parks & Campgrounds RobertJ. Fick, Alliant Energy, WI [U] Rep. American Society ofAgricultural & Biological Engineers Robert A. Garcia, Cavco Industries/Fleetwood Homes, Inc., AZ [M] Bruce A. Hopkins, Recreation Vehicle Industry Association, VA [M] Ryan Hyer, Testing Engineers International, UT [RT] Thomas R. L ichtenstein, UL LLC, IL [RT] Doug Mulvaney, Kampgrounds ofAmerica, Inc., MT [U] Clifford Norton, Bellingham Marine Utilities, FL [IM] Richard A. Paredes, LBEW Local 164JATC, NJ [L] Rep. International Brotherhood of Electr ical Workers Stephen G. Rood, Legrand North America, NY [Ml Rep. National Elect rical Manufacturers A�sociation Dave Watson, Southwire, GA [M] Rep. TheAluminum Assodation, Inc. Wesley L. Wheeler, National Electrical Contractors Association, MD [IM] Rep. National Electrical Contractors Association Michael L. Zieman, RADCO, CA [M] Rep. Manufactured Housing Institute Alternates Barry S. Bauman, Alliant Energy, WI [U] (Alt. to RobertJ. Fick) William Bruce Bowman, Fox Systems, Inc., GA [IM] (Alt. toJoseph R. Chandler) Byron Carroll, Carrol Woods Inc., NC [U] (Alt. to Wade Elliott) Gerald D. Dix, Hampton Roads Joint Apprenticeship Training Committee, VA [L] (Alt. to Richard A. Paredes) Dean C. Hunter, Minnesota Department of L�bor & Industry, MN [El (Alt. to L. Keith Lofland) 70-16 Jeffrey Kreidler, Kampgrounds ofAmerica Inc., MT [U] (Alt. to Doug Mulvaney) Mark C. Ode, UL LLC, AZ [RT] (AIL to Thomas R. Lichtenstein) Kent Perkins, Recreation Vehicle Industry Association, VA [Ml (Alt. to Bruce A. Hopkins) Pau!J. Reis, AFC Cable Systems, Inc., MA [M] (Alt. to Dave Watson) MatthewJ. Samojeden, Hubbell Incorporated, CT [M] (Alt. to Stephen G. Rood) NATIONAL ELECTRICAL CODE 2020 Edition
COMMITTEE PERSONNEL Code-Making Panel No. 8 Articles342,344,348,350,352,353,354,355,356,358,360,362,366,368,370,372,374,376,378,380,384,386, 388,390,392,Chapter 9,Tables1 through 4,Example D13,and Annex C Doug Adams, MP Husky LLC, SC [M) Larry D. Cogburn, Chair Cogburn Bros., Inc., FL [IM) Rep. National EleCLrical Contractors Association Richard E. Loyd, R & N Associates, AZ [M] Rep. Steel Tube Institute ofNorth America Rep. Cable Bus Manufacturers Association RichardJ. Berman, UL LLC, IL [RT) David M. Campbell, AFC Cable Systems, Inc., MA [M) Rep. The Aluminum Association, Inc. Michael C. Martin, ExxonMobil Research & Engineering, TX [U) Rep. American Chemistry Council Kenneth W. Hengst, 4C2 E lectrical Specialists, TX [IM) Rep. Independent Electrical Contractors, Inc. PeteJackson, City ofBakersfield, California, CA [El Rep. International Association ofElectrical Inspectors David H. Kendall, Thomas & Betts Corporation, TN [M) Rep. The Vinyl Institute Paul W. Myers, Nutrien, OH [U) Rep. Institute ofElectrical & Electronics Engineers, Inc. Donald R. Offerdahl, Intertek Testing Services, ND [RT) Rhett A. Roe, IBEW Local Union 26JATC, MD [L) Rep. International Brotherhood ofElectrical Workers Rodney J. West, Schneider Electric, OH [Ml Rep. National Electrical Manufacturers Association Alternates Jay Burris, Wheatland Tube (Div. ofZekelmanIndustries), OH [Ml (AIL to Richard E. Loyd) Joel (Joey) Crider, AEP, OH [UT) (Voting Alt.) Brian Deacy, Allied Tube Conduit Corporation, IL [Ml (Alt. to David H. Kendall) David A. Gerstetter, UL LLC, IL [RT) (Alt. LO RichardJ. Berman) J. Grant Hammett, Colorado State Elecu·ical Board, CO [E) (Alt. to PeteJackson) Gary K.Johnson, Dow Corning Corporation, LA [U) (Alt. to Michael C. Martin) Stephen P. Poholski, Newkirk Electric Associates, Inc., MI [IM) (AIL to Larry D. Cogburn) Dan Rodriguez, IBEW Local Union 332, CA [L) (AIL to Rhett A. Roe) Frederic F. Small, Hubbell Incorporated, CT [Ml (Alt. to RodneyJ. West) Dan Suriyamongkol, Advanced Cable Bus, SC [Ml (AIL to Doug Adams) Raul L. Vasquez, IndependentElectrical Contractors, TX [IM) (Alt. to Kenneth W. Hengst) Dave Watson, Southwire, GA [M) (Alt. to David M. Campbell) Nonvoting Stephen W. Douglas, QPS Evaluation Services Inc., Canada [SE) Rep. CSA/Canadian Electrical Code Committee 2020 Edition NATIONAL ELECTRICAL CODE 70-17
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NEC 2020.pdf

  • 1.
  • 2. m NFPJf Copyright© 2019 National Fire Protection Association® One Batterymarch Park Quincy, Massachusetts 02169-7471 NFPA, NFPA 70, NationalFire Protection Association, NationalEkctrical Code, and NEC are registeredu·ademarks of the National Fire Protection Association. IMPORTANT NOTICES AND DISCLAIMERS CONCERNING NFPA® STANDARDS NFPA® codes, standards, recommended practices, and guides ("NFPA Standards"), of which the document contained herein is one, are developed through a consensus standards development process approved by the AmericanNational Standards Institute. This process brings together volunteers representing varied viewpoints and interests to achieve consensus on fire and other safety issues. While theNFPA administers the process and establishes rules to promote fairness in the development of consensus, it does not independently test, evaluate, or verify the accuracy of any information or the soundness of anyjudgments contained inNFPA Standards. TheNFPA disclaims liability for any personal injury, property, or other damages of any nature whatsoever, whether special, indirect, consequential or compensatory, directly or indirectly resulting from tl1e publication, use of, or reliance on NFPA Standards. TheNFPA also makes no guaranty or warranty as to the accuracy or completeness of any information published herein. In issuing and making NFPA Standards available, theNFPA is not undertaking to render professional or other services for or on behalf of any person or entity.Nor is the NFPA undertaking to perfom1 any duty owed by any person or entity to someone else. Anyone using this document should rely on his or her own independent judgment or, as appropriate, seek the advice of a competent professional in determining the exercise of reasonable care in any given circumstances. TheNFPA has no power, nor does it undertake, to police or enforce compliance with the contenL� ofNFPA Standards.Nor does theNFPA list, certify, test, or inspect products, designs, or installations for compliance �tl1 this document. Any certification or other statement of compliance with the requirements of this document shall not be attributable to theNFPA and is solely the responsibility of tl1e certifier or maker of the statement. ��� See ALERT ...., ALERT: TIDS STANDARD HAS BEEN MODIFIED BY A TIA OR ERRATA Users ofNFPA codes, standards, recommended practices, and guides ("NFPA Standards") should be aware thatNFPA Standards may be amended fr om time to time through the issuance of a Tentative Interim Amendment (TIA) or corrected by Errata. An officialNFPA Standard at any point in time consists of the current edition of the document together with any TIAs and Errata then in effect. To determine whether anNFPA Standard has been amended through the issuance of TIAs or corrected by Errata, go to www.nfpa.org/docinfo to choose fr om the list ofNFPA Standards or use the search feature to select theNFPA Standard number (e.g.,NFPA 13). The document information page provides up-to-date document-specific information as well as postings of all existing TIAs and Errata. It also includes the option to register for an " Alert" feature to receive an automatic email notification when new updates and other information are posted regarding the document.
  • 3. IMPORTANT NOTICES AND DISCLAIMERS CONCERNING NFPA® STANDARDS Updating of NFPA Standards Users of NFPA codes, standards, recommended practices, and guides ("NFPA Standards") should be aware that these documents may be superseded at any time by the issuance of new editions or may be amended from time to time through the issuance of Tentative Interim Amendments or corrected by Errata. An official NFPA Standard at any point in time consists of the current edition of the document together with any Tentative Interim Amendments and any Errata then in effect. In order to determine whether a given document is the current edition and whether it has been amended through the issuance of Tentative Interim Amendments or corrected through the issuance of Errata, consult appropriate NFPA publications such as the National Fire Codes® Subscription Service, visit the NFPA website at www.nfpa.org, or contact the NFPA at the address listed below. Interpretations of NFPA Standards A statement, written or oral, that is not processed in accordance with Section 6 of the Regulations Governing the Development of NFPA Standards shall not be considered the official position of NFPA or any of its Committees and shall not be considered to be, nor be relied upon as, a Formal Interpretation. Patents The NFPA does not take any position with respect to the validity of any patent rights referenced in, related to, or asserted in connection with an NFPA Standard. The users of NFPA Standards bear the sole responsibility for determining the validity of any such patent rights, as well as the risk of infringement of such rights, and the NFPA disclaims liability for the infringement of any patent resulting from the use of or reliance on NFPA Standards. NFPA adheres to the policy of the American National Standards Institute (ANSI) regarding the inclusion of patents in American National Standards ("the ANSI Patent Policy"), and hereby gives the following notice pursuant to that policy: NOTICE: The user's attention is called to the possibility that compliance with an NFPA Standard may require use of an invention covered by patent rights. NFPA takes no position as to the validity of any such patent rights or as to whether such patent right5 constitute or include essential patent claims under the ANSI Patent Policy. If, in connection with the ANSI Patent Policy, a patent holder has filed a statement of willingness to grant licenses under these rights on reasonable and nondiscriminatory terms and conditions to applicants desiring to obtain such a license, copies of such filed statements can be obtained, on request, from NFPA. For further information, contact the NFPA at the address listed below. Law and Re g ulations Users of NFPA Standards should consult applicable federal, state, and local laws and regulations. NFPA does not, by the publication of its codes, standards, recommended practices, and guides, intend to urge action that is not in compliance with applicable laws, and these documents may not be consu·ued as doing so. Copyrights NFPA Standards are copyrighted. They are made available for a wide variety of both public and private uses. These include both use, by reference, in laws and regulations, and use in private self-regulation, standardization, and the promotion of safe practices and methods. By making these documents available for use and adoption by public authorities and private users, the NFPA does not waive any rights in copyright to these documents. Use of NFPA Standards for regulatory purposes should be accomplished through adoption by reference. The term "adoption by reference" means the citing of title, edition, and publishing information only. Any deletions, additions, and changes desired by the adopting authority should be noted separately in the adopting insu1.11nent. In order to assist NFPA in following the uses made of its documents, adopting authorities are requested to notify tl1e NFPA (Attention: Secretary, Standards Council) in writing of such use. For technical assistance and questions concerning adoption of NFPA Standards, contact NFPA at the address below. For Further Information All questions or other communications relating to NFPA Standards and all requests for information on NFPA procedures governing its codes and standards development process, including information on the procedures for requesting Formal Interpretations, for proposing Tentative Interim Amendments, and for proposing revisions to NFPA standards during regular revision cycles, should be sent to NFPA headquarters, addressed to the attention of the Secretary, Standards Council, NFPA, l Battery.march Park, P.O. Box 9101, Quincy, MA 02269-9101; email: stds_admin@nfpa.org For more information about NFPA, visit the NFPA website at www.nfpa.org. All NFPA codes and standards can be viewed at no cost at www.nfpa.org/docinfo.
