I'm putting a spa on a second floor covered deck. The main panel is in the basement 45 feet from first floor exterior. Wiring would need to go through basement and then crawlspace.
I know I need conduit outside up to second floor disconnect. It is too complicated to run conduit all the way from main panel but can't run cable inside conduit outside. I thought about transitioning from cable to THWN, but it would be almost impossible to put a box inside the crawlspace.
I saw 6/3 w/grnd submersible pump cable online. It has sheathed ground (required by code). Can I run this stuff unprotected (but fastened, of course) indoors and then in conduit outside up to the GFCI disconnect? It would solve a lot of issues. Thanks for reading.