Wiring Methods and Installation Flashcards

According to NEC Table 300.5, what is the minimum burial depth for Type UF cable used for a 120/240V residential branch circuit?

Answer: 12 inches

NEC Table 300.5 requires Type UF cable to be buried a minimum of 12 inches deep for residential branch circuits.

Under NEC 300.4(A)(1), where cables pass through bored holes in wood framing, the edge of the hole must be at least how far from the nearest edge of the wood member (or a steel protective plate must be installed)?

Answer: 1-1/4 inches

NEC 300.4(A)(1) requires the edge of bored holes to be at least 1-1/4 inches from the nearest edge of the wood member to protect cables from nails and screws.

According to NEC 334.30, Type NM cable must be secured within how many inches of every cabinet, box, or fitting it enters?

Answer: 12 inches

NEC 334.30 requires NM cable to be secured within 12 inches of every cabinet, box, or fitting.

According to NEC 334.30, what is the maximum interval for securing and supporting Type NM cable in exposed locations?

Answer: 4.5 feet

NEC 334.30 requires NM cable to be secured and supported at intervals not exceeding 4.5 feet in exposed locations.

Which of the following wiring methods is NOT permitted in wet locations?

Answer: Type NM cable

Type NM cable is prohibited in wet or damp locations per NEC 334.12; RMC, IMC, and LFMC are all listed for use in wet locations.

Under NEC 300.22(C), wiring installed in a plenum ceiling space used for air handling must:

Answer: Use only plenum-rated cables or wiring enclosed in metal conduit

NEC 300.22(C) requires that wiring in air-handling plenums use listed plenum-rated cables or be installed in metal conduit to limit smoke spread.

What does NEC 300.15 require at each point where conductors are spliced or terminated?

Answer: A box, conduit body, or fitting must be installed at each splice or termination point

NEC 300.15 requires a box, conduit body, or fitting to be installed at each point where conductors are spliced or terminated.