  • 4. Copyright© 2019 National Fire Protection Association® . All Rights Rese1ved. NFPA 70® National Electrical Code ® 2020 Edition This edition of NFPA 70, NationalElectrical Code, was prepared by the National Electrical Code Committee and acted on by NFPA at itsJune Association Technical Meeting heldJune 17-20, 2019, in San Antonio, TX. It was issued by the Standards Council on August 5, 2019, with an effective date of August 25, 2019, and supersedes all previous editions. This Code was issued with Tentative Interim Amendments (TIAs) that impacted provisions in 210.52(C)(2), 240.67(C}, 240.87(C), 725.121(C}, and Annex D3. For more information on TIAs, see www.nfpa.org/70 and Section 5 of the Regulations Governingthe Development ofNFPA Standards available at www.nfpa.org/regs. This edition of NFPA 70was approved as an American National Standard on August 25, 2019. History and Development of the National Electrical Code® The National Fire Protection Association has acted as sponsor of the NationalElecl1ical Code since 1911. The original Code document was developed in 1897 as a result of the united efforts of various insurance, electrical, architectural, and allied interests. In accordance with the Regulations Governingthe Development ofNFPA Standards, a NationalElect1ical Code first draft report containing proposed amendments to the 2017 National fiectrical Code was published by NFPA inJuly 2018. This report recorded the actions of the various code-making panels and the correlating committee of the National Elecu·ical Code Committee on each public input and first revision that had been made to revise the 2017 Code. The report was published at www.nfpa.org/70. Following the close of the public comment period, the code-making panels met, acted on each comment, and created some second revisions, which were reported to the correlating committee. NFPA published the NationalElectrical Code second draft report in April 2019, which recorded the actions of the code-making panels and the correlating committee on each public comment on the National Electrical Code Committee first draft report. 111e Nationall!-,ectrical Code first draft report and the NationalElecl1ical Code second draft report were presented to the 2019June Association Technical Meeting for adoption. NFPA has an Electrical Section that provides par ticular opportunity for NFPA members interested in elecu-ical safety to become better in.formed and to contribute to the development of the National El.ectrical Code and other NFPA elecu·ical standards. At the Elecu·ical Section codes and standards review session held at the 2019 NFPA Conference and Expo, section members had the opportunity to discuss and review the report of the National Electrical Code Committee prior to the adoption of this edition of the Code by the association at its 2019June Technical Meeting. This 55th edition supersedes all other previous editions, supplements, and printings dated 1897, 1899, 1901, 1903, 1904, 1905, 1907, 1909, 1911, 1913, 1915, 1918, 1920, 1923, 1925, 1926, 1928, 1930, 1931, 1933, 1935, 1937, 1940, 1942, 1943, 1947, 1949, 1951, 1953, 1954, 1955, 1956, 1957, 1958, 1959, 1962, 1965, 1968, 1971, 1975, 1978, 1981, 1984, 1987, 1990, 1993, 1996, 1999, 2002, 2005, 2008, 2011, 2014, and 2017. This Code is purely advisory as far as NFPA is concerned. It is made available for a wide variety of both public and private uses in the interest of life and property protection. These include both use in law and for regulatory purposes and use in private self-regulation and standardization activities such as insurance underwriting, building and facilities construction and management, and product testing and certification. NFPA 70, National Electrical Code, NFPA and National Fire Protection Association are registered trademarks of the National Fire Protection Association, Quincy, Massachuseu.s 02169.
  • 5. NATIONAL ELEC TRIC AL CODE Contents 90 Introduction ......................................................... 70- 29 100 Part I. Part II. Part Ill. IIO Part I. Part II. Part Ill. Part IV. Part V. Chapter 1 General Definitions ............................................ General ................................................................. Over 1000 Volts, Nominal .................................... Hazardous (Classified) Locations (CMP-14). ... Requirements for Electrical Installations ........... General ................................................................. 1000 Volts, Nominal, or Less .............................. . Over 1 000 Volts, Nominal .................................... Tunnel Installations over IOOO Volts, Nominal . Manholes and Other Electrical Enclosures Intended for Personnel Entry ............................. Chapter 2 Wiring and Protection 200 Use and Identification ofGrounded 210 Part I. Part II. Part Ill. 215 220 Part I. Part II. Part Ill. Part IV. Part V. 225 Part I. Part II. Part Ill. 230 Part I. Part II. Part Ill. Part IV. Part V. Part VI. Part VII. Part VIII. 240 Part I. Part II. Part Ill. Part IV. Part V. Part VI. Part VII. Conductors ....................................................... Branch Circuits .................................................... General Provisions ............................................... Branch-Circuit Ratings ........................................ Required Outlets .................................................. feeders ..................................................... Branch-Circuit, feeder, and Service Load Calculations .......................................................... General ................................................................. Branch-Circuit Load Calculations ....................... feeder and Service Load Calculations ............... Optional feeder and Service Load Calculalions .......................................................... farm Load Calculations ....................................... Outside Branch Circuits and feeders ................. General ................................................................. Buildings or Other Str uctures Supplied b y a feeder(s) or Branch Circuit(s) ........................... Over I000 Volts. ................................................... Se,vices ................................................... General ................................................................. Overhead Service Conductors ............................. Underground Se1vice Conductors ...................... Service-Enu·ance Conductors .............................. Service Equipment - General ........................... Service Equipment- Disconnecting Means ..... Service Equipment- Overcurrent Protection .. Services Exceeding I 000 Volts, Nominal ............ Overcurrent Protection ....................................... General ................................................................. Location ................................................................ Enclosures ............................................................ Disconnecting and Guarding .............................. Plug fuses, fuseholders, and Adapters .............. Cartridge fuses and fuseholders ........................ Circuit Breakers ................................................... Part VIII. Supervised lndusu·ial Installations ...................... Part IX. Overcurrent Protection over IOOO Volts, 242 Part I. Part II. Part Ill. 250 Part I. Part II. 70-2 Nominal ................................................................ Overvoltage Protection ........................................ General ................................................................. Surge-Protective Devices (SPDs), 1000 Volts or Less ....................................................................... Surge Arresters, Over 1000 Volts ......................... Grounding and Bonding ..................................... General ................................................................. SystemGrounding ............................................... 70- 32 70- 32 70- 41 70- 42 70- 46 70- 46 70- 50 70- 52 70- 55 70- 56 70- 58 70- 60 70- 60 70- 65 70- 68 70- 71 70- 73 70- 73 70- 74 70- 76 70- 79 70- 81 70- 82 70- 82 70- 85 70- 86 70- 88 70- 88 70- 89 70- 90 70- 91 70- 93 70- 93 70- 95 70- 96 70- 97 70- 97 70- 101 70- l04 70- 104 70- 104 70- l04 70- 105 70- 107 70- 108 70- 109 70- 109 70- 109 70- 110 70- I l l 70- 111 70- 113 Part Ill. Part IV. Part V. Part VI. Part VII. Part VIII. Part IX. Part X. Grounding Electrode System and Grounding Electrode Conductor ........................................... 70- 120 Enclosure, Raceway, and Service Cable Connections ......................................................... 70- 125 Bonding ................................................................ 70- 125 Equipment Grounding and Equipment Grounding Conductors ....................................... 70- 129 Methods ofEquipment Grounding Conductor Connections ......................................................... 70- 133 Direct-Current Systems ........................................ 70- 135 Instruments, Meters, and Relays ......................... 70- 136 Grounding of Systems and Circuits ofover 1000 Volts ............................................................. 70- 137 Chapter 3 Wiring Methods and Materials 300 Part I. Part II. 310 Part I. Part II. Part III. 311 Part I. Part II. Part Ill. Part IV. 312 Part I. Part II. 314 Part I. Part II. Part 111. Part IV. 320 Part I. Part II. Part Ill. 322 Part I. Part II. Part III. 324 Part I. Part II. Part Ill. 326 Part I. Part II. Part III. 330 Part I. Part II. Part Ill. 332 Part I. Part II. General Requirements for Wiring Metl1ods and Materials ............................................................... 70- 140 General Requirements ......................................... 70- 140 Requirements forover IOOO Volts, Nominal ...... 70- 149 Conductors for General Wiring .......................... 70- 151 General ................................................................. 70- 151 Construction Specifications ................................ 70- 151 Installation ............................................................ 70- 156 Medium Voltage Conductors and Cable ............ 70- 165 General ................................................................. 70- 165 Construction Specifications ............................... 70- 165 Installation ............................................................ 70- 167 Ampacities ............................................................ 70- 168 Cabinets, Cutout Boxes, and Meter Socket Enclosures ............................................................ 70- 179 Scope and Installation ................... ..................... 70- 179 Consm1ction Specifications ................................ 70- 182 Outlet, Device, Pull, andJunction Boxes; Conduit Bodies; Fittings; and Handhole Enclosures ........................................................ Scope and General ............................................... Installation ............................................................ Constr uction Specifications ................................ Pull andJunction Boxes, Conduit Bodies, and Handhole Enclosures for Use on Systems over 1000 Volts, Nominal ............................................. Armored Cable: Type AC ..................................... General ................................................................. Installation ............................................................ Construction Specifications ................................ Flat Cable Assemblies: Type fC ........................... General ................................................................. Installation ............................................................ Construction Specifications ................................ Flat Conductor Cable: Type FCC ........................ General ................................................................. Installation ............................. .............................. Construction Specifications ................................ Integrated Gas Spacer Cable: Type IGS .............. General ................................................................. Installation ............................................................ Construction Specifications ................................ Metal-Clad Cable: Type MC ................................. General ................................................................. Installation ............................................................ Consu·uction Specifications ................................ Mineral-Insulated, Metal-Sheathed Cable: Type 70- 182 70- 182 70- 183 70- 189 70- 189 70- 190 70- 190 70- 190 70- 191 70- 191 70- 191 70- 192 70- 192 70- 192 70- 192 70- 193 70- 194 70- 194 70- 194 70- 194 70- 195 70- 195 70- 195 70- 195 70- 197 Ml .......................................................................... 70- 197 General ................................................................. 70- I97 Installation ............................................................ 70- 197 NATIONAL ELECTRICAL CODE 2020 Edition
