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The tip I got from an electrician was to just buy the big boxes; the cost difference is minor, it's easier to work in bigger boxes, and then you don't have to work about it.


Every 14 ga. wire entering (or exiting) the box needs 2 cubic inches. Every 12 ga. needs 2.25 cubic inches. All grounds together count as 1 wire, as do internal clamps. Every device (such as a switch or a receptacle on a single strap) counts as double the wire size it connects to. Rough add-up (" standing for cubic inches): One 14/2 cable in (2x2"), two ...

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