I just want to confirm I have my wiring down correctly. I live in the US (upstate NY) which is under NEC regulation; no local code regulations added on top of NEC.
I am installing a new outlet (120V/20A duplex) in my basement (exposed, block foundation walls). I am running 12/2 Romex out of my service panel, stapling the Romex to the floor joists (the ceiling of my basement) until I get to the area on the wall directly above where the outlet will be. From there I will run the Romex into a junction box. Inside the junction box I will strip off the outer Romex, exposing the 3 THHN wires inside of it (hot, neutral and ground).
The hot and neutral wires will not be perturbed at all and will be sent down a PVC conduit all the way to the junction box housing the outlet, where they will be attached to the outlet.
Inside the junction box above the outlet (where the Romex is stripped), there will be a green grounding screw. My plan is to run ground wire around that screw, and then cut the green ground wire coming out of the Romex and tie both sides of that cutpoint into the ground wire coming out of the screw via wing nut like so:
I believe this is the correct way to go so that:
- I'm not running Romex through 1/2" conduit
- my junction box (where the Romex gets stripped) is properly grounded
Can someone spot if I'm doing anything wrong here? I understand there may be other ways to do this, but this is the solution I've chosen and I just want to make sure what I'm doing is safe, to code and is correct (in terms of achieving proper grounding). Thanks in advance.
Best Answer
NM wires are "mystery meat"
The UL specification for NM cable does not require the wires to be THHN, or marked with their insulation type for that matter. As a result, you can't just "shuck" a NM cable and stuff its wires down a conduit as you propose. Instead, you'll need to splice the NM cable hot and neutral to THHN in the interior junction box. Your grounding plan, though, is sound.