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Chaptewr 5 Special Occupancies | 547.42 | The service disconnecting means and overcurrent protection for each set of feeders or branch circuits shall be located at the distribution point. The service disconnecting means shall be installed in accordance with Part VI of Article 230. The feeders or branch circuits supplied to buildings or structures shall comply with 250.32 and Article 225, Parts I and II. Informational Note: Methods to reduce neutral-to-earth voltages in livestock facilities include supplying buildings or structures with 4-wire single-phase services, sizing 3-wire single-phase service and feeder conductors to limit voltage drop to 2 percent, and connecting loads line-to-line, will provide reasonable efficiency of operation. [547.42](https://2023.antflix.net#547.42) | https://2023.antflix.net#547.42 |
Chaptewr 5 Special Occupancies | 547.43 | Where a site is supplied by more than one distribution point, a permanent plaque or directory shall be installed at each of these distribution points denoting the location of each of the other distribution points and the buildings or structures served by each. [547.43](https://2023.antflix.net#547.43) | https://2023.antflix.net#547.43 |
Chaptewr 5 Special Occupancies | 547.44 | The installation and bonding of equipotential planes shall comply with 547.44(A) and (B). For the purposes of this section, the term livestock shall not include poultry. [547.44](https://2023.antflix.net#547.44) | https://2023.antflix.net#547.44 |
Chaptewr 5 Special Occupancies | 547.44(A) | Equipotential planes shall be required in the following areas: [547.44(A)](https://2023.antflix.net#547.44(A)) | https://2023.antflix.net#547.44(A) |
Chaptewr 5 Special Occupancies | 547.44(A)(1) | Equipotential planes shall be installed in confinement areas with concrete floors where metallic equipment is located that may become energized and is accessible to livestock. [547.44(A)(1)](https://2023.antflix.net#547.44(A)(1)) | https://2023.antflix.net#547.44(A)(1) |
Chaptewr 5 Special Occupancies | 547.44(A)(2) | Equipotential planes shall be installed in concrete slabs where metallic equipment is located that may become energized and is accessible to livestock. The equipotential plane shall encompass the area where the livestock stands while accessing metallic equipment that may become energized. [547.44(A)(2)](https://2023.antflix.net#547.44(A)(2)) | https://2023.antflix.net#547.44(A)(2) |
Chaptewr 5 Special Occupancies | 547.44(B) | Equipotential planes shall be bonded to the grounding electrode system or an equipment grounding terminal in any panelboard of the electrical grounding system associated with the equipotential plane. The bonding conductor shall be solid copper, insulated, covered or bare, and not smaller than 8 AWG. The means of bonding to wire mesh or conductive elements shall be by pressure connectors or clamps of brass, copper, copper alloy, or other approved means. Slatted floors that are supported by structures that are a part of an equipotential plane shall not require bonding. Informational Note No. 1: See ASEA/ASABE EP473.2-2001 (R2015), Equipotential Planes in Animal Containment Areas, for methods to establish equipotential planes. Informational Note No. 2: See ASEA/ASABE EP342.3-2010 (R2015), Safety for Electrically Heated Livestock Waterers, for methods for safe installation of livestock waterers. Informational Note No. 3: Low grounding electrode system resistances may reduce voltage differences in livestock facilities. [547.44(B)](https://2023.antflix.net#547.44(B)) | https://2023.antflix.net#547.44(B) |
Chaptewr 5 Special Occupancies | 550.1 | This article covers the electrical conductors and equipment installed within or on mobile and manufactured homes, the conductors that connect mobile and manufactured homes to a supply of electricity, and the installation of electrical wiring, luminaires, equipment, and appurtenances related to electrical installations within a mobile home park up to the mobile home service-entrance conductors or, if none, the mobile home service equipment. Informational Note: See NFPA 501-2017, Standard on Manufactured Housing, and Part 3280, Manufactured Home Construction and Safely Standards, of the Federal Department of Housing and Urban Development for additional information on manufactured housing. [550.1](https://2023.antflix.net#550.1) | https://2023.antflix.net#550.1 |
