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Question DetailsAsked on 4/16/2020

I have a 150amp electrical service and my breakers sum up to 420amps. Can I add more?

I would like to add dedicated circuit for a piece of machinery requiring a circuit breaker size of 25A, 110v or 15A, 220V.
I would also like to add another circuit for a garage a/c unit.

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1 Answer


The correct answer is to perform a load calculation as specificed by the National Electric Code. The sum of 420A is irrelevant. What is important is what devices are on simutaeneously and how much current does each draw. I'd say go ahead. If there is a problem, your main breaker will trip.

Answered 6 months ago by kestrelelectric

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