MOBILE HOMES AND MOBILE HOME PARKS

70-589 (FPN): For the purpose of this article, the following major appliances, other than built-in, are considered portable if cord-connected: refrigerators, gas range equipment, clothes washers, dishwashers without booster heaters, or other similar appliances. Appliance, Stationary: An appliance that is not easily moved from one place to another in normal use. Distribution Panelboard: See definition of panelboard in Article 100. Feeder Assembly: The overhead or under-chassis feeder conductors, including the grounding conductor, together with the necessary fittings and equipment or a power-supply cord listed for mobile home use, designed for the purpose of delivering energy from the source of electrical supply to the distribution panelboard within the mobile home. Laundry Area: An area containing or designed to contain a laundry tray, clothes washer, or a clothes dryer. Mobile Home: A factory-assembled structure or structures transportable in one or more sections, that is built on a permanent chassis and designed to be used as a dwelling without a permanent foundation where connected to the required utilities, and includes the plumbing, heating, airconditioning, and electric systems contained therein. Unless otherwise indicated, the term "mobile home" includes manufactured homes that are similar structure(s) designed to be used with a permanent foundation. (FPN): The phrase "with a permanent foundation" indicates that the home is permanently attached to a permanent foundation acceptable to the authority having jurisdiction, such that moving the structure is not likely to occur. Mobile Home Accessory Building or Structure: Any awning, cabana, ramada, storage cabinet, carport, fence, windbreak, or porch established for the use of the occupant of the mobile home upon a mobile home lot. Mobile Home Lot: A designated portion of a mobile home park designed for the accommodation of one mobile home and its accessory buildings or structures for the exclusive use of its occupants. Mobile Home Park: A contiguous parcel of land that is used for the accommodation of occupied mobile homes. Mobile Home Service Equipment: The equipment containing the disconnecting means, overcurrent protective devices, and receptacles or other means for connecting a mobile home feeder assembly. Park Electrical Wiring Systems: All of the electrical wiring, fixtures, equipment, and appurtenances related to electrical installations within a mobile home park, including the mobile home service equipment. 550-3. Other Articles. Wherever the requirements of other articles of this Code and Article 550 differ, the requirements of Article 550 shall apply. 70-590 NATIONAL ELECTRICAL CODE 550-4. General Requirements. (a) Mobile Home Not Intended as a Dwelling Unit. A mobile home not intended as a dwelling unit, as for example equipped for sleeping purposes only, contractor's on-site offices, construction job dormitories, mobile studio dressing rooms, banks, clinics, mobile stores, or intended for the display or demonstration of merchandise or machinery, shall not be required to meet the provisions of this article pertaining to the number or capacity of circuits required. It shall, however, meet all other applicable requirements of this article if provided with an electrical installation intended to be energized from a 120-volt or 120/240-volt ac power supply system. Where different voltage is required by either design or available power supply system, adjustment shall be made in accordance with other articles and sections for the voltage used. (b) In Other than Mobile Home Parks. Mobile homes installed in other than mobile home parks shall comply with the provisions of this article. (c) Connection to Wiring System. The provisions of this article apply to mobile homes intended for connection to a wiring system rated 120/240 volts, nominal, 3-wire ac, with grounded neutral. (d) Listed or Labeled. All electrical materials, devices, appliances, fittings, and other equipment shall be listed or labeled by a qualified testing agency and shall be connected in an approved manner when installed. B. Mobile Homes 550-5. Power Supply. (a) Feeder. The power supply to the mobile home shall be a feeder assembly consisting of not more than one listed 50-ampere mobile home power-supply cord with integral molded cap, or a permanently installed feeder. Exception No. 1: A mobile home that is factory-equipped with gas or oil-fired central heating equipment and cooking appliances shall be permitted to be provided with a listed mobile home power-supply cord rated 40 amperes. Exception No. 2: Manufactured homes constructed in accordance with Section 550-23(a), Exception No. 2. (b) Power-Supply Cord. If the mobile home has a power-supply cord, it shall be permanently attached to the distribution panelboard or to a junction box permanently connected to the distribution panelboard, with the free end terminating in an attachment plug cap. Cords with adapters and pigtail ends, extension cords, and similar items shall not be attached to, or shipped with, a mobile home. A suitable clamp or the equivalent shall be provided at the distribution panelboard knockout to afford strain relief for the cord to prevent strain from being transmitted to the terminals when the power-supply cord is handled in its intended manner. The cord shall be a listed type with four conductors, one of which shall be identified by a continuous green color or a continuous green color with one or more yellow stripes for use as the grounding conductor. ARTICLE 550 - MOBILE HOMES AND MOBILE HOME PARKS 70-591 (c) Attachment Plug Cap. The attachment plug cap shall be a 3-pole, 4-wire, grounding type, rated 50 amperes, 125/250 volts with a configuration as shown in Figure 550-5(c) and intended for use with the 50-ampere, 125/250 receptacle configuration shown in Figure 550-5(c). It shall be molded of butyl rubber, neoprene, or other materials that have been found suitable for the purpose and shall be molded to the flexible cord so that it adheres tightly to the cord at the point where the cord enters the attachment plug cap. If a right-angle cap is used, the configuration shall be so oriented that the grounding member is farthest from the cord. (FPN): Complete details of the 50-ampere plug and receptacle shown in Figure 550-5(c) can be found in ANSI Standard Dimensions of Caps, Plugs and Receptacles, C73.17-1972. Receptacle Cap G G Y Y W W 125/250-volt, 50-amp, 3-pole, 4-wire, grounding type Figure 550-5(c). 50-ampere, 125/250-Volt Receptacle and Attachment-plug-cap Configurations, 3-pole, 4-wire, Grounding-types, Used for Mobile Homes Supply Cords and Mobile Home Parks. (d) Overall Length of a Power-Supply Cord. The overall length of a power-supply cord, measured from the end of the cord, including bared leads, to the face of the attachment plug cap shall not be less than 21 feet (6.4 m) and shall not exceed 36½ feet (11.13 m). The length of the cord from the face of the attachment plug cap to the point where the cord enters the mobile home shall not be less than 20 feet (6.1 m). (e) Marking. The power-supply cord shall bear the following marking: "For use with mobile homes - 40 amperes" or "For use with mobile homes - 50 amperes." (f) Point of Entrance. The point of entrance of the feeder assembly to the mobile home shall be in the exterior wall, floor, or roof. (FPN No. 1): For location of distribution panelboard, see Section 550-6(a). (FPN No. 2): For location of attachment of feeder assembly, see Section 550-23(e). (g) Protected. Where the cord passes through walls or floors, it shall be protected by means of conduits and bushings or equivalent. The cord shall be permitted to be installed within the mobile home walls, provided a continuous raceway having a maximum size of 1½ inches (31.8 mm) is installed from the branch-circuit panelboard to the underside of the mobile home floor. 70-592 NATIONAL ELECTRICAL CODE (h) Protection Against Corrosion and Mechanical Damage. Permanent provisions shall be made for the protection of the attachment plug cap of the power-supply cord and any connector cord assembly or receptacle against corrosion and mechanical damage if such devices are in an exterior location while the mobile home is in transit. (i) Mast Weatherhead or Raceway. Where the calculated load exceeds 50 amperes or where a permanent feeder is used, the supply shall be by means of: (1) One mast weatherhead installation, installed in accordance with