overcurrent protection
- Thread starter Head82180
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- Lockport, IL
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- Semi-Retired Electrical Engineer
I am not completely certain I understand the situation. Are you saying that you have a panel with a rating of 200 amps, that it has a main breaker that is also rated at 200 amps, that you wish to feed this panel from an upstream source, and that you wish to use a 100 amp breaker on the upstream panel? If that is correct, the answer is that this is acceptable. Look at 408.36(A). All that is required is that the upstream breaker cannot be rated higher than the rating of the panel.
Welcome to the forum.
Welcome to the forum.
As charlie stated, yes it's legal, but not a good design.
Some poor sap in the future may think it's a bona-fide 200a, and start loading it up. Many 200a panels are rated for 30 to 40 circuits, and they may overload the 100a upstream.
Yea, I know, we can't enforce the future, but if nothing else, I would either remove the 200a and replace it with a 100a, or if there's a 100a breaker feeding the panel elsewhere, just put lugs in.
Some poor sap in the future may think it's a bona-fide 200a, and start loading it up. Many 200a panels are rated for 30 to 40 circuits, and they may overload the 100a upstream.
Yea, I know, we can't enforce the future, but if nothing else, I would either remove the 200a and replace it with a 100a, or if there's a 100a breaker feeding the panel elsewhere, just put lugs in.
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