Finishing a basement and I need to add a subpanel. Main panel is outside. Subpanel will be in the basement. 70 Amp breaker in the main to feed the subpanel. I was thinking THHN but would this mean I need to run the conduit all the way to the subpanel?
Would NM-B be ok?
Edit: I live in Colorado if that makes any difference and I think the wire size is #6 for THHN and #4 for NM-B.