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Mar 27, 2017 at 21:16 comment added Harper - Reinstate Monica @Kris Box fill is a serious issue, both in a physical and statutory sense. For the statutory, most boxes state their cubic inch capacity or they are standard. Pigtails are free, all grounds count as 1 wire, and any yoke (switch or receptacle) counts as 2 wires. So you're at 9 heading to 11. Each wire takes 2 cubic inches (14 gauge) or 2.25 cubic inches (12 gauge). I hope the existing box is a 4x4 box!
Mar 27, 2017 at 21:15 comment added isherwood Romex is a brand. Feel free to just call them "cables". I have no idea if your box is a mess or is undersized for the job. A photo in your original post would help. Also, there are code limits to what a box of a particular size can contain. Check for a volume rating in cubic inches stamped into the box.
Mar 27, 2017 at 20:57 comment added user67817 Great thanks I can use this for reference purposes! But the only issue I would have now is, there is already a tight fit with the existing Romex wires. Do you think i should install a junction box to stuff all the wires in?
Mar 27, 2017 at 20:49 history answered isherwood CC BY-SA 3.0