Electrician National Electrical Code (NEC) 1 — Questions and Answers
Question 1: According to the NEC, what is the minimum burial depth for rigid metal conduit (RMC) under a residential driveway?
- 6 inches
- 12 inches (Correct answer)
- 18 inches
- 24 inches
Correct answer: 12 inches
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?
- Article 100
- Article 200
- Article 300 (Correct answer)
- Article 400
Correct answer: Article 300
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?
- Living rooms
- Bedrooms
- Bathrooms (Correct answer)
- Hallways
Correct answer: Bathrooms
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?
- 2
- 3 (Correct answer)
- 4
- 6
Correct answer: 3
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?
- Green
- Bare copper
- White or gray (Correct answer)
- Black
Correct answer: White or gray
The NEC requires the grounded (neutral) conductor to be white or gray for identification.
Question 6: What NEC article governs the installation of electric vehicle charging systems?
- Article 410
- Article 422
- Article 625 (Correct answer)
- Article 700
Correct answer: Article 625
NEC Article 625 covers all aspects of electric vehicle charging system installations.
Electrician National Electrical Code (NEC) 1
According to the NEC, what is the minimum burial depth for rigid metal conduit (RMC) under a residential driveway?