Required 240V / 50A. I’m adding a 50A breaker to my panel and the hot tub manufacture provides a disconnect GFCI with the tub that will be located about 8’ from the tub. The tub will sit on an elevated deck (wood) that abuts the house. No part of the wiring will be below grade. Coming from the panel I plan on running 6/3 NM-B with ground across the unfinished basement to the easiest point of exit close to where the GFCI will be over about 6’ and up about 4’. Coming out of the GFCI I will go down 4’ and across the bottom of the deck framing 10’ and up into electrical area inside the tub. I plan on doing all that with PVC conduit, sealed. I will have LBs at the 4 turns. The question I have is can I continue the 6/3 NM-B from inside into the conduit for the full run? Reading on line I get different opinions as to what is considered a wet zone and also how much oversize a conduit has to be to handle a cable that has an outer covering to handle heat dissipation. I have also read where it’s recommended to strip the sheath off when running thru conduit. I don’t see any possible way that water could get in doing it this way but my assumption of a wet zone and what is code could be miles apart. If I can’t do this and have to run single conductors thru conduit would I be better with a junction box just inside the basement or would you run the conduit all the way to the panel?