NECA Electrical Code & Standards 2 — Questions and Answers
Question 1: Under the NEC, what is the minimum burial depth for a residential branch circuit rated 120V GFCI-protected installed 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 burial at 6 inches for 120V GFCI-protected residential branch circuits.
Question 2: Which NEC article governs the installation of electrical systems in hazardous (classified) locations using Zone equipment designation?
- Article 500
- Article 501
- Article 505 (Correct answer)
- Article 510
Correct answer: Article 505
NEC Article 505 covers Class I Zone 0, Zone 1, and Zone 2 hazardous locations using the IEC Zone system.
Question 3: According to NEC 210.52, how many small-appliance branch circuits are required for kitchen countertop receptacles in a dwelling unit?
- One 15-amp circuit
- At least two 20-amp circuits (Correct answer)
- One 20-amp circuit
- Three 15-amp circuits
Correct answer: At least two 20-amp circuits
NEC 210.52(B)(1) requires at least two 20-amp small-appliance branch circuits for countertop receptacles in the kitchen.
Question 4: What is the maximum distance from a water heater that a disconnect means must be located per NEC 422.31(B)?
- In sight from the appliance (Correct answer)
- Within 50 feet
- In the adjacent room
- At the panelboard only
Correct answer: In sight from the appliance
NEC 422.31(B) requires a disconnecting means within sight of the water heater unless it is lockable in the open position.
Question 5: Per NEC 230.24(B), service-entrance conductors must maintain a minimum clearance of how many feet above a residential roof with a slope of 4 in 12 or greater?
- 8 feet
- 3 feet (Correct answer)
- 10 feet
- 18 inches
Correct answer: 3 feet
NEC 230.24(B)(1) allows a 3-foot clearance above a roof with a slope of 4 in 12 or greater.
Question 6: Which NFPA standard specifically addresses electrical safety requirements for employee workplaces and is closely referenced alongside the NEC by NECA members?
- NFPA 70B
- NFPA 70E (Correct answer)
- NFPA 72
- NFPA 101
Correct answer: NFPA 70E
NFPA 70E covers electrical safety in the workplace and is the standard for arc flash and shock hazard protection for workers.
Question 7: Under NEC 250.122, if a circuit breaker is increased in size for motor starting purposes, what must also be increased proportionally?
- The grounded conductor size
- The equipment grounding conductor size (Correct answer)
- The conduit size
- The neutral conductor size
Correct answer: The equipment grounding conductor size
NEC 250.122(B) requires that when the overcurrent device is increased, the equipment grounding conductor must be proportionally increased in size.
NECA Electrical Code & Standards 2
Under the NEC, what is the minimum burial depth for a residential branch circuit rated 120V GFCI-protected installed in rigid metal conduit (RMC)?