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View Full Version : What is the primary amprage of a 15 kva 480 volt 3 phase transformer?

omar2792
Jan 5, 2012, 09:48 AM
What is the primary amprage of a 3 phase 15 KVA 480 volt transformer
cvander
Jan 8, 2012, 10:43 PM
15kva*1000=15000va

15000/480v*1.732(3phase)
15000/831.36
P amps=18.04A
Breaker size P amps 18.04A*125% = 22.55Amp