I’m trying to add a 3 way switch to my basement stairs on a basement remodel and trying to confirm what size box I would need for the connections.
In a junction box currently I have which I believe is 14/2 power in and 14/2 to the existing top of the stairs switch. And then I have 12/2 going to the first recessed light in succession. I want to change the first switch and add an existing for 3 way.
I was planning on pulling the old switch and wire out and running 12/3 to it and then 12/3 to the new switch.
So if I’m understanding correctly…
14/2 – 4 in
12/2 – 4.5 in
2- 12/3 – 14 in
Ground – 2.25
24.75 in box minimum.
I used 12/2 to the light because that’s what I had lying around. The breaker that is attached to this circuit is 15 amps also has other lights and outlets throughout the house, but could I potentially use 14/3 for the new switches instead of 12/3?
Unless the original feed is 12/2 then I guess it would be 25.25 cubic in.
was planning on just getting a bigger metal box than I currently have attached to the joist.