I can't vouch for other states, but out here in Washington, Rv's fall under the NFPA 1192 Standard for recreational vehicles. Section 4.4 Electrical requirements sends you to the NFPA 70 (National electrical code) chapter 551 Recreational vehicles for all electrical requirements. There is not a direct mention in that chapter for having to comply with the panel location requirements of 230 and 240, but the inspectors I deal with out here consider it a gray area and will not permit the panel to be in a bathroom. Even if you are not getting inspections and such, it is never a bad idea to comply with codes (especially electrical and life safety). Being as compliment as possible can help down the road if there is an accident or an insurance claim.
Once I finally get mine off of the drawing board and actually build, I will have it inspected by the local agency and get a placard to show that it was built to code and inspected should I ever decide to sell it. That is probably more hassle and work than most wish to take but my type A personality drives me to it...
Dave
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