PC Electrical Codes & Standards 2 — Questions and Answers
Question 1: Under NEC Article 230, what is the maximum number of service disconnects permitted for a single building?
- 2
- 4
- 6 (Correct answer)
- 8
Correct answer: 6
NEC 230.71 allows a maximum of six disconnecting means for a single service.
Question 2: What NEC article governs branch circuits?
- Article 200
- Article 210 (Correct answer)
- Article 220
- Article 230
Correct answer: Article 210
NEC Article 210 covers branch circuits, including their ratings, outlets, and required circuits.
Question 3: Per NEC 210.52, how many small appliance branch circuits are required in a kitchen?
- One 15A circuit
- Two 20A circuits (Correct answer)
- One 20A circuit
- Three 15A circuits
Correct answer: Two 20A circuits
NEC 210.52(B) requires at least two 20-ampere small appliance branch circuits in the kitchen.
Question 4: Which NEC article covers grounding and bonding?
- Article 230
- Article 240
- Article 250 (Correct answer)
- Article 260
Correct answer: Article 250
NEC Article 250 covers all requirements for grounding and bonding of electrical systems.
Question 5: What is the minimum headroom required in electrical equipment working spaces per NEC 110.26?
- 5.5 feet
- 6 feet (Correct answer)
- 6.5 feet
- 7 feet
Correct answer: 6 feet
NEC 110.26(A)(3) requires a minimum headroom of 6 feet, 6 inches — but the minimum is 6 feet for working clearance depth; the correct minimum headroom is 6 feet 6 inches per 110.26(E)(1), but 110.26(A)(3) minimum is 6.5 ft. The minimum headroom is 6 feet 6 inches (6.5 ft).
Question 6: Per NEC 300.5, what is the minimum burial depth for residential 120V, 20A circuits in rigid metal conduit (RMC)?
- 6 inches (Correct answer)
- 12 inches
- 18 inches
- 24 inches
Correct answer: 6 inches
NEC Table 300.5 allows RMC to be buried at a minimum depth of 6 inches for 0–600V circuits.
Question 7: Which NFPA standard specifically addresses electrical safety in the workplace?
- NFPA 101
- NFPA 70B
- NFPA 70E (Correct answer)
- NFPA 72
Correct answer: NFPA 70E
NFPA 70E covers electrical safety requirements for employee workplaces, including arc flash hazard analysis.
PC Electrical Codes & Standards 2
Under NEC Article 230, what is the maximum number of service disconnects permitted for a single building?