I'm adding a receptacle on the exterior wall and I'd like to power it from a very conveniently located gang box which on the interior side of the wall. The existing box is covered with a blank plate, and since it is 5 1/2 feet off the floor, it must have been for a wall sconce. Inside the box are three pieces of Romex: two are three wire, but the third has a red traveler. Everything is connected with wire nuts: NUT 1 – all white. NUT 2 – black from one romex, and red from the 4 wire. NUT 3 – black from the last piece of romex, black from the 4 wire, and then a black wire that connects NUTS 2 and 3.
It seems to me that I can add my new romex to NUT 1 and NUT 3, and I should be ok. I highly doubt this is to code, so I anticipate that any advice will come with the caveat that this isn't to code. I'm in New Jersey, and thanks.
Best Answer
So if this is on a traveler circuit
I think your logic about what you intend to do is fine. You will have a hot a neutral and a ground.
One of the things that looks off to me is that normally your switches have the traveler between them and not your luminary box. You would see here Two 4 wire romex's [red to red ]and then your 3 way power romex - perhaps you had two sconce lamp receptacles..