I am moving to a new residence. I want to install my 220v hot tub. I was thinking of using 6/3 Romex NM-B from my service panel, through my garage wall and through my crawl space directly to the hot tub disconnect breaker box. This is about 75ft. Then from the breaker box I am gonna run 6/3 Romex UFB in flex conduit to my hot tub. This run will be about 15ft. I will be securing the wiring in the crawl space to the floor joices using electrical staples. I will also be securing the conduit using strapping. Does anyone have any better ideas.
In California the 15ft would not be allowed. For hot tubs here, you are only allowed 6ft of liquidtite between the wall of the tub and the connection point, in this case, your disconnect/breaker box. Additional footage under the tub is permissible. So I would be running PVC conduit to a point at least near the tub, if not under it, before transitioning to liquidtite.
Your location can impact the response you get, because of local amendments to the codes.