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Equipment for General Use 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. When sizing branch-circuit conductors for a general-purpose motor, NEC 430.6(A)(1) requires the full-load current to be taken from:

    Answer: NEC Tables 430.247 through 430.250

    NEC 430.6(A)(1) requires using the table full-load currents, not nameplate values, to size conductors and short-circuit/ground-fault protection.

  2. A continuous-duty motor rated over 1 hp has a marked service factor of 1.15. What is the maximum overload protection rating per NEC 430.32(A)(1)?

    Answer: 125% of nameplate FLA

    NEC 430.32(A)(1) allows overloads up to 125% of nameplate full-load current for motors with a service factor of 1.15 or greater.

  3. Per Table 430.52, what is the maximum rating of an inverse time circuit breaker for branch-circuit short-circuit and ground-fault protection of a single-phase squirrel-cage motor (design other than E)?

    Answer: 250% of FLC

    Table 430.52 allows inverse time breakers at up to 250% of the table full-load current for these motors.

  4. Feeder conductors supplying three motors must have an ampacity of at least which value per NEC 430.24?

    Answer: 125% of the largest motor FLC plus the sum of the other motor FLCs

    NEC 430.24 requires 125% of the highest-rated motor's FLC plus the sum of the remaining motors' FLCs, plus other loads.

  5. Branch-circuit conductors supplying a single hermetic refrigerant motor-compressor must have an ampacity of at least what percentage of the rated-load current or branch-circuit selection current, whichever is greater (NEC 440.32)?

    Answer: 125%

    NEC 440.32 requires conductor ampacity of at least 125% of the larger of rated-load current or branch-circuit selection current.

  6. The ampacity of conductors from generator terminals to the first overcurrent device must be at least what percentage of the generator nameplate current rating per NEC 445.13?

    Answer: 115%

    NEC 445.13(A) requires generator output conductors to have an ampacity of not less than 115% of the nameplate current rating.

  7. For capacitors rated 1000 volts or less, NEC 460.6(A) requires the residual voltage to be reduced to what level within what time after disconnection?

    Answer: 50 volts within 1 minute

    NEC 460.6(A) requires capacitors rated 1000 V or less to discharge to 50 volts nominal or less within 1 minute.