Chaptewr 5 Special Occupancies | 550.4(A) | Mobile homes installed in other than mobile home parks shall comply with the provisions of this article. [550.4(A)](https://2023.antflix.net#550.4(A)) | https://2023.antflix.net#550.4(A) |
Chaptewr 5 Special Occupancies | 550.4(B) | This article shall apply to mobile homes intended for connection to a wiring system rated 120/240 volts, nominal, 3-wire ac, with a grounded neutral conductor. [550.4(B)](https://2023.antflix.net#550.4(B)) | https://2023.antflix.net#550.4(B) |
Chaptewr 5 Special Occupancies | 550.4(C) | All electrical materials, devices, appliances, fittings, and other equipment shall be listed and labeled by a qualified testing agency and shall be connected in an approved manner when installed. [550.4(C)](https://2023.antflix.net#550.4(C)) | https://2023.antflix.net#550.4(C) |
Chaptewr 5 Special Occupancies | 550.10(A) | 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 or a permanently installed feeder. Exception No. 1: A mobile home that is factory equipped with gas or oil-fired centered 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: A feeder assembly shall not be required for manufactured homes constructed in accordance with 550.32(B). [550.10(A)](https://2023.antflix.net#550.10(A)) | https://2023.antflix.net#550.10(A) |
Chaptewr 5 Special Occupancies | 550.10(B) | If the mobile home has a power-supply cord, it shall be permanently attached to the panelboard, or to a junction box permanently connected to the 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 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 equipment grounding conductor. [550.10(B)](https://2023.antflix.net#550.10(B)) | https://2023.antflix.net#550.10(B) |
Chaptewr 5 Special Occupancies | 550.10(C) | 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 550.10(C) and intended for use with the 50-ampere, 125/250-volt receptacle configuration shown in Figure 550.10(C). It shall be listed, by itself or as part of a power-supply cord assembly, for the purpose and shall be molded to or installed on the flexible cord so that it is secured 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 oriented so that the grounding member is farthest from the cord. Informational Note: See ANSI/NEMA WD 6-2016, Wiring Devices - Dimensional Specifications, Figure 14-50, for complete details of the 50-ampere plug and receptacle configuration. [550.10(C)](https://2023.antflix.net#550.10(C)) | https://2023.antflix.net#550.10(C) |
Chaptewr 5 Special Occupancies | 550.10(D) | 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 6.4 m (21 ft) and shall not exceed 11 m (361/2 ft). 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 6.0 m (20 ft). [550.10(D)](https://2023.antflix.net#550.10(D)) | https://2023.antflix.net#550.10(D) |
Chaptewr 5 Special Occupancies | 550.10(E) | The power-supply cord shall bear the following marking: FOR USE WITH MOBILE HOMES - 40 AMPERES or FOR USE WITH MOBILE HOMES - 50 AMPERES [550.10(E)](https://2023.antflix.net#550.10(E)) | https://2023.antflix.net#550.10(E) |
Chaptewr 5 Special Occupancies | 550.10(F) | The point of entrance of the feeder assembly to the mobile home shall be in the exterior wall, floor, or roof. [550.10(F)](https://2023.antflix.net#550.10(F)) | https://2023.antflix.net#550.10(F) |
Chaptewr 5 Special Occupancies | 550.10(G) | 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 32 mm (11/4 in.) is installed from the branch-circuit panelboard to the underside of the mobile home floor. [550.10(G)](https://2023.antflix.net#550.10(G)) | https://2023.antflix.net#550.10(G) |
Chaptewr 5 Special Occupancies | 550.10(H) | 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. [550.10(H)](https://2023.antflix.net#550.10(H)) | https://2023.antflix.net#550.10(H) |
Chaptewr 5 Special Occupancies | 550.10(I) | Where the calculated load exceeds 50 amperes or where a permanent feeder is used, the supply shall be by means of either of the following: One mast weatherhead installation, installed in accordance with Part II of Article 230, containing four continuous, insulated, color-coded feeder conductors, one of which shall be an equipment grounding conductorA rigid metal conduit, intermediate metal conduit, rigid polyvinyl chloride conduit, or other raceways identified for the location, from the disconnecting means in the mobile home to the underside of the mobile home, with provisions for the attachment to a suitable junction box or fitting to the raceway on the underside of the mobile home [with or without conductors as in 550.10(I)(1)]. The manufacturer shall provide written installation instructions stating the proper feeder conductor sizes for the raceway and the size of the junction box to be used.FIGURE 550.10(C) 50-Ampere, 125/250-Volt Receptacle and Attachment Plug Cap Configurations, 3-Pole, 4-Wire, Grounding-Types, Used for Mobile Home Supply Cords and Mobile Home Parks. [550.10(I)](https://2023.antflix.net#550.10(I)) | https://2023.antflix.net#550.10(I) |
