NEC Wiring and Protection Flashcards

Per NEC 404.2(C), a grounded conductor (neutral) is required at switch locations for what purpose?

Answer: To supply power for electronic dimmer switches and timers

NEC 404.2(C) requires a grounded conductor at switch locations to provide a return path for electronic switches, dimmers, and occupancy sensors.

What is the minimum burial depth for rigid nonmetallic conduit (PVC) under a residential driveway per NEC Table 300.5?

Answer: 12 inches

NEC Table 300.5 requires PVC conduit to be buried at least 12 inches under a residential driveway.

Which NEC section requires GFCI protection for receptacles in bathrooms of dwelling units?

Answer: NEC 210.8(A)(1)

NEC 210.8(A)(1) requires all 125-volt, 15- and 20-ampere receptacles in bathrooms of dwelling units to have GFCI protection.

Under NEC 300.4(A), when bored holes in wooden studs for cables are less than 1-1/4 inches from the edge, what is required?

Answer: A steel nail plate at least 1/16 inch thick

NEC 300.4(A)(1) requires a steel plate at least 1/16 inch thick to protect cables bored through wood members where the edge clearance is less than 1-1/4 inches.

How many current-carrying conductors trigger the first ampacity adjustment factor under NEC 310.15(C)(1)?

Answer: More than 3

NEC 310.15(C)(1) requires ampacity adjustment when more than 3 current-carrying conductors are bundled or installed in a raceway.

Per NEC 250.122, the equipment grounding conductor size is based on:

Answer: The rating of the overcurrent protective device

NEC 250.122 and Table 250.122 size the equipment grounding conductor based on the rating of the overcurrent device protecting the circuit.

What NEC article covers armored cable (Type AC)?

Answer: Article 320

NEC Article 320 covers Armored Cable (Type AC), including permitted uses, installation requirements, and fittings.