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Thread: 2017 NEC and no. of 30 amp sites in an RV park?

  1. #1
    Join Date
    Jan 2015
    Location
    Langley, BC
    Posts
    29

    2017 NEC and no. of 30 amp sites in an RV park?

    Wondering if someone can tell me if the latest edition of the code allows more 30 amp sites on a 200 amp feeder? My understanding is that pre-2017 edition, max 13 sites are permitted? Ran across someone saying that the 2017 edition now allows up to 20 x 30 amp sites on a 200 amp feeder.

    Thanks!
    Gil
    Retired EE (Canadian)
    Langley, BC

  2. #2
    Join Date
    Dec 2006
    Location
    Chapel Hill, NC
    Posts
    33,306
    I believe you need more info than you are providing, There are also demand factors for the number of units .

    551.73 Calculated Load.
    (A) Basis of Calculations. Electrical services and feeders shall
    be calculated on the basis of not less than 12,000 volt-amperes
    per site equipped with 50-ampere, 208Y/120 or 120/240-volt
    supply facilities; 3600 volt-amperes per site equipped with both
    20-ampere and 30-ampere supply facilities; 2400 volt-amperes
    per site equipped with only 20-ampere supply facilities; and
    600 volt-amperes per site equipped with only 20-ampere supply
    facilities that are dedicated to tent sites. The demand factors
    set forth in Table 551.73(A) shall be the minimum allowable
    demand factors that shall be permitted in calculating load for
    service and feeders. Where the electrical supply for a recreational
    vehicle site has more than one receptacle, the calculated
    load shall be calculated only for the highest rated receptacle.
    Where the electrical supply is in a location that serves two
    recreational vehicles, the equipment for both sites shall comply
    with 551.77, and the calculated load shall only be calculated for
    the two receptacles with the highest rating.
    (B) Demand Factors. The demand factor for a given number
    of sites shall apply to all sites indicated. For example, 20 sites
    calculated at 45 percent of 3600 volt-amperes results in a
    permissible demand of 1620 volt-amperes per site or a total of
    32,400 volt-amperes for 20 sites.
    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



  3. #3
    Join Date
    Dec 2006
    Location
    Chapel Hill, NC
    Posts
    33,306
    Actually, you have enough info. The 2017 rule changed for 50 amp sites not for 30 amp sites
    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



  4. #4
    Join Date
    Jan 2015
    Location
    Langley, BC
    Posts
    29
    Quote Originally Posted by Dennis Alwon View Post
    I believe you need more info than you are providing, There are also demand factors for the number of units .
    Thx, that's all I need to know! Unless someone has other info... Am aware of the demand factors for number of sites, but was just wondering if they'd changed or something else in art. 551 or elsewhere.
    Gil
    Retired EE (Canadian)
    Langley, BC

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