Block construction home. Only about 1.5 inches clearance between back of drywall and block. Existing three gang box cannot accommodate deeper switches and wiring. I can take one switch out of the box -- it switches a half-hot receptacle, but there is another switched outlet in the same room. So I only need two devices in this area, but I need some extra room for existing wiring and to accommodate deeper switches.
I'm thinking about opening up the dry wall, removing the old box, and installing two 4" square boxes side by side, but then with a step down mud-ring on each for just one device. That should leave me plenty of room in the boxes and I'll have a clean look with two switches once the drywall is patched up.
I'm thinking about using a 4 inch square 1.5" deep box with a bracket and attaching it to the stud. And then I would use a knockout on the other side of that box to connect another 4 inch square box using some kind of nipple or connector. The questions:
- Is this permitted? So, box 1 is connected to stud and then box 2 is connected only to box 1. Is the stud connection ok to support two boxes connected this way?
- What kind of connector do I use between the two boxes? I think I need to have a little bit of distance between the two boxes -- like maybe a half inch or so -- to make sure the mud rings fit nicely. I think I will need to run two pieces of 14-2 wire between the boxes. Do the insides of the connector between the boxes need any kind of insert or something to prevent rubbing, etc.
- Does the connector between the two boxes bind the entire set up? In other words, assuming all my grounds are connected in the box can I pig tail a single ground to a ground clip on one box or do I need to ground both boxes?