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Breaker is larger than MOCP?

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wikiele

New User
Location
Canada
Occupation
Journeyman Electrician
I'm a little confused and wondering if anyone can provide insight. I have a building with a chiller that has a data plate listing an MOCP of 250A (MCA of 212A). However, the breaker feeding it from the building switchgear is 400A. Drawings in the room note a 300A breaker and 250MCM. I understand MOCP is a maximum you can't exceed. Not sure what's happening here?
 
augie47

augie47

Moderator
Staff member
Location
Tennessee
Occupation
State Electrical Inspector (Retired)
Is the breaker feeding the chiller itself or a disconnect at the chiller ?
 
E

Eddie702

Licensed Electrician
Location
Western Massachusetts
Occupation
Electrician
Chillers are often sold with or without a factory disconnect. Unless there are fuses in the chiller in the main feed or a breaker that sounds like a violation.

MOCP your right it cannot be exceeded.
 
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