  • 6. CONTENTS Part III. 334 Part I. Part II. Part III. 336 Part I. Part II. Part III. 337 Part I. Part II. Part III. 338 Part I. Part II. Part III. 340 Part I. Part II. Part III. 342 Part I. Part II. Part III. 344 Part I. Part II. Part III. 348 Part I. Part II. 350 Part I. Part II. Part III. 352 Part I. Part II. Part III. 353 Part I. Part II. Part III. 354 Part I. Part II. Part III. 355 Part I. Part II. Part III. 356 Part I. Part II. Part Ill. 358 Part I. Part II. Part III. Construction Specifications ................................ 70- 198 Nonmetallic-Sheathed Cable: Types NM and NMC ...................................................................... 70- 198 General ................................................................. 70- 198 Installation ............................................................ 70- 198 Construction Specifications ................................ Power and Control Tray Cable: Type TC ............ General ................................................................. Installation ............................................................ Construction Specifications ................................ Type P Cable ........................... ............................. General ................................................................. Installation ............................................................ Construction Specifications ................................ Service-Entrance Cable: Types SE and USE ....... General ................................................................. Installation ............................................................ Construuion Specifications ................................ Underground Feeder and Branch-Circuit 70- 200 70- 200 70- 200 70- 200 70- 201 70- 202 70- 202 70- 202 70- 202 70- 202 70- 202 70- 203 70- 203 Cable: Type UF ..................................................... 70- 204 General ........................................... ..................... 70- 204 Installation ............................................................ 70- 204 Construction Specifications ................................ 70- 204 Intermediate Metal Conduit: Type IMC ............. 70- 204 General ................................................................. 70- 204 Installation ............................................................ 70- 204 Construction Specifications ................................ 70- 206 Rigid Metal Conduit: Type RMC ......................... 70- 206 General ................................................................. 70- 206 Installation ............................................................ 70- 206 Construction Specifications ................................ 70- 207 Flexible Metal Conduit: Type FMC ..................... 70- 207 General ................................................................. 70- 207 Installation .......................... ................................. 70- 208 Liquidtight Flexible Metal Conduit: Type LFMC .................................................................... 70- 209 General ................................................................. 70- 209 Installation ............................................................ 70- 209 Construction Specifications ................................ 70- 210 Rigid Polyvinyl Chloride Conduit: Type PVC ..... 70- 210 General ................................................................. 70- 210 Installation ............................................................ 70- 2IO Construction Specifications ................................ 70- 212 High Density Polyethylene Conduit: Type HOPE Conduit ... ................................................. General ................................................................. Installation ............................................................ Construction Specifications ................................ Nonmetallic Underground Conduit with 70- 212 70- 212 70- 213 70- 213 Conductors: Type NUCC ..................................... 70- 213 General ................................................................. 70- 213 Installation ............................................................ 70- 214 Construction Specifications ................................ 70- 214 Reinforced T hermosetting Resin Conduit: Type RTRC ................... ................................................. General ................................................................. Installation ............................................................ Construction Specifications ........................... Liquidtight Flexible Nonmetallic Conduit: Type 70- 215 70- 215 70- 215 70- 216 LFNC ..................................................................... 70- 217 General ................................................................. 70- 217 Installation ............................................................ 70- 217 Construction Specifications ................................ 70- 218 Electrical Metallic Tubing: Type EMT ................ 70- 218 General ................................................................. 70- 218 Installation ............................................................ 70- 218 Construction Specifications ................................ 70- 219 2020 Edition NATIONAL ELECTRICAL CODE 360 Part I. Part II. Part Ill. 362 Part I. Part II. Part Ill. 366 Part I. Part II. Part 111. 368 Part I. Part II. Part 111. Part IV. 370 Part I. Part II. Part Ill. 372 Part I. Part II. 374 Part I. Part II. Part Ill. 376 Part I. Part II. Part Ill. 378 Part I. Part II. Part Ill. 380 Part I. Part II. 382 Part I. Part II. Part Ill. 384 Part I. Part II. Part Ill. 386 Part I. Part II. Part 111. 388 Pan I. Pan II. Part 111. 390 Pan I. Part II. 392 Pan I. Part II. Part Ill. 393 Part I. Pan II. Flexible Metallic Tubing: Type FMT ................... 70- 219 General ................................................................. 70- 219 Installation ............................................................ 70- 220 Construction Specifications ................................ 70- 220 Electrical Nonmetallic Tubing: Type ENT ......... 70- 220 General ................................................................. 70- 220 Installation ............................................................ 70- 22I Construction Specifications ................................ 70- 222 Arndliary Gutters .................................................. 70- 222 General ................................................................. 70- 222 Installation ............................................................ 70- 222 Consa-uction Specifications ................................ 70- 223 Busways ................................................................. 70- 224 General Requirements ......................................... 70- 224 Installation ............................................................ 70- 224 Construction ......................................................... 70- 225 Requirements for Over I000 Volts, Nominal ..... 70- 225 Cablebus ............................................................... 70- 226 General ................................................................. 70- 226 Installation ............................................................ 70- 226 Construction Specifications ................................ 70- 227 Cellular Concrete Floor Raceways ...................... 70- 227 General ................................................................. 70- 227 Installations .......................................................... 70- 227 Cellular Metal Floor Raceways ............................ 70- 228 General ................................................................. 70- 228 Installation ...................................................,........ 70- 228 Construction Specifications .......................... ...... 70- 229 Metal Wireways ..................................................... 70- 229 General ................................................................. 70- 229 Installation ............................................................ 70- 229 Construction Specifications .... ........................... 70- 230 Nonmetallic Wireways .......................................... 70- 230 General ................................ ................................ 70- 230 Installation ............................................................ 70- 230 Construction Specifications ................................ 70- 231 MultioutletAssembly ........................................... 70- 231 General ................................................................. 70- 231 Installation ............................................................ 70- 231 Nonmetallic Extensions ....................................... 70- 232 General ................................................................. 70- 232 Installation ............................................................ 70- 232 Construction Specifications (Concealable Nonmetallic Extensions Only) ............................ 70- 233 Sa-ut-Type Channel Raceway ............................... 70- 233 General ................................................................. 70- 233 Installation ............................................................ 70- 233 Consa-uction Specifications ................................ 70- 234 Surface Metal Raceways ....................................... 70- 234 General ................................................................. 70- 234 Installation ............................................................ 70- 234 Consm,ction Specifications ................................ 70- 235 Surface Nonmetallic Raceways ............................ 70- 235 General ................................................................. 70- 235 Installation ............................................................ 70- 235 Consu-t1ction Specifications ................................ 70- 236 Underfloor Raceways ........................................... 70- 236 General ................................................................. 70- 236 Installation ............................................................ 70- 236 Cable Trays ........................................................... 70- 237 General ................................................................. 70- 237 Installation ............................................................ 70- 237 Construction Specifications ................................ 70- 243 Low-Voltage Suspended Ceiling Power Distribution Systems ............................................ 70- 244 General ................................................................. 70- 244 Installation ............................................................ 70- 244 70-3
  • 7. Part Ill. 394 Part I. Part II. Part Ill. 396 Part I. Part II. 398 Part I. Part II. Part Ill. 399 400 Part I. Part II. Part Ill. 402 404 Part I. Part II. 406 408 Part I. Part II. Part Ill. Part IV. 409 Part I. Part fl Part Ill. 410 Part I. Part II. Part Ill. Part IV. Part V. Part VI. Part VII. Part VIII. Part IX. Part X. Part XI. Part XII. Part XIII. Part XIV. Part XV. Part XVI. 411 422 Part I. Part II. Part Ill. Part IV. Part V. 424 Part I. 70-4 NATIONAL ELECTRICAL CODE Construction Specifications ................................ 70- 245 Concealed Knol:>-and-Tube Wiring ..................... 70- 246 General ................................................................. 70- 246 Installation ............................................................ 70- 246 Construction Specifications ................................ 70- 246 Messenger-Supported Wiring .............................. 70- 247 General ................................................................. 70- 247 Installation ............................................................ 70- 247 Open Wiring on Insulators ................................. 70- 247 General ................................................................. 70- 247 Installation ............................................................ 70- 248 Construction Specifications ................................ 70- 249 Outdoor Overhead Conductors over I 000 Volts ............................................................. 70- 249 Chapter 4 Equipment for General Use Flexible Cords and Flexible Cables ..................... 70- 250 General ................................................................. 70- 250 Construction Specifications ................................ 70- 259 Portable Cables Over 600 Volts, Nominal .......... 70- 260 Fixture Wires ........................................................ 70- 260 Switches ................................................................ 70- 263 Installation ............................................................ 70- 263 Construction Specifications ................................ 70- 266 Receptacles, Cord Connectors, and Attachment Plugs (Caps) ......................................................... 70- 266 Switchboards, Switchgear, and Panelboards ...... 70- 271 General ................................................................. 70- 271 Switchboards and Switchgear .............................. 70- 273 Panelboards .......................................................... 70- 273 Construction Specifications ................................ 70- 274 Industrial Control Panels .................................... 