ARTICLE 551
Recreational Vehicles and Recreational
Vehicle Parks
I. General
551.1 Scope. The provisions of this article cover the electrical conductors and equipment other than low- voltage and automotive vehicle circuits or extensions thereof, installed within or on recreational vehicles, the conductors that connect recreational vehicles to a supply of electricity, and the installation of equipment and devices related to electrical installations within a recreational vehicle park.
FPN: For information on low-voltage systems, refer to NFPA 1192-2005, Standard on Recreational Vehicles, and ANSI/RVIA 12V-2005, Standard for Low Voltage Systems in Conversion and Recreational Vehicles.
551.2 Definitions. (See Article 100 for additional definitions.)
Air-Conditioning or Comfort-Cooling Equipment. All of that equipment intended or installed for the purpose of processing the treatment of air so as to control simultaneously its temperature, humidity, cleanliness, and distribution to meet the requirements of the conditioned space.
Appliance, Fixed. An appliance that is fastened or otherwise secured at a specific location.
Appliance, Portable. An appliance that is actually moved or can easily be moved from one place to another in normal use.
FPN: For the purpose of this article, the following major appliances, other than built-in, are considered portable if cord connected: refrigerators, 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.
Camping Trailer. A vehicular portable unit mounted on wheels and constructed with collapsible partial side walls that fold for towing by another vehicle and unfold at the campsite to provide temporary living quarters for recreational, camping, or travel use. (See Recreational Vehicle.)
Converter. A device that changes electrical energy from one form to another, as from alternating current to direct current.
Dead Front (as applied to switches, circuit breakers, switchboards, and distribution panelboards). Designed, constructed, and installed so that no current-carrying parts are normally exposed on the front.
Disconnecting Means. The necessary equipment usually consisting of a circuit breaker or switch and fuses, and their accessories, located near the point of entrance of supply conductors in a recreational vehicle and intended to constitute the means of cutoff for the supply to that recreational vehicle.
Distribution Panelboard. A single panel or group of panel units designed for assembly in the form of a single panel, including buses, and with or without switches and/or automatic overcurrent protective devices for the control of light, heat, or power circuits of small individual as well as aggregate capacity; designed to be placed in a cabinet or cutout box placed in or against a wall or partition and accessible only from the front.
Frame. Chassis rail and any welded addition thereto of metal thickness of 1.35 mm (0.053 in.) or greater.
Low Voltage. An electromotive force rated 24 volts, nominal, or less, supplied from a transformer, converter, or battery.
Motor Home. A vehicular unit designed to provide temporary living quarters for recreational, camping, or travel use built on or permanently attached to a self-propelled motor vehicle chassis or on a chassis cab or van that is an integral part of the completed