![]() So a “20/30” panel, for example, has 20 slots, but will accept up to 30 circuits, allowing up to half of the slots to be tandems. Some panels only allow one breaker per slot, while others allow some or all of the slots to accept a tandem breaker, which fits two breakers in one slot. That number can be found in the fine print of the data plate on the inside of the panel door and is often near the schematic diagram. That was the absolute maximum, unless the manufacturer specified a lower number, which was often the case for smaller panel boxes.īut the 2008 edition of the NEC deleted the maximum number and the new standard became whatever the manufacturer specifies. ![]() The National Electrical Code (NEC) specified that a lighting and appliance branch circuit panelboard could not contain more than 42 overcurrent devices (circuit breakers). ![]() The answer to this question was once very simple. ![]()
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