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Am i doing this correct,if i had a 3 phase 480 volt lighting panel with 50 kva connected loads of 277 volt lighting, continuous duty and i want to find out what size feeder i needer for thsi panel. 50kva x 1000=50000va,
50000va/480v=104.16666/1.732=60.142413 x 1.25= 76 amp
So i would need #4 copper for this installation?
So even though you have single phase loads in the panel you calculate the feeder as a three phase load?
Am i doing this correct,if i had a 3 phase 480 volt lighting panel with 50 kva connected loads of 277 volt lighting, continuous duty and i want to find out what size feeder i needer for thsi panel. 50kva x 1000=50000va,
50000va/480v=104.16666/1.732=60.142413 x 1.25= 76 amp
So i would need #4 copper for this installation?
So even though you have single phase loads in the panel you calculate the feeder as a three phase load?