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1 phase AC 115V 1 HP motor full load current calc.

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  1. davidb
    davidb is offline Junior Member Posted May 2, 2018 Pro Subscriber
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    1 phase AC 115V 1 HP motor full load current calc.

    The full load current for a single phase alternating current 115 volt, 1 horsepower motor is?

    My answer was 8 Amps based on formula when Horsepower & Voltage are known factors.

    Horsepower X 746
    Amps = _________________________

    Volts X Efficiency X Power Factor


    Correct answer indicates 16 Amps based on NEC Table 430.248.

    Do we need to remember numerous Tables or need to know how to calculate such questions?
    Thank-you
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