Chaptewr 5 Special Occupancies | 550.11 | The branch-circuit equipment shall be permitted to be combined with the disconnecting means as a single assembly. Such a combination shall be permitted to be designated as a panelboard. If a fused panelboard is used, the maximum fuse size for the mains shall be plainly marked with lettering at least 6 mm (1/4 in.) high and visible when fuses are changed. Where plug fuses and fuseholders are used, they shall be tamper-resistant Type S, enclosed in dead-front fuse panelboards. Electrical panelboards containing circuit breakers shall also be dead-front type. Informational Note: See 110.22 concerning identification of each disconnecting means and each service, feeder, or branch circuit at the point where it originated and the type marking needed. [550.11](https://2023.antflix.net#550.11) | https://2023.antflix.net#550.11 |
Chaptewr 5 Special Occupancies | 550.11(A) | A single disconnecting means shall be provided in each mobile home consisting of a circuit breaker, or a switch and fuses and its accessories installed in a readily accessible location near the point of entrance of the supply cord or conductors into the mobile home. The main circuit breakers or fuses shall be plainly marked "Main." This equipment shall contain a solderless type of grounding connector or bar for the purposes of grounding, with sufficient terminals for all grounding conductors. The terminations of the grounded circuit conductors shall be insulated in accordance with 550.16(A). The disconnecting equipment shall have a rating not less than the calculated load. The distribution equipment, either circuit breaker or fused type, shall be located a minimum of 600 mm (24 in.) from the bottom of such equipment to the floor level of the mobile home. Informational Note: See 550.20(B) for information on disconnecting means for branch circuits designed to energize heating or air-conditioning equipment, or both, located outside the mobile home, other than room air conditioners. A panelboard shall be rated not less than 50 amperes and employ a 2-pole circuit breaker rated 40 amperes for a 40-ampere supply cord, or 50 amperes for a 50-ampere supply cord. A panelboard employing a disconnect switch and fuses shall be rated 60 amperes and shall employ a single 2-pole, 60-ampere fuseholder with 40- or 50-ampere main fuses for 40- or 50-ampere supply cords, respectively. The outside of the panelboard shall be plainly marked with the fuse size. The panelboard shall be located in an accessible location but shall not be located in a bathroom or a clothes closet. A clear working space at least 750 mm (30 in.) wide and 750 mm (30 in.) in front of the panelboard shall be provided. This space shall extend from the floor to the top of the panelboard. [550.11(A)](https://2023.antflix.net#550.11(A)) | https://2023.antflix.net#550.11(A) |
Chaptewr 5 Special Occupancies | 550.11(B) | Branch-circuit distribution equipment shall be installed in each mobile home and shall include overcurrent protection for each branch circuit consisting of either circuit breakers or fuses. The branch-circuit overcurrent devices shall be rated as follows:Not more than the circuit conductors; andNot more than 150 percent of the rating of a single appliance rated 13.3 amperes or more that is supplied by an individual branch circuit; butNot more than the overcurrent protection size and of the type marked on the air conditioner or other motor-operated appliance. [550.11(B)](https://2023.antflix.net#550.11(B)) | https://2023.antflix.net#550.11(B) |
Chaptewr 5 Special Occupancies | 550.11(C) | Where circuit breakers are provided for branch-circuit protection, 240-volt circuits shall be protected by a 2-pole common or companion trip, or by circuit breakers with identified handle ties. [550.11(C)](https://2023.antflix.net#550.11(C)) | https://2023.antflix.net#550.11(C) |
