I am wiring a small workshop, using conduit. I was shocked to see how expensive THHN/THHW cable is, with respect to NM-B: at local big-box store, 100ft of 14/2 NM was $33, whereas 100ft of THHN was about $20 (so $60, almost double the price of NM, for 2 conductors plus EGC).
I am wondering about the pros and cons of using NM instead of THHN. Issues I see, for various options, are as follows:
Just run exposed NM ? Probably against code, but it's just a detached shop and won't be inspected. I'm using conduit for outlets, but this is for lighting wiring in the ceiling, so out of reach; OTOH, it might be tempting to hang things on it. Probably a terrible idea.
Run NM inside conduit ? Might be tough, due to its stiffness. OTOH, I'm using pretty big conduit (3/4" for just 2 14ga conductors plus EGC) and only two bends max.
Pull the conductors out of the NM jacket and use these in the conduit ? How difficult would this be ? Don't want to have to rip the jacket the whole way, but once one conductor is pulled out (probably the EGC) the others should be easy. I've heard varying opinions on whether the wire inside the jacket of NM is actually THHN. I've read it doesn't have as "slippery" insulation, so doesn't pull as easily as real THHN. I've also read it's un-marked, so technically against code, but I probably don't care.
Bite the bullet and pay much more for real THHN.
Use armored cable such as MC or BX.