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I was wondering if anyone can help me figure out how much voltage drop is happening in this particular scenario.

Here is my work:

Given 200HP motor at 480V that is 300 ft. away from the starter.

%VD(3phase) = [12(1.73)(300ft.)(240A)]/[(Circular mil) * (480V)] x100

I use 12 for copper, and with 200HP the Full Load Amp is 240A.

I have no idea where i can get the circular mil. Can someone please help me. I know that it's somewhere in the NEC.

thanks.

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# Voltage drop

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