Usethe following formula: KVA x 1000. Line to Line voltage x 1.732. For a 120/208v three phase 100 KVA tranformer we calculate the full load ampacity as follows: 100 x 1000. 208 x 1.732. That gives us 277.58 amps. So, for a 100 KVA 120/208v three phase transformer the full load ampacity is 277.58 amps. Incase of an alternating current, the 40 amps watts transformation is different for a single-phase and three-phase system. However, the power factor is needed for both. How many watts is 40 amps at 240 volts, for instance, has a single answer for direct current (DC), yet three possible results in case of alternating current (AC). Soyou always need a bigger wire than you might think for motors. If you have say a 6kW load motor), that's 2kW per phase, divide by 240 equals about 8 amps, divide by your power factor (cos phi) [say 0.8] equals 10 amps. (in each of the three wires) If it was a heating load, cos phi is 1 so the answer would be 8 amps. P(kW) = (I (Amps) × V (Volts) × PF × 1.732) ÷ 1,000. I even found that PF is basically phase shift between current and voltage sine. The only thing I don't get is which current and voltage to use here - I have three of each. Singlephase to 3 phase power calculation input requirement = The square root of 3 (1.732) x 10 amps. = 1.732 x 10 amps. = 17.32 Amps. Single phase power input in this instance is 17.32 Amps. The total load draw should not be any higher than the rated motor load, assuming the motor is appropriately rated for the work to be performed. . #5. The capacity of a 200 amp is 200 amps at 240 volts or 400 amps at 120 volts. It really depends on the specifics of the question you're asking. For example, a 2400 watt load @ 120 volts will produce a load of 20 amps. A 4800 watt load @ 240 volts will produce a load of 20 amps. od6i8O.

how many amps in 3 phase power