In the spaces provided, fill in the cover depth for the following residential underground
installations. See NEC Table 300.5. Type UF. No other protection. 24 in Type UF below
driveway. 18 in Rigid metal conduit under lawn. 6 in Rigid metal conduit under driveway. 18 in
Electrical metallic tubing between house and detached garage. 6 in UF cable under lawn. Circuit
is 120 volts, 20 amperes, GFCI protected. 12 in Rigid PVC conduit approved for direct burial no
other protection. _ Rigid PVC conduit. Circuit is 120 volts, 20 amperes, GFCI protected. _ Rigid
conduit passing over solid rock and covered by 2in. (50mm) of concrete extending down to rock.
_
Solution
Answer:-
a) Type UF. No other protection. As per table -24 in.
b) Type UF below driveway. As per table -18 in.
c) Rigid metal conduit under lawn.As per table -6 in
d) Rigid metal conduit under driveway.As per table -18 in
e) Electrical metalic tubing between house and detached garage.-As per table 18 in
f) UF cable under lawn. Circuit is 120 volts, 20 amperes, GFCI protected.- As per table 12 in.
g) Rigid PVC conduit approved for direct burial no other protection. As per table 24 in.
h) Rigid PVC conduit Circuit is 120 volts, 20 amperes, GFCI protected. As per table 6 in.
i) Rigid conduit passing over solid rock and covered by 2 in. ( 50mm) of concrete extending
down to rock. As per table 13 in.