Chaptewr 5 Special Occupancies | 550.11(D) | A metal nameplate on the outside adjacent to the feeder assembly entrance shall read as follows: THIS CONNECTION FOR 120/240-VOLT,3-POLE, 4-WIRE, 60-HERTZ,___________ AMPERE SUPPLY The correct ampere rating shall be marked in the blank space. Exception: For manufactured homes, the manufacturer shall provide in its written installation instructions or in the data plate the minimum ampere rating of the feeder assembly or, where provided, the service-entrance conductors intended for connection to the manufactured home. The rating provided shall not be less than the minimum load calculated in accordance with 550.18. [550.11(D)](https://2023.antflix.net#550.11(D)) | https://2023.antflix.net#550.11(D) |
Chaptewr 5 Special Occupancies | 550.12 | The number of branch circuits required shall be determined in accordance with 550.12(A) through (E). [550.12](https://2023.antflix.net#550.12) | https://2023.antflix.net#550.12 |
Chaptewr 5 Special Occupancies | 550.12(A) | The number of branch circuits shall be based on 33 volt-amperes/m2 (3 VA/ft2) times outside dimensions of the mobile home (coupler excluded) divided by 120 volts to determine the number of 15- or 20-ampere lighting area circuits, for example, [550.12(A)] [550.12(A)](https://2023.antflix.net#550.12(A)) | https://2023.antflix.net#550.12(A) |
Chaptewr 5 Special Occupancies | 550.12(B) | In kitchens, pantries, dining rooms, and breakfast rooms, two or more 20-ampere small-appliance circuits, in addition to the number of circuits required elsewhere in this section, shall be provided for all receptacle outlets required by 550.13(D) in these rooms. Such circuits shall have no other outlets. Exception No. 1: Receptacle outlets installed solely for the electrical supply and support of an electric clock in any the rooms specified in 550.12(B) shall be permitted. Exception No. 2: Receptacle outlets installed to provide power for supplemental equipment and lighting on gas-fired ranges, ovens, or counter-mounted cooking units shall be permitted. Exception No. 3: A single receptacle for refrigeration equipment shall be permitted to be supplied from an individual branch circuit rated 15 amperes or greater. Countertop receptacle outlets installed in the kitchen shall be supplied by not less than two small-appliance circuit branch circuits, either or both of which shall be permitted to supply receptacle outlets in the kitchen and other locations specified in 550.12(B). [550.12(B)](https://2023.antflix.net#550.12(B)) | https://2023.antflix.net#550.12(B) |
Chaptewr 5 Special Occupancies | 550.12(C) | Where a laundry area is provided, a 20-ampere branch circuit shall be provided to supply the laundry receptacle outlet(s). This circuit shall have no other outlets. [550.12(C)](https://2023.antflix.net#550.12(C)) | https://2023.antflix.net#550.12(C) |
Chaptewr 5 Special Occupancies | 550.12(D) | (Including furnace, water heater, range, and central or room air conditioner, etc.). There shall be one or more circuits of adequate rating in accordance with the following: Informational Note: See Article 440 for central air conditioning.The ampere rating of fixed appliances shall be not over 50 percent of the circuit rating if lighting outlets (receptacles, other than kitchen, dining area, and laundry, considered as lighting outlets) are on the same circuit.For fixed appliances on a circuit without lighting outlets, the sum of rated amperes shall not exceed the branch-circuit rating. Motor loads or continuous loads shall not exceed 80 percent of the branch-circuit rating.The rating of a single cord-and-plug-connected appliance on a circuit having no other outlets shall not exceed 80 percent of the circuit rating.The rating of a range branch circuit shall be based on the range demand as specified for ranges in 550.18(B)(5). [550.12(D)](https://2023.antflix.net#550.12(D)) | https://2023.antflix.net#550.12(D) |
Chaptewr 5 Special Occupancies | 550.12(E) | Bathroom receptacle outlets shall be supplied by at least one 20-ampere branch circuit. Such circuits shall have no outlets other than as provided for in 550.13(E)(2). [550.12(E)](https://2023.antflix.net#550.12(E)) | https://2023.antflix.net#550.12(E) |
Chaptewr 5 Special Occupancies | 550.13(A) | All receptacle outlets shall comply with the following: Be of grounding typeBe installed according to 406.4Except where supplying specific appliances, be 15- or 20-ampere, 125-volt, either single or multiple type, and accept parallel-blade attachment plugs [550.13(A)](https://2023.antflix.net#550.13(A)) | https://2023.antflix.net#550.13(A) |
