Licensed Electrical Contractor Licensed Electrical Contractor Wiring Methods and Materials Questions and Answers 2

Question 1

What is the maximum number of conductors permitted in a single raceway before derating factors must be applied according to NEC Table 310.15(C)(1)?

Accepted Answer

3 current-carrying conductors

Answer

2 conductors

Answer

4 current-carrying conductors

Answer

6 current-carrying conductors

Question 2

Which wiring method is specifically required for circuits supplying fire pumps per NEC Article 695?

Accepted Answer

Type MC cable listed for the application

Answer

Type NM cable

Answer

Type UF cable

Answer

Flexible metal conduit

Question 3

What is the minimum burial depth for rigid metal conduit (RMC) installed under a one-family dwelling driveway?

Accepted Answer

18 inches

Answer

6 inches

Answer

12 inches

Answer

24 inches

Question 4

When installing EMT in a wet location, what type of fittings must be used?

Accepted Answer

Compression fittings listed for wet locations

Answer

Set-screw fittings

Answer

Indenter fittings

Answer

Any listed EMT fitting

Question 5

What is the maximum percentage of conduit fill permitted for three or more conductors installed in a raceway per NEC Chapter 9, Table 1?

Accepted Answer

40%

Answer

31%

Answer

53%

Answer

60%

Question 6

Which conductor material requires the use of an antioxidant compound at termination points?

Accepted Answer

Aluminum

Answer

Copper

Answer

Both copper and aluminum

Answer

Neither copper nor aluminum