Licensed Electrical Contractor Services, Feeders, and Branch Circuits 3

Question 1

What is the minimum burial depth for a service lateral installed in rigid metal conduit (RMC) under a residential driveway?

Accepted Answer

12 inches

Answer

6 inches

Answer

18 inches

Answer

24 inches

Question 2

When calculating feeder loads for a commercial occupancy with 30 or more receptacles, NEC 220.44 allows a demand factor for receptacles above 10 kVA of:

Accepted Answer

50%

Answer

60%

Answer

75%

Answer

90%

Question 3

Service-entrance cable (Type SE) used as interior wiring must comply with the requirements of:

Accepted Answer

Article 338 and applicable wiring method articles

Answer

Article 230 only

Answer

Article 310 only

Answer

Article 250

Question 4

Per NEC 230.54, service-entrance conductors in a raceway must be protected from water entering the raceway at the service head by:

Accepted Answer

Conductors formed in a drip loop

Answer

A weatherhead pointed upward

Answer

Sealing fittings

Answer

A watertight junction box

Question 5

The minimum size copper grounded conductor for a 400-ampere service with 500 kcmil copper ungrounded conductors is:

Accepted Answer

1/0 AWG

Answer

2 AWG

Answer

3/0 AWG

Answer

250 kcmil

Question 6

Which of the following is NOT a permitted wiring method for a branch circuit supplying a swimming pool pump motor?

Accepted Answer

Type NM cable

Answer

Rigid PVC conduit

Answer

Liquidtight flexible nonmetallic conduit

Answer

Rigid metal conduit

Question 7

A branch circuit rated at 15 amperes is supplying only lighting. The maximum load permitted on this circuit is:

Accepted Answer

1,440 watts

Answer

1,500 watts

Answer

1,725 watts

Answer

1,800 watts