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In an MCC, Incomer feeder rating is 350A(from PCC) but feeder of MCC include 75KW,20KW Motor & two 150A spare?
As feeder rating from MCC outgoing exceeds the incomer(350A)? Can somebody please explain?
Main Feeder Breaker -- 350 amperes
Outgoing load side ACB are:2- 150 Amperes.
Current for 75 Kw motor at 0.8 P.F. and 415volts:
I =75(1000)/1.732(415)(0.8)
=130. Amperes.
Current for 20 Kw motor at 0.8P.F. and 415 Volts
I =20(1000)/1.732(415)(0.8)
I = 34.78
Main Feeder ACB =2.5(130) +34.78
=359.78 slightly higher than 350. but, 350 amperes won't trip because starting current of 75 Kw motor may be 2(130) only+34.78 =254.78 Amperes.
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