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Conductors per phase

by Dwa
Tags: conductors, phase
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Dwa
#1
Mar11-12, 01:59 AM
P: 4
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.
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