Chaptewr 5 Special Occupancies | 550.13(B) | Ground-fault circuit-interrupter protection shall be provided as required in 210.8(A). In addition, in the following areas within a mobile or manufactured home, GFCI protection is limited to 125-volt, 15- and 20-ampere receptacles or outlets: Compartments accessible from outside the unitBathrooms, including receptacles in luminairesKitchens, where receptacles are installed to serve countertop surfacesSinks, where receptacles are installed within 1.8 m (6 ft) from the top inside edge of the sinkDishwashersInformational Note: See 422.5(A) for information on protection of dishwashers. [550.13(B)](https://2023.antflix.net#550.13(B)) | https://2023.antflix.net#550.13(B) |
Chaptewr 5 Special Occupancies | 550.13(C) | A grounding-type receptacle outlet shall be provided for each cord-connected fixed appliance installed. [550.13(C)](https://2023.antflix.net#550.13(C)) | https://2023.antflix.net#550.13(C) |
Chaptewr 5 Special Occupancies | 550.13(D) | Except in the bath, closet, and hallway areas, receptacle outlets shall be installed at wall spaces 600 mm (2 ft) wide or more so that no point along the floor line is more than 1.8 m (6 ft) measured horizontally from an outlet in that space. In addition, a receptacle outlet shall be installed in the following locations: Over or adjacent to countertops in the kitchen [at least one on each side of the sink if countertops are on each side and are 300 mm (12 in.) or over in width].Adjacent to the refrigerator and freestanding gas-range space. A multiple-type receptacle shall be permitted to serve as the outlet for a countertop and a refrigerator.At countertop spaces for built-in vanities.At countertop spaces under wall-mounted cabinets.In the wall at the nearest point to where a bar-type counter attaches to the wall.In the wall at the nearest point to where a fixed room divider attaches to the wall.In laundry areas within 1.8 m (6 ft) of the intended location of the laundry appliance(s).At least one receptacle outlet located outdoors and accessible at grade level and not more than 2.0 m (61/2 ft) above grade. A receptacle outlet located in a compartment accessible from the outside of the unit shall be considered an outdoor receptacle.At least one receptacle outlet shall be installed in bathrooms within 900 mm (36 in.) of the outside edge of each basin. The receptacle outlet shall be located above or adjacent to the basin location. This receptacle shall be in addition to any receptacle that is a part of a luminaire or appliance. The receptacle shall not be enclosed within a bathroom cabinet or vanity. [550.13(D)](https://2023.antflix.net#550.13(D)) | https://2023.antflix.net#550.13(D) |
Chaptewr 5 Special Occupancies | 550.13(E) | For the connection of pipe heating cable(s), a receptacle outlet shall be located on the underside of the unit as follows: Within 600 mm (2 ft) of the cold water inlet.Connected to an interior branch circuit, other than a small-appliance branch circuit. It shall be permitted to use a bathroom receptacle circuit for this purpose.On a circuit where all of the outlets are on the load side of the ground-fault circuit interrupter.This outlet shall not be considered as the receptacle required by 550.13(D)(8). [550.13(E)](https://2023.antflix.net#550.13(E)) | https://2023.antflix.net#550.13(E) |
Chaptewr 5 Special Occupancies | 550.13(F) | Receptacle outlets shall not be permitted in the following locations: Receptacle outlets shall not be installed within or directly over a bathtub or shower space.A receptacle shall not be installed in a face-up position in any countertop.Receptacle outlets shall not be installed above electric baseboard heaters, unless provided for in the listing or manufacturer's instructions. [550.13(F)](https://2023.antflix.net#550.13(F)) | https://2023.antflix.net#550.13(F) |
Chaptewr 5 Special Occupancies | 550.13(G) | Receptacle outlets shall not be required in the following locations: In the wall space occupied by built-in kitchen or wardrobe cabinetsIn the wall space behind doors that can be opened fully against a wall surfaceIn room dividers of the lattice type that are less than 2.5 m (8 ft) long, not solid, and within 150 mm (6 in.) of the floorIn the wall space afforded by bar-type counters [550.13(G)](https://2023.antflix.net#550.13(G)) | https://2023.antflix.net#550.13(G) |