70- 275 General ................................................................. 70- 275 Installation ............................................................ 70- 275 Construction Specifications ......................... 70- 276 Luminaires, L�mpholders, and L�mps ............... 70- 277 General .......................................................... 70- 277 Luminaire Locations ............................................ Provisions at Luminaire Outlet Boxes, Canopies, and Pans .............................................. Luminaire Supports ............................................. Grounding ............................................................ Wiring ofLuminaires ........................................... Construction of Luminaires ................................ Installation of L�mpholders ................ Lamps and Auxiliary Equipment ........................ Special Provisions for Flush and Recessed Lu.minaires ........................................................... Construction of Flush andRecessed Lu.n1inaires ........................................................... Special Provisions for Electric-Discharge Lighting Systems of IOOO Volts or Less ............... Special Provisions for Electric-Discharge Lighting Systems of More Than 1000 Volts ........ Lighting Track ...................................................... Decorative Lighting and Similar Accessories ..... Special Provisions for Horticultural Lighting Equipment ............................................................ Low-Voltage Lighting ........................................... Appliances ............................................................ General ................................................................. 70- 278 70- 279 70- 279 70- 280 70- 280 70- 282 70- 282 70- 282 70- 282 70- 283 70- 283 70- 284 70- 285 70- 285 70- 285 70- 286 70- 286 70- 286 Installation ............................................................ 70- 287 Disconnecting Means ........................................... 70- 289 Construction ..................... ................................... 70- 290 Marking ................................................................ 70- 291 Fixed Electric Space-Heating Equipment .......... 70- 291 General ................................................................. 70- 291 Part II. Part Ill. Part IV. Part V. Part VI. Part VII. Part VIII. Part IX. Part X. 425 Part I. Part II. Part 111. Part IV. Part V. Part VI. Part VII. 426 Part I. Part II. Part Ill. Part IV. Part V. Part VI. 427 Part I. Part II. Part Ill. Part IV. Part V. Part VI. Part VII. 430 Part I. Part II. Part Ill. Part IV. Part V. Installation ............................................................ 70- 291 Control and Protection of Fixed Electric Space- Heating Eqttipment ............................................. 70- 292 Marking of Heating Equipment .......................... 70- 293 Electric Space-Heating Cables ............................. 70- 293 Duct Heaters ........................................................ 70- 295 Resistance-Type Boilers ........................................ 70- 295 Electrode-Type Boilers ......................................... 70- 296 Electric Radiant Heating Panels and Heating Panel Sets .............................................................. 70- 297 Low-Voltage FixedElectric Space-Heating Equipment ............................................................ 70- 298 FixedResistance and Electrode Industrial Process Heating Equipment ................................ 70- 299 General ................................................................. 70- 299 Installation ............................................................ 70- 299 Control and Protection of Fixed Industrial Process Heating Equipment ................................ 70- 299 Marking of Heating Equipment .......................... 70- 301 Fixed Industrial Process Duct Heaters ............... 70- 30I Fixed Industrial Process Resistance-Type Boilers ................................................................... 70- 30I Fixed Industr ial Process Electrode-Type Boilers 70- 302 Fixed Outdoor Electric Deicing and Snow- Melting Equipment .............................................. 70- 303 General ................................................................. 70- 303 Installation ............................................................ 70- 303 Resistance Heating Elements .............................. 70- 303 Impedance Heating ............................................. 70- 304 Skin-Effect Heating .............................................. 70- 304 Control and Protection ....................................... 70- 305 Fixed Electric Heating Equipment for Pipelines and Vessels ............................................................ 70- 305 General ................................................................. 70- 305 Installation .......................................... .................. 70- 306 Resistance Heating Elements .............................. 70- 306 Impedance Heating .............................,............... 70- 306 Induction Heating ............................................... 70- 307 Skin-Effect Heating .............................................. 70- 307 Control and Protection ....................................... 70- 307 Motors, Motor Circttits, and Controllers ............ 70- 308 General ................................................................. 70- 308 Motor Circuit Conductors ................................... 70- 313 Motor and Branch-Circuit Overload Protection 70- 315 Motor Branch-Circuit Shon-Circuit and Ground-Fault Protection ...................... 70- 318 Motor Feeder Short-Circuit and Ground-Fault Protection ............................................................. 70- 321 Part VI. Motor Control Circuits ........................................ 70- 321 Pan VII. Motor Controllers ................................................ 70- 323 Part VIII. Motor Control Centers ........................................ 70- 324 70- 325 70- 327 70- 329 70- 330 70- 330 70- 330 70- 335 70- 335 70- 336 Part IX. Part X. Part XI. Part XII. Part XIII. Part XIV. 440 Part I. Part II. Part III. Disconnecting Means ........................................... Adjustable-Speed Drive Systems ...... ................... Over 1000 Volts, Nominal .................................... Protection of Live Parts-All Voltages .............. Grounding-All Voltages ................................. Tables .................................................................... Air-Conditioning and Refrigerating Eqttipment General .................................... ............................ Disconnecting Means ........................................... Branch-Circuit Short-Circuit and Ground-Fault Protection ............................................................. 70- 337 Pan IV. Branch-Circuit Conductors ................................. 70- 338 Part V. Controllers for Motor-Compressors .................... 70- 339 Part VI. Motor-Compressor and Branch-Circuit Overload Protection ............................................ 70- 339 Part VII. Provisions for Room Air Conditioners ............... 70- 340 NATIONAL ELECTRICAL CODE 2020 Edition
  • 8. CONTENTS 445 450 PartI. PartII. PartI ll. 455 PartI. PartII. 460 PartI. PartII. 470 Part I. Part II. 480 490 Part I. Part II. Part I ll. Part IV. Part V. 500 501 Pan I. PartII. PartI ll. 502 PartI. Pan II. PartI ll. 503 Pan I. PartII. PartI ll. 504 505 506 510 511 513 514 515 516 PartI. PartII. PartI ll. PartIV. PartV. 517 Pan I. PartII. PartI ll. Pan IV. Pan V. Generators............................................................ 70- 340 Transformers and TransformerVaults (I ncluding Secondary Ties) ................................ 70- 342 GeneralProvisions............................................... 70- 342 SpecificProvisionsApplicable to Different Types of Transformers......................................... 70- 346 TransformerVaults............................................... 70- 348 PhaseConverters.................................................. 70- 349 General................................................................. 70- 349 SpecificProvisionsApplicable to Different Types of PhaseConverters................................... 70- 350 Capacitors............................................................. 70- 350 1000Volts, Nominal, and Under........................ 70- 350 Over 1000Volts, Nominal.................................... 70- 351 Resistors andReactors......................................... 70- 352 1000Volts, Nominal, and Under........................ 70- 352 Over 1000Volts, Nominal.................................... 70- 352 Storage Batteries.................................................. 70- 352 Equipment Over 1000Volts, Nominal................ 70- 355 General................................................................. 70- 355 Equipment- SpecificProvisions....................... 70- 355 Equipment- Switchgear andI ndustrial ControlAssemblies.............................................. 70- 357 Mobile and Portable Equipment........................ 70- 359 Electrode-TypeBoilers......................................... 70- 360 Chapter 5 Special Occupancies Hazardous (Classified) Locations, Clas sesI , II , andI ll, Divisions I and 2..................................... ClassI Locations......................................... General................................................................. Wiring............... ............................. ..................... Equipment......................................... ,.................. Class II Locations ................................................. General............... ................................................. Wiring................................................................... Equipment............................................................ ClassI ll Locations................................................ General................................................................. Wiring............... ............................. ..................... Equipment............................................................ I ntrinsically Safe Systems..................................... Zone 0, I, and 2Locations. ................................ Zone 20, 21, and 22Locations forCombustible Dusts or lgnitible Fibers/Flyings......................... Hazardous (Classified) Locations- Specific.... Commercial Garages, Repair and Storage......... Aircraft Hangars ................ .................................. Motor FuelDispensing Facilities........ Bulk Storage Plants ....................................... SprayApplication, Dipping, Coating, and Printing Processes Using Flammable or 70- 361 70- 368 70- 368 70- 368 70- 373 70- 377 70- 377 70- 378 70- 380 70- 383 70- 383 70- 383 70- 384 70- 386 70- 388 70- 402 70- 408 70- 409 70- 411 70- 414 70- 420 Combustible Materials......................................... 70- 423 General................................................................. 70- 423 OpenContainers.................................................. 70- 424 SprayApplication Processes................................ 70- 424 SprayApplication Operations in Membrane Enclosures............................................................ 70- 431 Printing, Dipping, andCoating Processes.......... 70- 432 HealthCare Facilities........................................... 70- 434 General................................................................. 70- 434 Wiring and Protection......................................... 70- 437 Essential Electrical System ( EES) ........................ 70- 440 I nhalationAnesthetizing Locations.................... 70- 447 X-RayI nstallations............................................... 70- 449 2020 Edition NATIONAL ELECTRICAL CODE PanV I. PartV II. 518 520 PartI. PartII. PartI ll. PartIV . Part/. PartVI. PartV II. 522 PartI. PartII. Part111. 525 PartI. PartII. PartI ll. PartIV. 530 PartI. PartII. PartI ll . PartIV . Part/. PartV I. 540 PartI. PartII. Part 111. PartIV . 545 PartI. PartII. 547 550 PartI. PartII. PartI ll . 551 PartI. PartII. PartI ll . PartIV. Part/. PartV I. 552 PartI. PartII. PartI ll. PartIV . PartV . Communications, Signaling Systems, Data Systems, FireAlarm Systems, and Systems Less Than 120Volts, Nominal..................................... 70- 450 IsolatedPowerSystems........................................ 70- 451 Assembly Occupancies.................................. 70- 452 Theaters, Audience Areas of Motion Picture and Television Studios, PerformanceAreas, and SimilarLocations................................................. 70- 453 General................................................................. 70- 453 Fixed Stage Switchboards.................................... 70- 454 Fixed Stage Equipment Other T han Switchboards........................................................ 70- 455 Portable Switchboards on Stage.......................... 70- 457 Portable Stage Equipment Other Than Switchboards........................................................ 