Electrician National Electrical Code (NEC)

Question 1

According to the NEC, what is the minimum burial depth for rigid metal conduit (RMC) under a residential driveway?

Accepted Answer

12 inches

Answer

The NEC requires RMC to be buried at least 6 inches under a residential driveway, but 12 inches is required under most other conditions.

Question 2

What NEC article covers general requirements for wiring methods?

Accepted Answer

Article 300

Answer

NEC Article 300 covers general requirements for all wiring methods and materials.

Question 3

Per the NEC, GFCI protection is required for all 125-volt, single-phase, 15- and 20-ampere receptacles in which location?

Accepted Answer

Bathrooms

Answer

The NEC mandates GFCI protection for all receptacles in bathrooms due to the proximity of water.

Question 4

What is the maximum number of current-carrying conductors permitted in a single conduit before derating is required under the NEC?

Accepted Answer

3

Answer

The NEC allows up to 3 current-carrying conductors before ampacity derating applies per NEC 310.15(C).

Question 5

According to the NEC, what color must the grounded (neutral) conductor be identified as?

Accepted Answer

White or gray

Answer

The NEC requires the grounded (neutral) conductor to be white or gray for identification.

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