Chaptewr 5 Special Occupancies | 550.14(A) | Means shall be provided to securely fasten appliances when the mobile home is in transit. (See 550.16 for provisions on grounding.) [550.14(A)](https://2023.antflix.net#550.14(A)) | https://2023.antflix.net#550.14(A) |
Chaptewr 5 Special Occupancies | 550.14(B) | Every appliance shall be accessible for inspection, service, repair, or replacement without removal of permanent construction. [550.14(B)](https://2023.antflix.net#550.14(B)) | https://2023.antflix.net#550.14(B) |
Chaptewr 5 Special Occupancies | 550.14(C) | Listed pendant-type luminaires or pendant cords shall be permitted. [550.14(C)](https://2023.antflix.net#550.14(C)) | https://2023.antflix.net#550.14(C) |
Chaptewr 5 Special Occupancies | 550.14(D) | Where a luminaire is installed over a bathtub or in a shower stall, it shall be of the enclosed and gasketed type listed for wet locations. [550.14(D)](https://2023.antflix.net#550.14(D)) | https://2023.antflix.net#550.14(D) |
Chaptewr 5 Special Occupancies | 550.15 | Except as specifically limited in this section, the wiring methods and materials included in this Code shall be used in mobile homes. Where conductors are terminated, they shall be used with equipment listed and identified for the conductor materials. [550.15](https://2023.antflix.net#550.15) | https://2023.antflix.net#550.15 |
Chaptewr 5 Special Occupancies | 550.15(A) | Nonmetallic boxes shall be permitted only with nonmetallic cable or nonmetallic raceways. [550.15(A)](https://2023.antflix.net#550.15(A)) | https://2023.antflix.net#550.15(A) |
Chaptewr 5 Special Occupancies | 550.15(B) | Nonmetallic cable located 380 mm (15 in.) or less above the floor, if exposed, shall be protected from physical damage by covering boards, guard strips, or raceways. Cable likely to be damaged by stowage shall be so protected in all cases. [550.15(B)](https://2023.antflix.net#550.15(B)) | https://2023.antflix.net#550.15(B) |
Chaptewr 5 Special Occupancies | 550.15(C) | Metal-covered and nonmetallic cables shall be permitted to pass through the centers of the wide side of 2 by 4 studs. However, they shall be protected where they pass through 2 by 2 studs or at other studs or frames where the cable or armor would be less than 32 mm (11/4 in.) from the inside or outside surface of the studs where the wall covering materials are in contact with the studs. Steel plates on each side of the cable, or a tube, with not less than 1.35 mm (0.053 in.) wall thickness shall be required to protect the cable. These plates or tubes shall be securely held in place. [550.15(C)](https://2023.antflix.net#550.15(C)) | https://2023.antflix.net#550.15(C) |
Chaptewr 5 Special Occupancies | 550.15(D) | Where metal faceplates are used, the installation shall comply with 404.9(B) and 406.6(B). [550.15(D)](https://2023.antflix.net#550.15(D)) | https://2023.antflix.net#550.15(D) |
Chaptewr 5 Special Occupancies | 550.15(E) | Where a range, clothes dryer, or other appliance is connected by metal-covered cable or flexible metal conduit, a length of not less than 900 mm (3 ft) of unsupported cable or conduit shall be provided to service the appliance. The cable or flexible metal conduit shall be secured to the wall. Type NM or Type SE cable shall not be used to connect a range or dryer. This shall not prohibit the use of Type NM or Type SE cable between the branch-circuit overcurrent protective device and a junction box or range or dryer receptacle. [550.15(E)](https://2023.antflix.net#550.15(E)) | https://2023.antflix.net#550.15(E) |
Chaptewr 5 Special Occupancies | 550.15(F) | Where rigid metal conduit or intermediate metal conduit is terminated at an enclosure with a locknut and bushing connection, two locknuts shall be provided, one inside and one outside of the enclosure. Rigid nonmetallic conduit, electrical nonmetallic tubing, or surface raceway shall be permitted. All cut ends of conduit and tubing shall be reamed or otherwise finished to remove rough edges. [550.15(F)](https://2023.antflix.net#550.15(F)) | https://2023.antflix.net#550.15(F) |
Chaptewr 5 Special Occupancies | 550.15(G) | Switches shall be rated as follows: For lighting circuits, switches shall be rated not less than 10 amperes, 120 to 125 volts, and in no case less than the connected load.Switches for motor or other loads shall comply with 404.14. [550.15(G)](https://2023.antflix.net#550.15(G)) | https://2023.antflix.net#550.15(G) |
