I am trying to decide what to run from my main panel to my spa panel. I am planning on the wire to carry 50 amps. I originally thought I would run individual 6 gauge wires in conduit because I thought it would be cheaper. After looking at it a little more it looks like it would be a lot of work running the conduit compared to what I would save. I will be running the wire in my basement along the floor joists. I need to go about forty feet. Can I run 6/3 Romex without using conduit? I have 12/2 Romex running through my basement without conduit and was wondering if there is any difference? I understand that I wold need conduit coming down the wall to the spa panel just like I have for the other outlets in my basement. If the research I have read about wiring up a hot tub is the same as what I am trying accomplish it seems like unless the wires are individual conduit is not recommended. Thanks for any help.