70- 459 DressingRooms, DressingAreas, and Makeup Areas. .................................................................... 70- 460 EquipmentGroundingConductor..................... 70- 460 Control Systems for Permanent Amusement Attractions............................................................ 70- 461 General................................................................. 70- 461 ControlCircuits.................................................... 70- 461 ControlCircuitWiring Methods......................... 70- 461 Carnivals,Circuses, Fairs, and Similar Events.... 70- 462 GeneralRequirements......................................... 70- 462 Power Sources...................................................... 70- 463 WiringMethods................................................... 70- 463 EquipmentGrounding and Bonding................. 70- 464 MotionPicture and Television Studios and SimilarLocations................................................. 70- 464 General................................................................. 70- 464 Stage or Set........................................................... 70- 465 DressingRooms.................................................... 70- 467 Viewing, Cutting, and Patching Tables............... 70- 467 Cellulose Niu·ate Film StorageVaults................. 70- 467 Substations............................................................ 70- 467 MotionPictureProjectionRooms...................... 70- 467 General................................................................. 70- 467 Equipment andProjectors of theProfessional Type....................................................................... 70- 467 NonprofessionalProjectors................................. 70- 468 Audio SignalProcessing, Amplification, and Reproduction Equipment................................... 70- 468 ManufacturedBuildings andRelocatable Structures............................................................. 70- 468 General................................................................. 70- 468 Relocatable Structures......................................... 70- 469 AgriculturalBuildings.......................................... 70- 470 MobileI-Jomes, ManufacturedI-Jomes, and MobileI-Jome Parks............................................. 70- 472 General................................................................. 70- 472 Mobile andManufacturedI-Jomes...................... 70- 473 Services and Feeders............................................ 70- 479 RecreationalVehicles andRecreationalVehicle Parks...................................................................... General................................................................. Combination Electrical Systems.......................... Other Power Sources........... ..................... Nominal 120.Volt or 120/240-Volt Systems........ Factory Tests......................................................... RecreationalVehicleParks ................ ,................. Park Trailers......................................................... General................................................................. Low-VoltageSystems............................................ Combination Electrical Systems.......................... Nominal 120.Volt or 120/240-Volt Systems........ Factory Tests......................................................... 70- 480 70- 480 70- 481 70- 482 70- 483 70- 489 70- 489 70- 491 70- 491 70- 492 70- 493 70- 493 70- 500 70-5
  • 9. 555 Part I. Part II. Part Ill. 590 600 Part I. Part II. 604 605 610 Part I. Part II. Part Ill. Part IV. Part V. Part VI. Part VII. 620 Part I. Part II. Part Ill. Part IV. Part V. Part VI. Part VII. Part VIII. Part lX. Part X. 625 Part I. Part II. Part Ill. Part IV. 626 Part I. Part II. Part Ill. Part IV. 630 Part I. Part II. Part Ill. Part IV. 640 Part I. Part II. Part Ill. 645 646 Part I. Part II. Part Ill. Part IV. 647 650 70-6 NAT IONAL ELECTRICAL CODE Marinas, Boatyards, Floating Buildings, and Com�nercial and Noncommercial Docking F'ac1hues ......................................................... General ................................................................. Marinas, Boatyards, and Docking Facilities ........ Floating Buildings ................................................ Temporary Installations ....................................... Chapter 6 Special Equipment 70- 500 70- 500 70- 502 70- 504 70- 504 Electric Signs and Outline Lighting ................... 70- 508 General ................................................................. 70- 508 Field-Installed Skeleton Tubing, Outline Lighting, and Secondary Wiring ......................... Manufactured Wiring Systems ............................ Office Furnishings ............................................... Cranes and Hoists ................................................ General ................................................................. Wiring ................................................................... Contact Conductors ............................................. Disconnecting Means ........................................... Overcurrent Protection ....................................... Control ...................... .......................................... Grounding and Bonding ..................................... Elevators, Dumbv1aiters, Escalators, Nloving Walks, Platform Lifts, and Stairway Chairlifts ..... General ................................................................. Conductors ........................................................... Wiring ................................................................... Installation of Conductors ................................... Traveling Cables ...... ............................................ Disconnecting Means and Control ..................... Overcurrent Protection ....................................... Machine Rooms, Control Rooms, Machinery Spaces, and Control Spaces ................................. Grounding and Bonding ..................................... Emergency and Standby Power Systems ............. Electric Vehicle Power Transfer System General ................................................................. Equipment Construction ..................................... Installation ............................................................ Wireless Power Transfer Equipment ................... Electrified Truck Parking Spaces ........................ General ............ .................................................... Electrified Truck Parking Space Electrical Wiring Systems ..................................................... Electrified Truck Parking Space Supply Equipment ............................................................ Transport Refrigerated Units (TRUs) ................ Electric Welders ................................................... General ................................................................. Arc Welders .......................................... Resistance Welders ............................................... Welding Cable ...................................................... Audio Signal Processing, Amplification, and Reproduction Equipment................................... General ................................................................. PermanentAudio System Installations ............... Portable and Temporary Audio System Installations .......................................................... Information Technology Equipment .................. Modular Data Centers ......................................... General ................................................................. Equipment ............................................................ Lighting ................................................................ Workspace ............................................................ Sensitive Electronic Equipment .......................... Pipe Organs .......................................................... 70- 512 70- 514 70- 515 70- 516 70- 516 70- 517 70- 519 70- 520 70- 520 70- 521 70- 521 70- 521 70- 521 70- 523 70- 525 70- 527 70- 528 70- 528 70- 530 70- 530 70- 530 70- 531 70- 531 70- 531 70- 532 70- 532 70- 535 70- 535 70- 535 70- 536 70- 537 70- 539 70- 540 70- 540 70- 540 70- 541 70- 541 70- 542 70- 542 70- 544 70- 545 70- 546 70- 549 70- 549 70- 552 70- 552 70- 553 70- 553 70- 554 660 Part I. Part II. Part Ill. Part IV. 665 Part I. Part II. 668 669 670 675 Part I. Part II. 680 Part I. Part II. Part III. Part IV. Part V. Part VI. Part VII. Part VIII. 682 Part I. Part II. Part Ill. 685 Part I. Part II. 690 Part I. Part II. Part Ill. Part IV. Part V. Part VI. Part VII. Part VIII. 691 692 Part I. Part II. Part 111. Part IV. Part V. Part VI. Part VII. 694 Part I. Part II. Part Ill. Part IV. Part V. Part VI. Part VII. 695 700 Part I. Part II. X-Ray Equipment ................................................. 70- 555 General ................................................................. 70- 555 Control ................................................................. 70- 556 Transformers and Capacitors .............................. Guarding and Grounding ................................... Induction and Dielectric Heating Equipment ... General ................................................................. Guarding, Grounding, and Labeling .................. Electrolytic Cells ................................................... Electroplating ....................................................... Industrial Machinery ........................................... Electrically Driven or Controlled Irrigation Machines ............................................................... General ................................................................. Center Pivot Irrigation Machines ........................ Swiinming Pools, Fountains, and Similar Installations .......................................................... General ................................................................. Permanently Installed Pools ................................ Storable Pools, Storable Spas, Storable Hot Tubs, and Storable Immersion Pools ................. Spas, Hot Tubs, and Permanently Installed Immersion Pools .................................................. Fountains .......................................... ................... Pools and Tubs for Therapeutic Use .................. Hyclromassage Bathtubs ...................................... Electrically Powered Pool Lifts ............................ Natural and Artificially Macie Bodies of Water .. General ................................................................. Installation ............................................................ Grounding and Bonding ..................................... Integrated Electr ical Systems .............................. General ................................................................. Orderly Shutdown ................................................ Solar Photovoltaic (PV) Systems ... ..................... General ................................................................. Circuit Requirements ........................................ Disconnecting Means ........................................... Wiring Methods and Materials ............................ Grounding and Bonding ..................................... Marking ................................................................ Connection to Other Sources .............. Energy Storage Systems ....................................... 1:,arge-Scale Photovoltaic (PV) Electric Supply Stauons ................................................. Fuel Cell Systems .................................................. General ................................................................. Circuit Requirements .......................................... Disconnecting Means ........................................... Wiring Methods ................................................... Grounding ............................................................ Marking ................................................................ Connection to Other Circuits ............................. Wind Electric Systems .......................................... General ................................................................. Circuit Requirements ......................................... Disconnecting Means ........................................... Wiring Methods ................................................... Grounding and Bonding ..................................... Marking ................................................................ Connection to Other Sources ............................. Fire Pumps ............................................................ Chapter 7 Special Conditions 70- 556 70- 557 70- 557 70- 557 70- 558 70- 558 70- 560 70- 561 70- 562 70- 562 70- 564 70- 564 70- 564 70- 567 70- 573 70- 574 70- 576 70- 578 70- 578 70- 579 70- 579 70- 579 70- 580 70- 580 70- 581 70- 581 70- 582 70- 582 70- 582 70- 583 70- 587 70- 588 70- 590 70- 592 70- 592 70- 592 70- 593 70- 594 70- 594 70- 594 70- 595 70- 595 70- 595 70- 595 70- 595 70- 596 70- 596 70- 597 70- 597 70- 599 70- 599 70- 599 70- 599 70- 600 Emergency Systems .............................................. 70- 605 General ................................................................. 70- 605 Circuit Wiring ....................................................... 70- 607 NATIONAL ELECTRICAL CODE 2020 Edition
