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Voltage drop

  1. Jul 9, 2006 #1

    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.

  2. jcsd
  3. Jul 9, 2006 #2
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