Chaptewr 5 Special Occupancies | 550.15(H) | Where outdoor or under-chassis line-voltage (120 volts, nominal, or higher) wiring is exposed, it shall be protected by a conduit or raceway identified for use in wet locations. The conductors shall be listed for use in wet locations.Where wiring is exposed to physical damage, it shall be protected by a raceway, conduit, or other means. [550.15(H)](https://2023.antflix.net#550.15(H)) | https://2023.antflix.net#550.15(H) |
Chaptewr 5 Special Occupancies | 550.15(I) | Boxes, fittings, and cabinets shall be securely fastened in place and shall be supported from a structural member of the home, either directly or by using a substantial brace. Exception: Snap-in-type boxes. Boxes provided with special wall or ceiling brackets and wiling devices with integral enclosures that securely fasten to walls or ceilings and are identified for the use shall be permitted without support from a structured member or brace. The testing and approval shall include the wall and ceiling construction systems for which the boxes and devices are intended to be used. [550.15(I)](https://2023.antflix.net#550.15(I)) | https://2023.antflix.net#550.15(I) |
Chaptewr 5 Special Occupancies | 550.15(J) | Appliances having branch-circuit terminal connections that operate at temperatures higher than 60°C (140°F) shall have circuit conductors as described in the following: Branch-circuit conductors having an insulation suitable for the temperature encountered shall be permitted to be run directly to the appliance.Conductors having an insulation suitable for the temperature encountered shall be run from the appliance terminal connection to a readily accessible outlet box placed at least 300 mm (1 ft) from the appliance. These conductors shall be in a suitable raceway or Type AC or MC cable of at least 450 mm (18 in.) but not more than 1.8 m (6 ft) in length. [550.15(J)](https://2023.antflix.net#550.15(J)) | https://2023.antflix.net#550.15(J) |
Chaptewr 5 Special Occupancies | 550.15(K) | Fittings and connectors that are intended to be concealed at the time of assembly shall be listed and identified for the interconnection of building components. Such fittings and connectors shall be equal to the wiring method employed in insulation, temperature rise, and fault-current withstanding and shall be capable of enduring the vibration and shock occurring in mobile home transportation. Informational Note: See 550.19 for interconnection of multiple section units. [550.15(K)](https://2023.antflix.net#550.15(K)) | https://2023.antflix.net#550.15(K) |
Chaptewr 5 Special Occupancies | 550.16 | Grounding of both electrical and nonelectrical metal parts in a mobile home shall be through connection to a grounding bus in the mobile home panelboard and shall be connected through the green-colored insulated conductor in the supply cord or the feeder wiring to the grounding bus in the service-entrance equipment located adjacent to the mobile home location. Neither the frame of the mobile home nor the frame of any appliance shall be connected to the grounded circuit conductor in the mobile home. Where the panelboard is the service equipment as permitted by 550.32(B), the neutral conductors and the equipment grounding bus shall be connected. [550.16](https://2023.antflix.net#550.16) | https://2023.antflix.net#550.16 |
Chaptewr 5 Special Occupancies | 550.16(A)(1) | The grounded circuit conductor shall be insulated from the equipment grounding conductors and from equipment enclosures and other grounded parts. The grounded circuit conductor terminals in the panelboard and in ranges, clothes dryers, counter-mounted cooking units, and wall-mounted ovens shall be insulated from the equipment enclosure. Bonding screws, straps, or buses in the panelboard or in appliances shall be removed and discarded. Where the panelboard is the service equipment as permitted by 550.32(B), the neutral conductors and the equipment grounding bus shall be connected. [550.16(A)(1)](https://2023.antflix.net#550.16(A)(1)) | https://2023.antflix.net#550.16(A)(1) |
Chaptewr 5 Special Occupancies | 550.16(A)(2) | Connections of ranges and clothes dryers with 120/240-volt, 3-wire ratings shall be made with 4-conductor cord and 3-pole, 4-wire, grounding-type plugs or by Type AC cable, Type MC cable, or conductors enclosed in flexible metal conduit. [550.16(A)(2)](https://2023.antflix.net#550.16(A)(2)) | https://2023.antflix.net#550.16(A)(2) |
Chaptewr 5 Special Occupancies | 550.16(B)(1) | The green-colored insulated grounding wire in the supply cord or permanent feeder wiring shall be connected to the grounding bus in the panelboard or disconnecting means. [550.16(B)(1)](https://2023.antflix.net#550.16(B)(1)) | https://2023.antflix.net#550.16(B)(1) |
