Choosing Electrical Boxes
A single-gang box 3 1⁄2 in. deep has a capacity of roughly 22 1⁄2 cu. in., enough space for a single device (receptacle or switch), three 12–2 w/grd cables, and two wire connectors.
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How Much Can You Fit in a Single Electrical Box?
Single-gang electrical enclosures are those with a single rectangular space. Everything inside of the box is in that single space, meaning there is less overall room for wires and equipment.
Proper size of an Electrical Box
The size of the box is determined by its volume, the volume of the box is found by using this formula. Height x Width x Length = The total cubic inches or the volume of the box.