Breaker size
Breaker size
(OP)
Everyone,
I have an existing MCC Panel.
One of the branches is 400A breaker feeding another MCC in other building Which its main incoming breaker is 500A.
Does anybody can see a reason behind that?
what If the total current of second MCC is more than 400?
Regards,
I have an existing MCC Panel.
One of the branches is 400A breaker feeding another MCC in other building Which its main incoming breaker is 500A.
Does anybody can see a reason behind that?
what If the total current of second MCC is more than 400?
Regards,






RE: Breaker size
Mike
RE: Breaker size
Typically the circuit breakers on the destination side of branches are rated less than the source so that the breaker closest to the problem blows first.
RE: Breaker size
RE: Breaker size
RE: Breaker size
RE: Breaker size
I have seen older facilities where the 500A CB is a molded case switch so that only one CB has to be reset. These usually have to be replaced because of the low withstand ratings of molded case switches.