Answer / me
iam working in an out door lighting design for our plant
and i calculated the total watt needed (sum of all lights)
= 53 kw, 220 volt
our power supply is 480V
so, I chosed a 75 KVA transformer dry type 480/220-127 V 3
phase 60 Hz
cable size from feeder to transformer primary = 50 mm2 (1/0
cable size from transformer secondary to distribution panel
board = 125 mm2 (250 MCM)
distribution panel board main breacker = 250 A
So, are my calculations ok ? any changes or suggestions ?
thanks in advance
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