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Code Q&A

Sep 23, 2010 1:37 PM, By Mike Holt

Q. Is overcurrent protection required for a panelboard?

A. Each panelboard must be provided with overcurrent protection located within or at any point on the supply side of the panelboard [408.36]. The overcurrent device must have a rating not greater than that of the panelboard. As noted in Exception No. 1 of this rule, individual overcurrent protection is not required for panelboards used as service equipment in accordance with 230.71. When a panelboard is supplied from a transformer, as permitted in 240.21(C), the overcurrent protection for the panelboard must be on the secondary side of the transformer. The required overcurrent protection can be in a separate enclosure ahead of the panelboard, or it can be in the panelboard [408.36(B)].

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