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What is the maximum size branch breaker that can be installed in an NF panel with a 400A main breaker?
Issue:
Maximum breaker for 400amp NF panel.

Product Line:
NF Panelboards

Environment:
Products sold in North America

Resolution:
The maximum branch circuit breaker is 125 amp.

One or two Powerpact J frame, 250 amp maximum, sub-feed breakers can be installed use sub-feed breaker kit NF600SFBJ and the proper back box and trim.  The NF600SFBJ requires more mounting space versus the standard enclosure.  See the Digest for sizes.

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