  • 10. CONTENTS Part III. Part IV. Part V. Part VI. 701 Part I. Part II. Part III. Part IV. 702 Part I. Part II. 705 Part I. Part II. 706 Part I. Part II. Part III. Part IV. Part V. Part VI. 708 Part I. Part II. Part III. Part IV. Part V. 710 712 Part I. Part II. Part Ill. Part IV. Part V. Part VI. Part Vil. 720 725 Part I. Part II. Part III. Part IV. 727 728 750 760 Part I. Part II. Part III. Part IV. 770 Part I. Part II. Part III. Part IV. Part V. Part VI. 800 Sources of Power .................................................. 70- 608 Emergency System Circuits for Lighting and Power .................................................................... 70- 610 Control -Emergency Lighting Circuits ............ 70- 610 Overcurrent Protection ....................................... 70- 611 Legally Required Standby Systems ...............,...... 70- 612 General ................................................................. 70- 612 CircuitWiring ....................................................... 70- 613 Sources of Power .................................................. 70- 613 Overcurrent Protection ...................................... 70- 614 Optional Standby Systems ................................... 70- 615 General ................................................................. 70- 615 Wiring ................................................................... 70- 616 Interconnected Electric Power ProduCLion Sources .................................................................. 70- 616 General ................................................................. 70- 616 Microgrid Systerns ................................................ 70- 620 Energy Storage Systems ....................................... 70- 621 General ................................................................. 70- 621 Disconnecting Means ........................................... 70- 621 Installation Requirements............. ..................... 70- 622 CircuitRequirements .......................................... 70- 623 Flow BatteryEnergy Storage Systems .................. 70- 624 Other Energy Storage Technologies ................... 70- 624 Critical Operations Power Systems (COPS) ....... 70- 624 General ................................................................. 70- 624 Circuit Wiring and Equipment ........................... 70- 625 Power Sources and Connection .......................... 70- 627 Overcurrent Protection ........ .............................. 70- 628 System Performance and Analysis ....................... 70- 629 Stand-Alone Systems ............................................ 70- 629 Direct Current Microgrids ................................... 70- 630 General ................................................................. 70- 630 Circuit Requirements ..................................... 70- 630 Disconnecting Means ........................................... 70- 631 Wiring Methods ................................................... 70- 631 Marking ................................................................ 70- 631 Protection ............................................................. 70- 631 Systems over 1000 Volts ................................. ...... 70- 631 Circuits and Equipment Operating at Less Than 50 Volts....................................................... 70- 631 Class I, Class 2, and Class 3 Remote-Contr ol, Signaling, and Power-Limited Circuits............... 70- 632 General ................................................................. 70- 632 Class I Circuits .... ............................. .................. 70- 633 Class 2 and Class 3 Circuits .................................. 70- 635 Listing Requirements ........................................... 70- 642 Instrumentation Tray Cable: Type ITC .............. 70- 644 Fire-Resistive Cable Systems ................................ 70- 645 Energy Management Systems .............................. 70- 645 Fire Alarm Systems ............................................... 70- 646 General ................................................................. 70- 646 Non-Power-Limited Fire Alarm (NPLFA) Circuits .................................................................. 70- 647 Power-Limited Fire Alarm (PLFA) Circuits ........ 70- 649 Listing Requirements ........................................... 70- 652 Optical Fiber Cables ............................................ 70- 656 General ............... ................................................. 70- 656 Cables Outside and Entering Buildings ............. 70- 656 Protection ............................................................. 70- 657 Grounding Methods ............................................ 70- 657 Installation Methods Within Buildings ............... 70- 659 Listing Requirements ........................................... 70- 661 Chapter 8 Communications Systems Gen eral Requfrements for Co rnmunications Systems .................................................................. 70- 664 2020 Edition NATIONAL ELECTRICALCODE Part I. PartII. PartIll. PartIV. Part V. 805 Part I. PartII. Part Ill. PartIV. Part V. 810 Part I. PartII. PartIll. PartIV. 820 Part I. Part II. Part Ill. PartIV. Part V. Part VI. 830 Part I. PartII. Part Ill. PartIV. Part V. Part VI. 840 2 4 Part I. PartII. Part Ill. PartIV. Part V. Part VI. Part Vil. 5 5A 8 9 IO ll(A) General ................................................................. 70- 664 Wires and Cables Outside and Entering Buildings ............................................................... Grounding Methods ............................................ Installation Methods Within Buildings ........ Listing Reqttirements ........................................... Comrnunications Circuits .................................... General ................................................................. Wires and Cables Outside and Entering Buildings ............................................................... Protection ............................................................. Installation Methods Within Buildings ............... Listing Requirements ........................................... Radio and Television Equipment ........................ General ................................................................. Receiving Eqttipment-Antenna Systems ........ Amateur and Citizen Band Transmitting and Receiving Stations -Antenna Systems .............. Interior Installation -Transmitting Stations .... Community Antenna Television and Radio Distribution Systems ............................................ General ................................................................. Coa.xial Cables Outside and Entering Buildings Protection ............................................................. Grounding Methods ............................................ Installation Methods Within Buildings ............... Listing Requirements ........................................... Network-Powered Broadband Communications Systems .................................................................. General ................................................................. Cables Outs ide and Entering Buildings ............. Protection ............................................................. Grounding Methods ............................................ Installation Methods Within Buildings ........ Listing Reqttirements ........................................... Premises-Powered Broadband Communications Systems .................................................................. General ................................................................. Cables Outside and Entering Buildings ............. Protection ............................................................. Grounding Methods ............................................ Installation Methods Within Buildings ............... Premises Powering ofCommunications Equipment over Communications Cables .......... Listing Reqttirements ........................................... Chapter 9 Tables Percent of Cross Section of Conduit and 70- 665 70- 666 70- 668 70- 675 70- 675 70- 675 70- 676 70- 676 70- 678 70- 679 70- 680 70- 680 70- 681 70- 683 70- 683 70- 684 70- 684 70- 684 70- 684 70- 685 70- 685 70- 686 70- 686 70- 686 70- 687 70- 688 70- 690 70- 690 70- 691 70- 691 70- 691 70- 692 70- 692 70- 693 70- 693 70- 693 70- 693 Tubing for Conductors and Cables ..................... 70- 695 Radius of Conduit and Tubing Bends ................ 70- 695 Dimensions and Percent Area of Conduit and Tubing (Areas of Conduit or Tubing for the Combinations ofWires Permitted in Table I, Chapter 9) ............................................................ 70- 696 Dimensions ofInsulated Conductors and Fixture Wires ........................................................ 70- 700 Compact Copper and Aluminum Building Wire Nominal Dimensions** and Areas ...................... 70- 704 Conductor Properties .......................................... 70- 705 Alternating-Current Resistance and Reactance for 600-Volt Cables, 3-Phase, 60 Hz, 75° C (l67° F) -Three Single Conductors in Conduit ................................................................. 70- 706 Conductor Stranding ..................... ..................... 70- 707 Class 2 and Class 3 Alternating-Current Power Source Limitations ....................... ....................... 70- 707 70-7
  • 11. 12(A) NAT IONAL ELEC TRICAL CODE PLFA Alternating-Current Power Source Limitations ...................................................... Informative Annex A: Product Safety Standards .... Informative Annex B: Application Information for 70- 709 70- 7IO Ampacity Calculation ..................................................... 70- 716 Informative Annex C: Conduit, Tubing, and Cable Tray Fill Tables for Conductors and Fixture Wires of the Same Size ................................................................. 70- 729 Informative Annex D: Examples .... .............................. 70- 815 Informative Annex E: Types of Construction ............... 70- 829 Informative Annex F: Availability andReliability for Critical Operations Power Systems; and Development and Implementation of Functional Performance Tests (FITs) for Critical Operations Power Systems .............. 70- 831 Informative Annex G: Supervisory Control and Data Acquisition (SCADA) ..................................................... 70- 833 Informative Annex H: Administration and Enforcement ................................................. ................. 70- 834 Informative Annex I: Recommended Tightening Torque Tables from UL Standard 486A-486B .......... 70- 840 Informative Annexj: ADA Standards for Accessible Design ............................................................................. 70- 842 Index ............................................................................... 70- 845 70--8 NATIONAL ELECTRICAL CODE 2020 Edition
  • 12. CONTENTS 445 450 PartI. PartII. PartI ll. 455 PartI. PartII. 460 PartI. PartII. 470 Part I. Part II. 480 490 Part I. Part II. Part I ll. Part IV. Part V. 500 501 Pan I. PartII. PartI ll. 502 PartI. Pan II. PartI ll. 503 Pan I. PartII. PartI ll. 504 505 506 510 511 513 514 515 516 PartI. PartII. PartI ll. PartIV. PartV. 517 Pan I. PartII. PartI ll. Pan IV. Pan V. Generators............................................................ 70- 340 Transformers and TransformerVaults (I ncluding Secondary Ties) ................................ 70- 342 GeneralProvisions............................................... 70- 342 SpecificProvisionsApplicable to Different Types of Transformers......................................... 70- 346 TransformerVaults............................................... 70- 348 PhaseConverters.................................................. 70- 349 General................................................................. 70- 349 SpecificProvisionsApplicable to Different Types of PhaseConverters................................... 70- 350 Capacitors............................................................. 70- 350 1000Volts, Nominal, and Under........................ 70- 350 Over 1000Volts, Nominal.................................... 70- 351 Resistors andReactors......................................... 70- 352 1000Volts, Nominal, and Under........................ 70- 352 Over 1000Volts, Nominal.................................... 70- 352 Storage Batteries.................................................. 70- 352 Equipment Over 1000Volts, Nominal................ 70- 355 General................................................................. 70- 355 Equipment- SpecificProvisions....................... 70- 355 Equipment- Switchgear andI ndustrial ControlAssemblies.............................................. 70- 357 Mobile and Portable Equipment........................ 70- 359 Electrode-TypeBoilers......................................... 