Motor Amperage

The full load currents listed in this calculator below are average values for horsepower rated motors of several manufacturers at the more common rated voltages and speeds. These average values, along with the similar values listed in the U.S. National Electrical Code (NEC), should be used only as a guide for selecting suitable components for the Motor Branch Circuit. The actual rated full load current, shown on the motor nameplate, may vary considerably from the listed value depending on the specific motor design. The motor nameplate full load current should always be used in determining the rating of the devices used for Motor Running Overcurrent Protection.

Motor Amperage Calculator
Motor type Single Phase Three Phase Voltage volts A/C Motor horsepower HP	Estimated Full Load Current - Minimum Copper Wire Size (75°C) THW, THHN-THWN, XHHW - Magnetic Breaker Trip Rating - Fused Disconnect -

Shipco® MathWizard™ • Go to Top