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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.


3

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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