Answer Posted / maze one

S = I x V x sq. root of 3
where:
S = Apparent Power, VA
I = Current, A
V = Voltage, V
note : use sq. root of 3 if the system is 3 phase

let's say Voltage = 460V @ Secondary Side
I = (500,000 VA)/(460V)(sq. root of 3)

I = 1,882.66 A

you may multiply the safety factor by 125% to 250%
or using inversed time circuit breaker by 250%

I will use 125% only, that is safe
I = 1882.66 x 125%

I = 2,353.325 AT

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