Wires aren't the only components you need to worry about when calculating box fill. You also need to consider the volume of any conductors, clamps, support fittings, devices, equipment, and grounding ...
What size octagonal box must you use to support a lighting fixture supplied with two No. 14-2 (with ground) nonmetallic-sheathed cables (NMCs) with a fixture stud, hickey, and two No. 14 fixture wires ...
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