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Fire Pump Short Circuit and WIC Considerations

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James S Nasby
James S Nasby

www.Lucky-Bet.site => Bet on Sports - 50% Deposit Bonus www.Lucky-Bet.site/casino => Online Casino - 5000$ Welcome Bonus www.Lucky-Bet.site/lotto247 => Lotto247 - Win Big, Live Free www.Lucky-Bet.site/eurobet => Best European Bookmaker www.earnperhit.com/essay => Professional academic writing Short Circuit and WIC Considerations for Motor Driven Fire Pump and Other Motor Controllers.

Technology
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Short Circuit (WIC) Testing and Parameters. - for - F.M. Approvals - by - James S. Nasby Columbia Engineering
Topics to be Covered ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Definitions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
More Definitions ,[object Object],[object Object],[object Object]
Yet More Definitions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Still More Definitions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
First Half Cycle Offset Waveforms 2.83 x LRA = 6 x 2.83 x FLA = 17.0 x FLA Maximum Theortical This curve shows starting a motor which still has BACK EMF (voltage) present.
Parametric Considerations ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Type of Faults (Shorts) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Higher Level Faults ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Lower (Medium) Level Faults ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Low Level and Arcing Faults ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Breaking the Fault ,[object Object],[object Object],[object Object],[object Object],[object Object]
Power Factor Waveforms
Power Factor Waveforms
Typical Fire Pump Controller Breaker Curve Notes : 1) “F” Frame = 250 Amp Frame Rating. (260 x 250A = ~ 65 Kamp) 2) Typically two devices are used in series (I/S + C/B) to achieve ratings up to 100 Kamp. 3) Ratings to 200 Kamp are available 4) Curve shown is different for Current Limiting Breakers
Typical EFPC Ratings Nameplates Note
NFPA Required WIC Rating WIC = Short Circuit W ithstand and I nterrupting C apacity Rating Controller WIC Rating Must Equal or Exceed the Available Short Circuit Current from the Power Source. Note: Some controllers now being sold with WIC’s below 100 Kamp. This doubles need to check available fault (S.C.) current.
What’s Wrong with This Picture?
Main Reason for Bolted Fault Short Circuits… … and for Motor Junction Box Explosion. Note that Workmanship is Vital.
Cause for Overpressure
Cause – cont’d
Clearing the Fault (Safely Breaking the Circuit) ,[object Object],[object Object]
Testing UL-218 & FM-1321/23 ,[object Object],[object Object],[object Object],[object Object],[object Object]
Testing UL-218 & FM-1321/23 ,[object Object],[object Object],[object Object],[object Object],[object Object]
Testing UL-218 & FM-1321/23 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Testing UL-218 & FM-1321/23 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Testing UL-218 & FM-1321/23 ,[object Object],[object Object],[object Object],[object Object],[object Object]
Testing UL-218 & FM-1321/23 ,[object Object],[object Object],[object Object],[object Object]
Testing UL-218 & FM-1321/23 ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Arc Flash and PPE Requirements ,[object Object],[object Object]
PPE Levels Defined - NFPA-70E ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Note: See Also: Table 130.7(C)(10) Protective Clothing and Personal Protective Equipment (PPE) Matrix
Selective Coordination ,[object Object],[object Object],[object Object]
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Fire Pump Short Circuit and WIC Considerations

  • 1. Short Circuit (WIC) Testing and Parameters. - for - F.M. Approvals - by - James S. Nasby Columbia Engineering
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  • 7. First Half Cycle Offset Waveforms 2.83 x LRA = 6 x 2.83 x FLA = 17.0 x FLA Maximum Theortical This curve shows starting a motor which still has BACK EMF (voltage) present.
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  • 16. Typical Fire Pump Controller Breaker Curve Notes : 1) “F” Frame = 250 Amp Frame Rating. (260 x 250A = ~ 65 Kamp) 2) Typically two devices are used in series (I/S + C/B) to achieve ratings up to 100 Kamp. 3) Ratings to 200 Kamp are available 4) Curve shown is different for Current Limiting Breakers
  • 17. Typical EFPC Ratings Nameplates Note
  • 18. NFPA Required WIC Rating WIC = Short Circuit W ithstand and I nterrupting C apacity Rating Controller WIC Rating Must Equal or Exceed the Available Short Circuit Current from the Power Source. Note: Some controllers now being sold with WIC’s below 100 Kamp. This doubles need to check available fault (S.C.) current.
  • 19. What’s Wrong with This Picture?
  • 20. Main Reason for Bolted Fault Short Circuits… … and for Motor Junction Box Explosion. Note that Workmanship is Vital.
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  • 34. JSN on the air http://www.cooperbussmann.com/presentations/player.html