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the NM will end up outside in a junction box where it will tie into THHN and then run through conduit. it seems that NM to the junction box outside is OK, but not any further, correct? just needs a waterproof junction box outside?

that's what I needed to know. in my case, I have the wiring coming through a basement cold storage room, will drill through the foundation into a bedroom, run through the wall, then outside through the foundation. that means I need two covered junctions inside the bedroom (one in, one out), but...

running NM through a wall. need power through a hole in the foundation then outside using THHN/THWN. do I put the junction box inside to join NM & THHN then through the foundation, or can I put the box outside and run NM through the hold in the foundation?