How many kilowatts will a motor use in 30 days if it runs constantly It is 460 volt and pulls 120 amps 3 phase?

In order to determine power from volts and amps, we need to know the power factor and efficiency, but the question did not provide that information, so I will make an educated guess that the efficiency is 0.95 and the power factor is 0.92. The actual motor nameplate ratings will have to factor into the real calculations.

460 V times 120 A is 55.2 KVA. The question did not say, but it is assumed that the 120 A is per phase, so divide by 1.732 (square root of 3) to get winding power of 31.9 KVA, and then multiply by 3 to get total winding power of 95.6 KVA. Multiply by 0.92 and 0.95 to get power in watts of 83.6 KW.

If you want to know kilowatt-hours for 30 days, multiply by 30 and 24 to get 60.2 mega watt-hours.