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Code Basic 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.

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  1. What is the standard nominal voltage of a typical U.S. residential branch circuit for general lighting and receptacles?

    Answer: 120 volts

    General lighting and receptacle branch circuits in U.S. dwellings are typically 120 volts nominal.

  2. Which color is required by the NEC for the grounded (neutral) conductor of a 120/240V system?

    Answer: White or gray

    The NEC requires the grounded (neutral) conductor to be identified by white or gray.

  3. What color is reserved by the NEC for the equipment grounding conductor?

    Answer: Green, green with yellow stripe, or bare

    Equipment grounding conductors must be green, green with a yellow stripe, or bare.

  4. A standard 15-amp, 120V branch circuit using copper conductors typically requires what minimum wire size?

    Answer: 14 AWG

    14 AWG copper is the minimum size generally permitted for a 15-amp branch circuit.

  5. A standard 20-amp, 120V branch circuit using copper conductors typically requires what minimum wire size?

    Answer: 12 AWG

    12 AWG copper is the minimum size generally required for a 20-amp branch circuit.

  6. What device does the NEC require to protect against ground faults in dwelling bathroom receptacles?

    Answer: GFCI

    Ground-Fault Circuit-Interrupter (GFCI) protection is required for bathroom receptacles in dwellings.

  7. Which protective device does the NEC require for many dwelling-unit branch circuits to guard against arcing faults?

    Answer: AFCI

    Arc-Fault Circuit-Interrupter (AFCI) protection is required for many dwelling-unit branch circuits to reduce fire risk from arcing.