I can't seem to find a definite answer to this, so here goes.
I'm prepping to get a permit to do some electrical work, which will entail branching from an existing circuit at a ceiling box to add a few outlets. The existing box is too small to add anything new to, so I need to swap out the box. My question comes in regards to the fill calculations.
This box will have 4 14-2 w/ gnd NM cables and nothing else. Based on my calculations, this requires 18 cu in for the wiring.
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