Hi all,
I need help trying to size solid core conductor wiring for 3 phase current.
Let us assume the following:
1 - A resistive load with a power factor of 1
2 - 10.4 kW of power
3 - P/P Voltage of 380V, P/N voltage of 220V.
My kVA in this case is 10.4 since pf is 1. As a result, current per phase is I = Power / (sq. root of 3 x pf x P/P V), so I = 10400 / (1.732 x 1 x 380) or approximately 15.8 Amps, say 16 Amps.
Do I size my wire according to the current per 1 phase? Ie 16 Amps? Or do I size it according to all 3 phases, ie 48 Amps? I guess since not all the current flows at the same time through the Neutral, since they are 120 deg out of phase, I would be sizing for something closer to 16 Amps.
Thanks,