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Conductors per phase

  1. Mar 11, 2012 #1


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    How do you determine the number of conductors per phase?

    From my understand, the full load amperage divided by the desired wire size's ampacity rounded up if there is a remainder.

    An example: If I have a 361 Full load Amp motor from the NEC table and I calculated the motor circuit conductor protection, which the specs of the motor 300 HP, 3 Phase, 60 Hz, 480V. 125 % x 361 Amps is 451 Amps. Which Amp would I chose to divide my desire wire? I would assume to use the 451 Amps for overload protection, but the calculations don't look right if I use 600MCM/kcmil wire.
  2. jcsd
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