70- 360 Chapter 5 Special Occupancies Hazardous (Classified) Locations, Clas sesI , II , andI ll, Divisions I and 2..................................... ClassI Locations......................................... General................................................................. Wiring............... ............................. ..................... Equipment......................................... ,.................. Class II Locations ................................................. General............... ................................................. Wiring................................................................... Equipment............................................................ ClassI ll Locations................................................ General................................................................. Wiring............... ............................. ..................... Equipment............................................................ I ntrinsically Safe Systems..................................... Zone 0, I, and 2Locations. ................................ Zone 20, 21, and 22Locations forCombustible Dusts or lgnitible Fibers/Flyings......................... Hazardous (Classified) Locations- Specific.... Commercial Garages, Repair and Storage......... Aircraft Hangars ................ .................................. Motor FuelDispensing Facilities........ Bulk Storage Plants ....................................... SprayApplication, Dipping, Coating, and Printing Processes Using Flammable or 70- 361 70- 368 70- 368 70- 368 70- 373 70- 377 70- 377 70- 378 70- 380 70- 383 70- 383 70- 383 70- 384 70- 386 70- 388 70- 402 70- 408 70- 409 70- 411 70- 414 70- 420 Combustible Materials......................................... 70- 423 General................................................................. 70- 423 OpenContainers.................................................. 70- 424 SprayApplication Processes................................ 70- 424 SprayApplication Operations in Membrane Enclosures............................................................ 70- 431 Printing, Dipping, andCoating Processes.......... 70- 432 HealthCare Facilities........................................... 70- 434 General................................................................. 70- 434 Wiring and Protection......................................... 70- 437 Essential Electrical System ( EES) ........................ 70- 440 I nhalationAnesthetizing Locations.................... 70- 447 X-RayI nstallations............................................... 70- 449 2020 Edition NATIONAL ELECTRICAL CODE PanV I. PartV II. 518 520 PartI. PartII. PartI ll. PartIV . Part/. PartVI. PartV II. 522 PartI. PartII. Part111. 525 PartI. PartII. PartI ll. PartIV. 530 PartI. PartII. PartI ll . PartIV . Part/. PartV I. 540 PartI. PartII. Part 111. PartIV . 545 PartI. PartII. 547 550 PartI. PartII. PartI ll . 551 PartI. PartII. PartI ll . PartIV. Part/. PartV I. 552 PartI. PartII. PartI ll. PartIV . PartV . Communications, Signaling Systems, Data Systems, FireAlarm Systems, and Systems Less Than 120Volts, Nominal..................................... 70- 450 IsolatedPowerSystems........................................ 70- 451 Assembly Occupancies.................................. 70- 452 Theaters, Audience Areas of Motion Picture and Television Studios, PerformanceAreas, and SimilarLocations................................................. 70- 453 General................................................................. 70- 453 Fixed Stage Switchboards.................................... 70- 454 Fixed Stage Equipment Other T han Switchboards........................................................ 70- 455 Portable Switchboards on Stage.......................... 70- 457 Portable Stage Equipment Other Than Switchboards........................................................ 70- 459 DressingRooms, DressingAreas, and Makeup Areas. .................................................................... 70- 460 EquipmentGroundingConductor..................... 70- 460 Control Systems for Permanent Amusement Attractions............................................................ 70- 461 General................................................................. 70- 461 ControlCircuits.................................................... 70- 461 ControlCircuitWiring Methods......................... 70- 461 Carnivals,Circuses, Fairs, and Similar Events.... 70- 462 GeneralRequirements......................................... 70- 462 Power Sources...................................................... 70- 463 WiringMethods................................................... 70- 463 EquipmentGrounding and Bonding................. 70- 464 MotionPicture and Television Studios and SimilarLocations................................................. 70- 464 General................................................................. 70- 464 Stage or Set........................................................... 70- 465 DressingRooms.................................................... 70- 467 Viewing, Cutting, and Patching Tables............... 70- 467 Cellulose Niu·ate Film StorageVaults................. 70- 467 Substations............................................................ 70- 467 MotionPictureProjectionRooms...................... 70- 467 General................................................................. 70- 467 Equipment andProjectors of theProfessional Type....................................................................... 70- 467 NonprofessionalProjectors................................. 70- 468 Audio SignalProcessing, Amplification, and Reproduction Equipment................................... 70- 468 ManufacturedBuildings andRelocatable Structures............................................................. 70- 468 General................................................................. 70- 468 Relocatable Structures......................................... 70- 469 AgriculturalBuildings.......................................... 70- 470 MobileI-Jomes, ManufacturedI-Jomes, and MobileI-Jome Parks............................................. 70- 472 General................................................................. 70- 472 Mobile andManufacturedI-Jomes...................... 70- 473 Services and Feeders............................................ 70- 479 RecreationalVehicles andRecreationalVehicle Parks...................................................................... General................................................................. Combination Electrical Systems.......................... Other Power Sources........... ..................... Nominal 120.Volt or 120/240-Volt Systems........ Factory Tests......................................................... RecreationalVehicleParks ................ ,................. Park Trailers......................................................... General................................................................. Low-VoltageSystems............................................ Combination Electrical Systems.......................... Nominal 120.Volt or 120/240-Volt Systems........ Factory Tests......................................................... 70- 480 70- 480 70- 481 70- 482 70- 483 70- 489 70- 489 70- 491 70- 491 70- 492 70- 493 70- 493 70- 500 70-5
  • 13. NATIONAL ELECTRICAL CODE Code-Making Panel No. 1 Articles 90, 100, 110, Chapter 9, Table I0, Annex A, Annex H, Annex I, and AnnexJ Kenneth P. Boyce, Chair UL LLC, IL[RT] Louis A. Barrios, Shell Global Solutions, TX [U] Rep. American Chemistry Council Roland E. Deike,Jr.,CenterPoint Energy,Inc., TX [UT] Rep. Electric Light & Power Group/EEi Ernest]. Gallo, Telcordia Technologies (Ericsson), NJ[U] Rep. Alliance for TelecommunicationsIndustry Solutions Palmer L. Hickman, Electr ical Training Alliance, MD [L] Rep.International BrotJ1erhood of Electrical Workers David L. Hittinger,Independent Electrical Contractors of Greater Cincinnati, OH [IM] Rep.Independent Electr ical Contractors, Inc. James E.Brw,ssen, Telcordia Technologies (Ericsson), NJ [U] (Alt. to ErnestJ. Gallo) Mark Christian, Electrical Training Alliance, TN [L] (Alt. to Palmer L. Hickman) Jon Coulimore,JC Electric,Inc., WA[IM] (Alt. to David L. Hittinger) Timothy Garland, Keene State College, NH [U] (Voting Alt.) Larry Geyer, Quality Electric Inc.,ID[IM] (Alt. to HarryJ. Sassaman) Joseph Marquardt,ExxonMobil Production Company, TX [U] (Alt. to Louis A. Barrios) Roger D. McDaniel, Georgia Power Company, GA[UT] (Alt. to Roland E. Deike,Jr.) Ark Tsisserev, AES Engineering, Canada [SE] Rep. CSA/Canadian Electrical Code Committee 70-10 Donald R. Iverson, National Electrical Manufacturers Association, MI[M] Rep. National Electrical Manufacnirers Association James F. Pierce,Intenek Testing Services, OR [RT] HarryJ. Sassaman, Forest Electric Corporation, NJ [IM] Rep. National Electrical Contr actors Association Kent A. Sayler, P2SInc., CA [U] Rep. Institute ofElectrical & Electronics Engineers, Inc. Mohinder P. Sood,City ofAlexandria, VA[E] Rep. International Association of Electrical Inspectors Alternates Kenneth L. McKinney,Jr., UL LLC, NC[RT] (Alt. to KennetJ1 P. Boyce) Donald R. Offerdahl, lntenek Testing Services, ND[RT] (Alt. toJames F. Pierce) Michael C. Stone, National Electrical Manufacturers Association, CA[MJ (AIL to Donald R.Iverson) Frank E. Tyler, The DuPont Company, Inc., DE[U] (AIL to Kent A. Sayler) Charles Valaer, City Of Glendale California, CA [E] (Alt. to Mohinder P. Sood) Nonvoting NATIONAL ELECTRICAL CODE 2020 Edition
  • 14. COMMITTEE PERSONNEL Code-Making Panel No. 2 Articles 210, 220, Annex D, Examples DI through D6 Mark R. Hilbert, Chair MR Hilbert Electrical Inspections & Training, NH [El Rep. International Association of Electrical Inspectors Mathher Abbassi,New York City Department Of Buildings, NY [El Charles L. Boynton, The DuPont Company, Inc., TX [U] Rep. American Chemistr y Council Daniel Buuck, NationalAssociation of Home Builders (NAHB), DC [U] Rep. National Association of Home Builders Steve Campolo, Leviton Manufacturing Company, Inc., NY [Ml Thomas A. Domitrovich, Eaton Corporation, MO [M] Rep. National Electrical Manufacturers Association Nehad El-Sherif,Saskatoon, SKCanada [U] Rep. Institute of Electrical & Elecu·onics Engineers, Inc. Thomas L. Harman, University of Houston-Clear Lake, TX [SE] David W.Johnson, CenTex IEC, TX [IM] Rep. Independent Electrical Contractors, Inc. Alan Manche, Schneider Elecu-ic, KY [Ml John McCamish, NECA !BEW Elecu-ical Training Cemer, OR [L] Rep. International Brotherhood of Electrical Workers ChristopherJ. Pavese, Duke Energy, KY [UT] Rep. Elecu-ic Light & Power Group/EEi Frederick P. Reyes, UL LLC, NY [RT] Michael Weaver, M&W Electric, OR [IM] Rep. National Electrical Contractors Association Alternates William B. Crist,Jr., IES Residential Inc., TX [IM] (AIL LO David W.Johnson) Andrew Kriegman, Leviton Manufacturing Company, Inc., NY [M] (Alt. to Steve Campolo) Brett Larson, Schneider Electric, IA [M] (AIL LO Alan Manche) Cesar Lujan, National Association of Home Builders (NAH.B), DC [U] (AIL LO Daniel Buuck) Roger D. McDaniel, Georgia Power Company, GA [UT] (Alt. to Christopher]. Pavese) Daniel].Naughton,JATC of Greater Boston, !VIA [L] (AIL toJohn McCamish) Fred Neubauer, Neubauer Electric Inc., CA [IM] (AIL to Michael Weaver) Robert D. Osborne, UL LLC, NC [RT] (Alt. to Frederick P. Reyes) Fernando E. Pacheco, MetJrnnex Chile SA, TX [U] (AIL Lo Charles L. Boymon) Brian E. Rock, Hubbell Incorporated, CT [M] (AIL Lo Thomas A. Domiu-ovich) Joseph]. Wages,Jr., International Association of Electrical Inspectors, TX [E] (AIL to Mark R. Hilbert) Nonvoting Douglas A. Lee, U.S. Consumer Product Safety Commission, MD [CJ Andrew M. Trotta, U.S. Consumer Product Safety Commission, MD [CJ Rep. U.S. Consumer Product Safety Commission Rep. U.S. Consumer Product Safety Commission 2020 Edition NATIONAL ELECTRICAL CODE 70-11
  • 15. NAT IONAL ELECTRICAL CODE Code-Making Panel No. 3 Articles 300,590,720,725,727,728,760,and Chapter 9,Tables ll(A) and (B),and Tables 12(A) and (B) Robert A.Jones, Chair Independent Elecu-ical Conu-actors, Inc., TX [IM] Rep. Independent EleCLrical Contractors, Inc. Richard S. Anderson, RTKL Associates Inc., VA[Ml Rep. Building Industry Consulting Services International Douglas P. Bassett, XFinity Home, FL [IM] Rep. EleCLronic Security Association Larry G. Brewer, lntertek Testing Services, NC [RT] Steven D. Burlison, Duke Energy, FL [UT] Rep. EleCLric Light & Power Group/EEi Paulj. Casparro, Scranton Elecu-iciansJAT C, PA [L] Rep. International Brotherhood of Electrical Workers Shane M. Clary, Bay Alarm Company, CA[Ml Rep. Automatic Fire Alarm Association, Inc. Raymond W. Horner, Allied Tube & Conduit, IL [M] Rep. National Elecu-ical Manufacturers Association Adam D. Corbin, Corbin Elecu-ical Services, Inc., NJ [IM] (Alt. to Robert A.Jones) Michael]. Farrell Ill, Lucas County Building Regulation, MI[L] (AIL LO PaulJ. Casparro) Joel Goergen, Cisco Systems, Inc., CA[Ml (Alt. to Chad M.Jones) WardJudson, Pentair/ERICO International Corporation, OH[M] (Alt. to Richard S. Anderson) Kyle Krueger, NationalElectrical Contractors- Milwaukee Chapter, Wl[IM] (VotingAlt.) John Lupacchino, Gaylor Elecu-ic Incorporated, IN [IM] (Alt. to Steven J. Owen) Jack McNamara, Bosch Security Systems, NY [M] (Alt. to Shane M. Clary) Timothy J. Mikloiche, Town of West Hartford, CT [E] (Alt. to Charles]. Palmieri) Edward C. Lawry, Oregon, WI [E] ( Member Emeritus) 70-12 Randolph]. Ivans, UL LLC, NY [RT] Chad M.Jones, Cisco Systems, OH [Ml T. David Mills, T. David Mills Associates, LLC, GA [U] Rep. Institute of Elecu-ical & EleCLronics Engineers, Inc. Steven]. Owen, StevenJ. Owen, Inc., AL[IM] Rep. Associated Builders & Contractors David A. Pace, Olin Corporation, AL [U] Rep. American Chemistry Council Charles]. Palmieri, Town of Norwell, MA [E] Rep. InternationalAssociation of Elecu-ical Inspectors John E. Sleights, Travelers Insurance Company, CT [I] George Allan Zimmerman, CME Consulting, Inc., CA[SE] Rep. Ethernet Alliance Alternates Mark C. Ode, UL LLC, AZ [RT] (Alt. to Randolph J. Ivans) ChristopherJ. Pavese, Duke Energ y, KY [UT] (Alt. to Steven D. Burlison) Dmitriy V. Plotnikov, lntertek Testing Services, NJ[RT] (Alt. to Larry G. Brewer) Rick D. Sheets, AT&T Digital Life, TX[IM] (Alt. to Douglas P. Bassett) George A. Straniero, AFC Cable Systems, Inc., NJ [M) (Alt. to Raymond W. Horner) William C. Szeto, McKinney, TX [U] (Alt. to T. David Mills) Rebecca S. Templet, Shell Chemical, LA[U] (Alt. to Da,;d A. Pace) Nonvoting NATIONAL ELECTRICAL CODE 2020 Edition
