Main circuit breaker derate

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Carultch

Senior Member
Location
Massachusetts
When debating MCB. Does it still need to meet 125% requirement of total house load?

Derating, not debating. You either need to supply a building load calculation, either the standard or simplified method, as you would ordinarily use for sizing a service OCPD, when determining if it is allowed to select a smaller main breaker. Or you need 15-minute recording meter interval data for 30 days.
 
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