If the t/f capacity is 500KvA then what is Amps ratting of
the main breaker.
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Answer Posted / athar abid
As we Know that
KVA = Sqrt 3 . Voltage(V) . Current(I)
Now for 400V (Phase-Phase) syayem
I = 500KVA/(1.732 * 400)
=500*1000/(1.732*400)
=721.7 Amps
There is no standard breaker available with this rating, so
take one step above rating i.e. 800Amps
Hope its clear.
Regards
Athar Abid
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