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Branch Circuit Requirements Flashcards

7 cards from real NEC practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Branch Circuit Requirements flashcards as text

  1. What is the maximum overcurrent protection allowed on a 14 AWG copper branch circuit conductor?

    Answer: 15 amperes

    Per NEC 240.4(D), 14 AWG copper is limited to 15-ampere overcurrent protection.

  2. A 20-ampere branch circuit supplying receptacles requires conductors of at least which size copper?

    Answer: 12 AWG

    A 20-amp circuit requires 12 AWG copper conductors per NEC 240.4(D).

  3. On a multi-outlet branch circuit, the rating of any single cord-and-plug-connected utilization equipment must not exceed what percentage of the branch-circuit rating?

    Answer: 80%

    NEC 210.23(A)(1) limits a single plug-connected load to 80% of the branch-circuit rating.

  4. What is the maximum rating of a branch circuit permitted to supply standard 15-ampere receptacles when more than one receptacle is on the circuit?

    Answer: 20 amperes

    Per NEC Table 210.21(B)(3), 15-amp receptacles may be used on a 20-amp circuit with multiple outlets.

  5. Branch circuits rated 30 amperes are permitted to supply which type of load in a dwelling unit?

    Answer: Fixed appliances and equipment only

    NEC 210.23(B) limits 30-amp circuits to fixed equipment, not general-use receptacles in dwellings.

  6. Conductors of a branch circuit must have an ampacity not less than the maximum load to be served and not less than what for continuous loads?

    Answer: 125% of the continuous load

    NEC 210.19(A) requires branch-circuit conductors to be sized at 125% of continuous load.

  7. What is the minimum branch-circuit conductor size permitted for a 40-ampere branch circuit using copper?

    Answer: 8 AWG

    A 40-amp branch circuit requires 8 AWG copper conductors per the ampacity tables.