2020 Designing Wiring Methods

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Boxes and conduits shall be sized and selected to accommodate the number of conductors required to supply power to various pieces of electrical equipment in residential, commercial, and industrial locations. Boxes, in addition to housing conductors, shall have enough fill area to provide sufficient space for receptacles, switches, dimmers, and combination devices without damaging the conductors insulation.

When boxes and conduits are not sized properly, conductors are sometimes packed in undersized boxes and are pinched by large-size devices that intrude into the box’s fill area. Therefore, conductors, devices, fittings, and clamps shall be counted and the appropriate box selected. Boxes and conduits shall be sized based on the number of conductors of either the same size and having the same characteristics or different sizes and different characteristics.

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