I'm replacing some electrical wiring in a shed attached to my house (it's in an enclosed area under the deck with a cement slab. It has doors and windows. It's not wet, but it isn't a sealed area like it inside the house (lots of gaps around the shed door leading to the outside). I'm guessing it qualifies as a damp area. The existing wiring was just NM sheathed cable stapled around the walls.
I'm planning on using one of these boxes:
It's a single-gang PVC electrical box with 3 threaded 1/2" knockouts (top, bottom, and back). Presently the NM sheathed cable (coming from the house) just sticks out through a in the wall. I'd like to place this box on the wall where the NM sheathed cable comes out, and terminate the NM sheathed cable in it. However, I should probably install some sort of strain relief. I can think of a few options:
- Push in plastic strain relief. I think those are made for metal boxes though. I can't really get them to fit a threaded hole
- Metal threaded NM clamp. The threads don't really fit the PVC threads all that well. I'm also not sure if the clamp would need to be bonded.
- Threaded nylon strain relief: This kind of seems like overkill. It would have to go inside the box.
Am I using the wrong box?