  • 16. COMMITTEE PERSONNEL Code-Making Panel No. 4 Articles 690, 692, 694, 705 JamesJ. Rogers, Chair Towns of Oak Bluffs, Tisbury, West Tisbury, MA [El Rep. Imernational Association of Electrical Inspectors William F. Brooks, Brooks Engineering, CA [U] Rep. Photovoltaic Industry CodeCouncil Bill Brown, Schneider Electric, TN [M] Rep. National Electrical Manufacturers Association Thomas E. Buchal, Intertek Testing Services, NY [RT] James G. Cialdea, CE Power Engineered Se,vices, LLC, MA [IM] Rep. ImerNational Electrical Testing Association Timothy M. Croushore, FirstEnergy Technologies, PA [UT ] Rep. Electric Light & Power Group/EEi Jason M. Fisher, TeslaInc., VA [U] Rep. Solar Energy Industries Association Todd Fries, HellermannTyton, WI [M) Mark D. Gibbs, URSJCH2M Oak Ridge LLC (UCOR), TN [U) Rep. Institute of Electrical & Electronics Engineers, Inc. Rebekah Wharton Hren, IPPNC LLC, NC [U) Rep. Solar Energy Imernational John S. Berdner, Solarcowboyz, CA [U) (Alt. to William F. Brooks) Ron Borowski, Eaton Corporation, WI [M) (Alt. LO Bill Brown) Ward I. Bower, Solar Energy l ndusu·ies Association, NM [U) (Alt. toJason M. fisher) Mark Gillespie, TMI Elecu·ic, OH [IM) (Alt. LO Duke W. Schamel) Anthony Granato, Manchester Fire Rescue EMS, CT [L) (Alt. to Matthew Paiss) Howard Liu, l ntertek Testing Se,vices, NY [RT) (AIL LO Thomas E. Buchal) Brian Mehalic, Winston-Salem, NC [U) (Alt. to Rebekah Wharton Hren) Stephen W. Douglas, QPS Evaluation Services Inc., Canada [SE) Rep. CSA/Canadian Electrical Code Committee 2020 Edition NATIONAL ELECTRICAL CODE Lee M. Kraemer, First Solar, OH [Ml Rep. Large-Scale Solar Association MatthewPais.s, SanJose Fire Department, CA [L) Rep. Imernational Association of Fire Fighters IrozeneIIPruitt, The DuPont Company, Inc., TX [U) Rep. American Chemistry Council Duke W. Schamel, Electrical Service Solutions, Inc., CA [IM] Rep. Independem Electrical Comractors, Inc. RonaldJ. Toomer, Toomer Electrical Company Inc., LA [IM) Rep. National Electrical Contractors Association Wendell R. Whistler, IBEW 1547, OR [L) Robert H. Wills, lntergrid, LLC, NH [U] Rep. American Wind Energy Association Timothy P. Zgonena, UL LLC, IL [RT) Alternates Harold C. Ohde, IBEW 134/ElectricalJoim Apprenticeship Training & Trust, LL [L) (AIL to Wendell R. Whistler) Isaac Opalinsky, Sunpower Corporation, MD [Ml (Alt. to Lee M. Kr aemer) Rhonda Parkhurst, City ofPalo Alto, CA [El (AIL toJamesJ. Rogers) Robert W. Preus, National Renewable Energy L�b, CO [U) (AlL to Robert H. Wills) Kent Whitfield, Underwriters Laboratories, CA [RT) (AIL to Timotl1y P. Zgonena) Leo Zieman, Florida Power & Light (Nextera Energy), FL [UT) (AIL to Timothy M. Croushore) Nonvoting 70-13
  • 17. NAT IONAL ELECTRIC AL CODE Code-Making Panel No. 5 Articles 200, 250 Nathan Philips, Chair Integrated Electronic Systems, OR [IM] Rep. National ElectricalComraCLors Association Paul W. Abernathy, Encore Wire Corporation, TX[Ml Rep. The Aluminum Association, Inc. Joseph F. Andre, Steel Tube Institute, WA [M) Rep. Steel Tube Institute of North America Gary A. Beckstrand, Utah Electrical JATC, UT [L] Rep. International Brotherhood of Electrical Workers Trevor N. Bowmer, Telcordia (Ericsson), NJ [U) Rep. Alliance for Telecommunications Industry Solutions David Brender, Copper Development Association, Inc., NY[M] Rep. Copper Developmem Association Inc. Paul Dobrowsky, Innovative Technology Services, NY [U) Rep. American Chemistry Council David A. Gerstetter, UL LLC, IL [RT) Larry Albert, Stanley Black And Decker, MD [M] (Alt. toJoseph Harding) Derrick L. Atkins, Minneapolis Electrical.JATC, MN[L) (Alt. to Gary A. Beckstrand) Kenneth S. Crawford, Chemours Company, 'NV [U] (Alt. to Paul Dobrowsky) Joseph P. DeGregoria, UL LLC, NY [RT] (Alt. to David A. Gerstetter) Raymond Dunnigan, Imenek, NY [RT) (Alt. to Christine T. Porter) ErnestJ. Gallo, Telcordia Technologies (Ericsson), NJ [U] (Voting AIL) BobbyJ. Gray, Hoydar/Buck, Inc., WA[IM) (Alt. to Nathan Philips) Buster Grissett, Mississippi PowerCompany, MS [UT) (Alt. to Mike O'Meara) Robert A. Nelson, Canadian Standards Association, Canada [RT] 70-14 G. Scott Harding, F. B. Harding, Inc., MD [IM] Rep. Independent Electrical Contractors, Inc. JosephHarding, Power ToolInstitute, OH [Ml Daleep C. Mohla, DCM EleCLrical Consulting Services, Inc., T X [U) Rep. lnstinne ofElecu·ical & Electronics Engineers, Inc. Mike O'Meara, Arizona Public Se,vice Company, AZ [UT) Rep. Electric Light & Power Group/EEi William A. Pancake, III, CAP Government, FL [E) Rep. International Association of Electrical Inspectors Christine T. Porter, lmenek Testing Services, WA [RT) Nick Sasso, State of Wyoming, WY[El GregoryJ. Steinman, Thomas & Betts Corporation, TN[M) Rep. National Electrical Manufacturers Association Alternates Raymond W. Homer, Allied Tube & Conduit, IL [M) (Alt. to Joseph F. Andre) Ronald Lai, Burndy LLC, NH[M] (AIL to GregoryJ. Steinman) Karin Manfredi, AFC Cable Systems/Atkore, !VIA[M) (Alt. to Paul W. Abernathy) Richard M. O'Brien, IAEI, NV [E) (Alt. to William A. Pancake, Ill) Davidj. Picatti, Picatti Bros. Inc., DBA Industrial Service & Electric, WA[IM] (Alt. to G. Scott Harding) Phil Simmons, Simmons Electrical Se1vices, WA [Ml (Alt. to David Brender) Nonvoting NATIONAL ELECTRICAL CODE 2020 Edition
  • 18. COMMITTEE PERSONNEL Code-Making Panel No. 6 Articles310,311,320,322,324,326,328,330,332,334,336,337,338,340,382,394,396,398,399,400,402, Chapter 9,Tables5 through 9,Annex Band Example D7 Susan Newman Scearce, Chair City of Humboldt, TN, TN [E) Rep. International Association ofElectrical Inspectors Todd Crisman,IBEW Local 22JATC, NE [L) Rep. International Brotherhood ofElectrical Workers Joseph W. Cross,Eastman Chemical Company, TN [U) Rep. American Chemistr y Council Dennis A. Nielsen, L�wrence Berkeley National Laboratory, CA [U] Rep. Institute of Electrical & Electronics Engineers, Inc. Timothy Earl,GBH International, MI [M) Rep. The Vinyl Institute Christel K. Hunter,Cerro Wire, NV [M) Rep. The Aluminum Association, Inc. Gerald W. Kent, Kent Electric & Plumbing Systems, TX [IM) Rep. Independent Electrical Contractors, Inc. Charles David Mercier, Southwire Company, GA [Ml Rep. National Electrical Manufacturers Association David Carroll,Florida Power And Light, FL [UT) (Alt. to Michael Thomas Porcaro) ChrisJ. Fahrenthold,Facility Solutions Group, TX [IM) (Alt. to Gerald W. Kent) Samuel B. Friedman,General Cable Corporation, RI [M) (AIL to Charles David Mercier) Hermanj. Hall,Austin, TX [Ml (Alt. to Timothy Earl) Samuel R. La Dart, City ofMemphis, TN [L] (Alt. to Todd Crisman) 2020 Edition NATIONAL ELECTRICAL CODE Michael Thomas Porearo, National Grid, MA [UT) Rep. Electric Light & Power Group/EEi Kenneth Riedl,lntertek Testing Se1vices, NY [RT] Rep. Intertek Testing Seivices Susan L. Stene,UL LLC, CA [RT) George A. Straniero,AFC Cable Systems, Inc., NJ [M) Rep. Copper Development Association Inc. Wesley L. Wheeler,National Electr ical Conu·actors Association, MD [IM) Rep. National Electrical Contractors Association Alter nates Kelly Lamp, Idaho Chapter NECA, ID [IM) (AIL to Wesley L. Wheeler) Borgia Noel, State of Wyoming Fire Marshal's Office, IN [El (AIL to Susan Newman Scearce) Kevin T. Porter,Encore Wire Corporation, TX [M) (AIL to Christel K. Hunter) Mario Xerri,UL LLC, NY [RT) (AIL to Susan L. Stene) Joseph S. Zimnoch,TI1e Okonite Company, NJ [M] (AIL to George A. Straniero) 70-15
  • 19. NATIONAL ELECTRICAL CODE Code-Making Panel No. 7 Articles 545,547,550,551,552,553,555,604,675,and Annex D,Examples D11 and D12 L. Keith Lofland, Chair InternationalAssociation of Electrical Inspectors (IA EI), T X [El Rep. International Association of Electrical Inspectors Jorge L. Arocha, Florida Power & Light, FL [UT] Rep. Edison Electr ic Institute Joseph R. Chandler, Independent Electrical Contractors-Dallas, TX [IM] Rep. Independent Elecu·ical Contractors, Inc. Wade Elliott, Utility Services Group, Inc., WA [U] Rep. National Association of RV Parks & Campgrounds RobertJ. Fick, Alliant Energy, WI [U] Rep. American Society ofAgricultural & Biological Engineers Robert A. Garcia, Cavco Industries/Fleetwood Homes, Inc., AZ [M] Bruce A. Hopkins, Recreation Vehicle Industry Association, VA [M] Ryan Hyer, Testing Engineers International, UT [RT] Thomas R. L ichtenstein, UL LLC, IL [RT] Doug Mulvaney, Kampgrounds ofAmerica, Inc., MT [U] Clifford Norton, Bellingham Marine Utilities, FL [IM] Richard A. Paredes, LBEW Local 164JATC, NJ [L] Rep. International Brotherhood of Electr ical Workers Stephen G. Rood, Legrand North America, NY [Ml Rep. National Elect rical Manufacturers A�sociation Dave Watson, Southwire, GA [M] Rep. TheAluminum Assodation, Inc. Wesley L. Wheeler, National Electrical Contractors Association, MD [IM] Rep. National Electrical Contractors Association Michael L. Zieman, RADCO, CA [M] Rep. Manufactured Housing Institute Alternates Barry S. Bauman, Alliant Energy, WI [U] (Alt. to RobertJ. Fick) William Bruce Bowman, Fox Systems, Inc., GA [IM] (Alt. toJoseph R. Chandler) Byron Carroll, Carrol Woods Inc., NC [U] (Alt. to Wade Elliott) Gerald D. Dix, Hampton Roads Joint Apprenticeship Training Committee, VA [L] (Alt. to Richard A. Paredes) Dean C. Hunter, Minnesota Department of L�bor & Industry, MN [El (Alt. to L. Keith Lofland) 70-16 Jeffrey Kreidler, Kampgrounds ofAmerica Inc., MT [U] (Alt. to Doug Mulvaney) Mark C. Ode, UL LLC, AZ [RT] (AIL to Thomas R. Lichtenstein) Kent Perkins, Recreation Vehicle Industry Association, VA [Ml (Alt. to Bruce A. Hopkins) Pau!J. Reis, AFC Cable Systems, Inc., MA [M] (Alt. to Dave Watson) MatthewJ. Samojeden, Hubbell Incorporated, CT [M] (Alt. to Stephen G. Rood) NATIONAL ELECTRICAL CODE 2020 Edition
  • 20. COMMITTEE PERSONNEL Code-Making Panel No. 8 Articles342,344,348,350,352,353,354,355,356,358,360,362,366,368,370,372,374,376,378,380,384,386, 388,390,392,Chapter 9,Tables1 through 4,Example D13,and Annex C Doug Adams, MP Husky LLC, SC [M) Larry D. Cogburn, Chair Cogburn Bros., Inc., FL [IM) Rep. National EleCLrical Contractors Association Richard E. Loyd, R & N Associates, AZ [M] Rep. Steel Tube Institute ofNorth America Rep. Cable Bus Manufacturers Association RichardJ. Berman, UL LLC, IL [RT) David M. Campbell, AFC Cable Systems, Inc., MA [M) Rep. The Aluminum Association, Inc. Michael C. Martin, ExxonMobil Research & Engineering, TX [U) Rep. American Chemistry Council Kenneth W. Hengst, 4C2 E lectrical Specialists, TX [IM) Rep. Independent Electrical Contractors, Inc. PeteJackson, City ofBakersfield, California, CA [El Rep. International Association ofElectrical Inspectors David H. Kendall, Thomas & Betts Corporation, TN [M) Rep. The Vinyl Institute Paul W. Myers, Nutrien, OH [U) Rep. Institute ofElectrical & Electronics Engineers, Inc. Donald R. Offerdahl, Intertek Testing Services, ND [RT) Rhett A. Roe, IBEW Local Union 26JATC, MD [L) Rep. International Brotherhood ofElectrical Workers Rodney J. West, Schneider Electric, OH [Ml Rep. National Electrical Manufacturers Association Alternates Jay Burris, Wheatland Tube (Div. ofZekelmanIndustries), OH [Ml (AIL to Richard E. Loyd) Joel (Joey) Crider, AEP, OH [UT) (Voting Alt.) Brian Deacy, Allied Tube Conduit Corporation, IL [Ml (Alt. to David H. Kendall) David A. Gerstetter, UL LLC, IL [RT) (Alt. LO RichardJ. Berman) J. Grant Hammett, Colorado State Elecu·ical Board, CO [E) (Alt. to PeteJackson) Gary K.Johnson, Dow Corning Corporation, LA [U) (Alt. to Michael C. Martin) Stephen P. Poholski, Newkirk Electric Associates, Inc., MI [IM) (AIL to Larry D. Cogburn) Dan Rodriguez, IBEW Local Union 332, CA [L) (AIL to Rhett A. Roe) Frederic F. Small, Hubbell Incorporated, CT [Ml (Alt. to RodneyJ. West) Dan Suriyamongkol, Advanced Cable Bus, SC [Ml (AIL to Doug Adams) Raul L. Vasquez, IndependentElectrical Contractors, TX [IM) (Alt. to Kenneth W. Hengst) Dave Watson, Southwire, GA [M) (Alt. to David M. Campbell) Nonvoting Stephen W. Douglas, QPS Evaluation Services Inc., Canada [SE) Rep. CSA/Canadian Electrical Code Committee 2020 Edition NATIONAL ELECTRICAL CODE 70-17