Thread: Fused main
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Old 05-14-2008, 02:25 PM
Jerry Peck Jerry Peck is offline
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Re: Fused main
"The main is over fused correct?"

Correct.

The service equipment main overcurrent devices should be the same size as, or smaller than, the rating of the conductors they are protecting or the panels they are protecting. Unless, of course, there is another layer of protection downstream which is properly protecting the lesser rated components.

I.e., you could have a 300 amp main, with 300 amp rated conductors, going into a 300 amp rated panel with two 200 amp breakers which then protect the smaller panels fed from them.

But that was not quite what you described that setup as being.
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