If I have NM cable running into a junction box, can I strip the sheath of the NM cable starting inside the junction box and run the conductors without a sheath through conduit that is connected to the junction box?
I understand that the wiring you'd typically use through conduit is THHN or NM (if you want to use the conduit solely as protection). But I'd like to be able to take this incoming NM cable and have it's conductors only continue on through conduit along with some other THHN that's coming from another source.
The individual conductors of the NM cable while not labeled can still be traced back to where the sheathing ends, so technically the conductors are still identifiable as to what they are.
If need be, I could splice the NM conductors to THHN wire in the junction box, but I don't see a reason to add a splice where I don't think it's needed.
My reasoning for why I think this should be OK is that if you terminate NM cable in a panel, you typically have a foot or so of the conductors without the sheath and there's nothing identifying those other than tracing it back to the sheath it came from.