NECA Electrical Code & Standards 3 — Questions and Answers
Question 1: According to NEC 404.2(C), a grounding conductor must be provided at switch locations where switches control lighting in certain locations. Which location specifically triggers this requirement?
- Attached garage
- Unfinished basement
- Bathroom (Correct answer)
- Kitchen
Correct answer: Bathroom
NEC 404.2(C) requires an equipment grounding conductor at switch locations in bathrooms, as well as garages and outdoor locations.
Question 2: Under NEC 314.16, the volume allowance for a No. 12 AWG conductor used when calculating box fill is:
- 2.0 cubic inches
- 2.25 cubic inches (Correct answer)
- 3.0 cubic inches
- 2.5 cubic inches
Correct answer: 2.25 cubic inches
NEC Table 314.16(B) assigns 2.25 cubic inches per No. 12 AWG conductor for box fill calculations.
Question 3: Which NEC article covers the installation requirements for transformers rated 600V or less?
- Article 408
- Article 450 (Correct answer)
- Article 430
- Article 460
Correct answer: Article 450
NEC Article 450 covers the installation of transformers, including those rated 600V or less.
Question 4: Per NEC 300.14, at least how much free conductor must be left at each outlet, junction, and switch point?
- 4 inches
- 6 inches (Correct answer)
- 8 inches
- 12 inches
Correct answer: 6 inches
NEC 300.14 requires at least 6 inches of free conductor measured from the point where it emerges from the raceway or cable sheath.
Question 5: What is the NEC term for the low-impedance path intended to facilitate overcurrent device operation in the event of a ground fault?
- Ground electrode conductor
- Equipment grounding conductor
- Effective ground-fault current path (Correct answer)
- Grounded conductor
Correct answer: Effective ground-fault current path
NEC Article 100 defines the 'effective ground-fault current path' as the intentionally constructed low-impedance path from the fault point to the electrical supply source.
Question 6: Under NEC 210.8(A), GFCI protection is required for 125-volt, 15- and 20-amp receptacles in which dwelling unit location?
- Living room
- Hallway
- Crawl space (Correct answer)
- Bedroom
Correct answer: Crawl space
NEC 210.8(A)(4) requires GFCI protection for receptacles in crawl spaces at or below grade level.
Question 7: When conductors of different systems (e.g., 120V and 277V) are installed in the same raceway, NEC 300.3(C)(1) requires they be:
- Separated by a metal barrier
- Insulated for the highest voltage present (Correct answer)
- Color-coded differently only
- Installed in separate conduits
Correct answer: Insulated for the highest voltage present
NEC 300.3(C)(1) requires all conductors in the same raceway to be insulated for the maximum voltage present in that raceway.
NECA Electrical Code & Standards 3
According to NEC 404.2(C), a grounding conductor must be provided at switch locations where switches control lighting in certain locations.
Which location specifically triggers this requirement?