Maximum breaker allowable in main circuit breaker panel

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K8MHZ

Senior Member
Location
Michigan. It's a beautiful peninsula, I've looked
Occupation
Electrician
On the basis of common sense, I'd ask what the hazard would be, especially if the inverter were underloaded and would likely seldom if ever reach its rated maximum output and the AC conductors from the inverter to the breaker were sized according to code. It seems to me that the worst thing that could happen would be an occasional (if ever) nuisance trip of the backfed breaker, and if the customer were to be OK with that, where's the beef?

I guess for the same reason we size breakers for things like ranges that will seldom, if ever, be used at their fullest potential.

Remember, the purpose of an OCPD is to operate during a fault, not to limit the current of a properly functioning over sized device.
 
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