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Do subfeed breakers use up pole spaces of the panel interior?

Do subfeed breakers take up panel interior space or are they mounted separately?

Product Line:

NQ, NF, NQOD, NEHB Panelboard

The subfeed breakers are mounted with in the panel but they do not use up interior branch space. However, they do count toward circuits in the panel. So if you have a panel that must meet the 42 circuit rule then 2 - 3 pole sub feed brakers would count as part of the 42 circuits regardless if they take up speace in the interior.

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