This might be an X/Y problem, so if there is a better solution, I'm all ears. I have a 3-gang electrical box in my basement that is already overcrowded. It has
- The wire for the three-way light in the stairwell
- The wire for the doorbell transformer
- The wire going to the "j-box for smoke detectors" (handle labeled junction in the ceiling, I have no idea of what this is, but I presume it's important)
- The wire for the lights in the basement.
- The two double-dimmer switches I'm planning on adding are extra deep
I intend to introduce three more wires, and cut out 1 as I'm replacing the basement lights with 4 dimmable zones. I have open access to the wall (the other side is the utility room). I know that the simplest solution would be to move the doorbell and smoke detector wires to an intermediary junction box, but that only gets rid of two wires and I'm still planning on adding three more. I'd like to if possible have a carrier(s) between the two junction boxes for the light zones as well
I'm thinking the below (stupidly complicated) diagram is the easiest way to get it all done with the least space used in the actual switch box if I introduce a secondary junction box above it. Please note, in the below diagram, common is indicated by blue wires (it's hard to show white wires on a white background).
I'll have three sets of wires running between the two junction boxes, 1 to carry 120VAC, the other two to individual dimmer circuits plus ground. My main concern is that I'll be using white wire to carry a hot voltage between the two boxes. Is there any way I can label this to keep it to code, or do I have to run all four light-zone wires to the lower box? For code reference, I'm in the US, kansas to be exact.
Edit: As per the diagram, tan boxes are shielded NM wire, grey boxes are wire nuts/splices, the two large black boxes are the electrical junction boxes (blue plastic), and the lower large box also shows how the switches would be wired.