How must the conductors of one circuit, including the grounded and equipment grounding conductors, be routed?
- In separate raceways for each of the phases
- With the neutral run in its own raceway
- By any route that ends at the same box
- Together in the same raceway, cable or trench
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D. Together in the same raceway, cable or trench
All conductors of a circuit are kept together in the same raceway, cable, trench or cord. Keeping them together cancels magnetic fields and keeps the fault path impedance low.
Reference: NEC 2023, 300.3(B)
A hole is bored through a wood stud for NM cable. If no steel plate is used, the edge of the hole must be at least how far from the nearest edge of the stud?
- 3/4 in.
- 1 in.
- 1-1/4 in.
- 1-1/2 in.
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C. 1-1/4 in.
The hole edge must be at least 1-1/4 in. from the nearest edge of the framing member, or a steel plate must protect the cable. That depth keeps normal drywall screws and nails from reaching the cable.
Reference: NEC 2023, 300.4(A)(1)
What is the minimum cover for Type UF cable buried directly in a yard, with no reduction for GFCI protection or other conditions?
- 6 in.
- 12 in.
- 18 in.
- 24 in.
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D. 24 in.
Direct-buried cables need 24 in. of cover in the general case. The 18 in. depth is for nonmetallic raceways such as PVC, and 6 in. is for rigid or intermediate metal conduit.
Reference: NEC 2023, 300.5(A)