E2 NEC Compliance 2 — Questions and Answers
Question 1: Under NEC Article 230, what is the maximum number of service disconnects permitted for a single commercial occupancy?
- 2
- 4
- 6 (Correct answer)
- 8
Correct answer: 6
NEC 230.71 allows a maximum of six service disconnects for a single commercial occupancy grouped in one location.
Question 2: NEC 210.19(A) requires that branch circuit conductors have an ampacity of at least what percentage of the continuous load they serve?
- 100%
- 115%
- 125% (Correct answer)
- 150%
Correct answer: 125%
Conductors must be sized at 125% of the continuous load to account for heat buildup under sustained operation.
Question 3: According to NEC 450.13, a dry-type transformer rated 112.5 kVA or less must have a minimum clearance of how many inches from combustible material?
- 6 inches
- 12 inches (Correct answer)
- 18 inches
- 24 inches
Correct answer: 12 inches
NEC 450.13(A) requires at least 12 inches of separation between a dry-type transformer and combustible material unless the transformer is separated by a fire-resistant, heat-insulating barrier.
Question 4: NEC 700.12 requires emergency system sources to supply full load within how many seconds of normal power failure?
- 5 seconds
- 10 seconds (Correct answer)
- 15 seconds
- 30 seconds
Correct answer: 10 seconds
Emergency systems must restore power within 10 seconds of normal source failure per NEC 700.12.
Question 5: Under NEC 404.2(C), a switch controlling a lighting outlet in a bathroom of a commercial occupancy must be located where?
- Outside the bathroom
- Inside the bathroom, away from the tub or shower (Correct answer)
- Adjacent to the panel
- At the entrance to the building
Correct answer: Inside the bathroom, away from the tub or shower
NEC 404.2(C) permits switches inside bathrooms if they are not within reach of a tub or shower.
Question 6: NEC 517.13 requires that patient care areas in healthcare facilities have what special grounding provision for receptacles and fixed equipment?
- Double-pole GFCI protection
- An insulated equipment grounding conductor in addition to the metallic raceway path (Correct answer)
- Isolated ground receptacles throughout
- AFCI protection on all circuits
Correct answer: An insulated equipment grounding conductor in addition to the metallic raceway path
NEC 517.13 mandates a redundant grounding path: both the metal raceway and an insulated EGC must be present to ensure continuity in patient care areas.
Question 7: According to NEC 225.30, a commercial building may have a maximum of how many feeder or branch circuit supplies from outside the building?
- One (Correct answer)
- Two
- Four
- Six
Correct answer: One
NEC 225.30 limits outside feeder or branch circuit supplies to one per building or structure, with specific listed exceptions.
E2 NEC Compliance 2
Under NEC Article 230, what is the maximum number of service disconnects permitted for a single commercial occupancy?