The consequences of undersizing outlet boxes can include damaged wiring, overheating, and even electrical fires. But you can’t just oversize boxes “to be on the safe side” because that wastes space ...

Note: This article is based on the 2005 NEC. Box fill isn’t just the number of wires in the box — it's the total volume of the conductors, devices, and fittings in a box. Every outlet box has a ...