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RV Park 240v vs 208

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    RV Park 240v vs 208

    Do RVs actually use any L-L voltages internally?

    Im working on an RV park and there are several that are under construction in my area. I was given some drawings to use as reference and I noticed that the reference designs go out of their way to provide 240v to the RV sites for the 50A receptacles. The reference designs either show a 120/240-1 service that results in a massive service, (or) show a 480v service with single phase transformers.

    I know that Shore Power for boats do require 240v because they utilize control transformers internally and if 208v is brought to a boat it could become an issue.

    However, from what I can tell, all the loads within an RV are actually 120v. Therefore, a 120/208-3 source would really have no impact. Im sure there is some exception where an RV may have a L-L load however chances are that could likely run off of 208v like most other loads.


    #2
    I've never seen an RV with 2-pole loads, and I've worked on several, old and new.

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      #3
      If you read article 551 you will see that there are rec vehicles that use 120/240v 50 amp or 120/208 50 amp. Maybe they use electric heat and a/c....
      They say I shot a man named Gray and took his wife to Italy
      She inherited a million bucks and when she died it came to me
      I can't help it if I'm lucky

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        #4
        551.72(C)

        I believe that is saying you must feed a 50-amp 125/250V receptacle with 120/240 not 120/208. Same as 555.19(A)(3), the informational note is note worthy.

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          #5
          From what I know, Rvs that need a 30A only have one A/C unit and the 50A ones have two A/C units. But I don't think the two unit ones are L-L just two 120V circuits. You run a 2-pole (L-L) 240V to split the 120V loads.
          [COLOR=navy]If you aim at nothing, you will hit it every time![/COLOR]

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            #6
            Originally posted by Little Bill View Post
            From what I know, Rvs that need a 30A only have one A/C unit and the 50A ones have two A/C units. But I don't think the two unit ones are L-L just two 120V circuits. You run a 2-pole (L-L) 240V to split the 120V loads.
            I believe Bill is correct but not sure when it comes to clothes dryers that may be installed.

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              #7
              Be aware of EV charging, which tolerates both but usually is faster at 240V.

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                #8
                I work on an annual event where we power 50 or so large RVs for a week from a couple towable diesel generators. All 3 phase 120/208 generators and distribution and 50 amp 4 wire connections for the RVs. I have never seen one of these rigs with any L-L loads.

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                  #9
                  And a dryer works perfectly on 208v, with the element at 75% of 240v power.
                  Master Electrician
                  Electrical Contractor
                  Richmond, VA

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                    #10
                    We're also working on a design for an RV park. After talking it over with a tech from a large RV service center it was determined that even the biggest RV's with dual 50 amp cords still use only L-N loads.

                    At this point, we are figuring on two services at 208/120v 3 phase.

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                      #11
                      Originally posted by Todd0x1 View Post
                      I work on an annual event where we power 50 or so large RVs for a week from a couple towable diesel generators. All 3 phase 120/208 generators and distribution and 50 amp 4 wire connections for the RVs. I have never seen one of these rigs with any L-L loads.
                      If Billy Idol is on your playlist go reevaluate your life.

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                        #12
                        Originally posted by Cow View Post
                        We're also working on a design for an RV park. After talking it over with a tech from a large RV service center it was determined that even the biggest RV's with dual 50 amp cords still use only L-N loads.

                        At this point, we are figuring on two services at 208/120v 3 phase.
                        If Billy Idol is on your playlist go reevaluate your life.

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                          #13
                          Multiquote is not working after the update.
                          If Billy Idol is on your playlist go reevaluate your life.

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                            #14
                            See 551.40(A). Any Line to Line loads or equipment installed in an RV must have a voltage rating of 208-230 volts.

                            So 208V will work with any L-L RV load.

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