Multiply the AC voltage by the motor efficiency, the power factor and the square root of 3. For example, if the motor is 

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requirements for Motor Branch circuit and Short-Circuit. Protection. Selecting Fuses for Motor Running Protection. Based on Motor Horsepower.

Enter the motor rated voltage in volts (V) Enter the motor power rating and select the appropriate unit (HP or kW) Enter the power factor and efficiency of the motor. Click on the "Calculate" button to see the results. Note: Please note that this calculator is provided for information purposes only. Typically, the FLA value is shown on the

Oct 25,  · One horsepower (electric motor) is 746 watts, so ten horsepower is 7460 watts. Divide that by a power factor (assumed) of 0.8 and you get 9325 volt-amps. Divide that by a voltage (again, assumed) of 240 and you get 39 amperes. For calculation purposes the electrical code book states that a 10 horsepower motor at 240 volts will draw 50 amps.

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Pete, Actually it was 8 spokes in an 8 pole motor and it seems it only occurs when the number of spokes equal the number of poles. It is a little confusing when they use an 8 pole motor and show a diagram of 4 spokes. But they do go on to state that it was confirmed to be 8 spokes in the rotor. Ronnie

AC current is calculated by the power factor of 0.86 for single-phase supply and 0.8 for three-phase supply. Look at the table the 1 hp motor takes will be 1.3 A at 440 Volts three-phase at

HP 208 Volts 230 Volts 460 Volts 1/2 2.4 2.2 1.1 3/4 3.5 3.2 1.6 1 4.6 4.2 2.1

Caution: The actual motor amps may be higher or lower than the average values listed above. For more reliable motor protection, use the actual motor current as listed on the motor