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I want to put electricals and switches on the wall where there is the pocket for the pocket door. Would I have enough room? What kind of clearance do I need?
Probably not. A regular box is about 3" deep and a regular wall cavity is 3-1/2" wide, not enough space for an electrical box.
dj is right, but if you have a true double wall with the door in between, you can use use a shallow work box.
There must be a minimum of 1 1/4 inches from any wall face to the wiring inside the wall so even though a shallow box might work, you can't meet that spec with a pocket door in a nominal 2X4 wall.
The usual problem isn't the shallow box or switch, its running the wire that will prove tricky.
If you use conduit or MC (metal-clad) cable, you don't have to worry about code-required clearance.
If there really isn't enough space for the electrical boxes, you could use Wiremold-type surface boxes, but that wouldn't look as good. You could also use surface-mount devices. Most that I've seen 0nline are sold for European countries (where they have a lot of old houses where it's impossible to install wires in the walls) and may not be UL listed for use in the United States.
Wiremold (surface wiring) would work- conduit won't. The reason is still space- by the time you have the end-connecter into a box hole, you're going to be tight against the door inside the pocket.
Wiremold isn't bad, but it looks uuu-gly in a home. A recent job I did ended up having the planned pocket doors deleted because of impossible switch placement. Had the original design been followed it would have worked, but because the 'hand' of a tub was reversed putting plumbing in the way, the handing of the door had to be reversed too which left no space for a light switch in the bathroom. The homeowner's choice of electrician failed to catch the potential problem and since he wasn't my guy I wasn't thinking about the wiring after reviewing the original plan, same thing for the plumber.
The lesson there is to plan well and stick with the plan or you might open a can of worms later on! With today's usual materials I think pocket doors should be avoided unless absolutely necessary. I've had to go back on at least half of them in time as rollers wore, tracks bent, half-studs got bent, or doors warped no matter how meticulous I was on the install (which I am with these). Very gently used they will do OK- add kids or tenants and you've got problems coming sooner or later. That's why I install the header trim between the side-stiles- done that way you don't have to take all the molding off to get to the door when you need to fix it!