Chaptewr 5 Special Occupancies | 550.16(B)(2) | In the electrical system, all exposed metal parts, enclosures, frames, luminaire canopies, and so forth, shall be effectively bonded to the grounding terminal or enclosure of the panelboard. [550.16(B)(2)](https://2023.antflix.net#550.16(B)(2)) | https://2023.antflix.net#550.16(B)(2) |
Chaptewr 5 Special Occupancies | 550.16(B)(3) | Cord-connected appliances, such as washing machines, clothes dryers, and refrigerators, and the electrical system of gas ranges and so forth, shall be grounded by means of a cord with an equipment grounding conductor and grounding-type attachment plug. [550.16(B)(3)](https://2023.antflix.net#550.16(B)(3)) | https://2023.antflix.net#550.16(B)(3) |
Chaptewr 5 Special Occupancies | 550.16(C)(1) | All exposed non—current-carrying metal parts that are likely to become energized shall be effectively bonded to the grounding terminal or enclosure of the panelboard. A bonding conductor shall be connected between the panelboard and an accessible terminal on the chassis. Chassis of multiple mobile home sections shall be bonded together with a solid copper, 8 AWG minimum, insulated or bare, bonding conductor with terminations in accordance with 250.8 and 250.12. [550.16(C)(1)](https://2023.antflix.net#550.16(C)(1)) | https://2023.antflix.net#550.16(C)(1) |
Chaptewr 5 Special Occupancies | 550.16(C)(2) | Grounding terminals shall be of the solderless type and listed as pressure-terminal connectors recognized for the wire size used. The bonding conductor shall be solid or stranded, insulated or bare, and shall be 8 AWG copper minimum, or equivalent. The bonding conductor shall be routed so as not to be exposed to physical damage. [550.16(C)(2)](https://2023.antflix.net#550.16(C)(2)) | https://2023.antflix.net#550.16(C)(2) |
Chaptewr 5 Special Occupancies | 550.16(C)(3) | Metallic gas, water, and waste pipes and metallic air-circulating ducts shall be considered bonded if they are connected to the terminal on the chassis [see 550.16(C)(1)] by clamps, solderless connectors, or by suitable grounding-type straps. [550.16(C)(3)](https://2023.antflix.net#550.16(C)(3)) | https://2023.antflix.net#550.16(C)(3) |
Chaptewr 5 Special Occupancies | 550.16(C)(4) | Any metallic roof and exterior covering shall be considered bonded if the following conditions are met: The metal panels overlap one another and are securely attached to the wood or metal frame parts by metallic fasteners.The lower panel of the metallic exterior covering is secured by metallic fasteners at a cross member of the chassis by two metal straps per mobile home unit or section at opposite ends.The bonding strap material shall be a minimum of 100 mm (4 in.) in width of material equivalent to the skin or a material of equal or better electrical conductivity. The straps shall be fastened with paint-penetrating fittings such as screws and star-washers or equivalent. [550.16(C)(4)](https://2023.antflix.net#550.16(C)(4)) | https://2023.antflix.net#550.16(C)(4) |
Chaptewr 5 Special Occupancies | 550.17(A) | The wiring of each mobile home shall be subjected to a 1-minute, 900-volt, dielectric strength test (with all switches closed) between live parts (including neutral conductor) and the mobile home ground. Alternatively, the test shall be permitted to be performed at 1080 volts for 1 second. This test shall be performed after branch circuits are complete and after luminaires or appliances are installed. Exception: Listed luminaires or appliances shall not be required to withstand the dielectric strength test. [550.17(A)](https://2023.antflix.net#550.17(A)) | https://2023.antflix.net#550.17(A) |
Chaptewr 5 Special Occupancies | 550.17(B) | Each mobile home shall be subjected to all of the following: An electrical continuity test to ensure that all exposed electrically conductive parts are properly bondedAn electrical operational test to demonstrate that all equipment, except water heaters and electric furnaces, is connected and in working orderElectrical polarity checks of permanently wired equipment and receptacle outlets to determine that connections have been properly made [550.17(B)](https://2023.antflix.net#550.17(B)) | https://2023.antflix.net#550.17(B) |
Chaptewr 5 Special Occupancies | 550.18 | The following method shall be employed in calculating the supply-cord and distribution-panelboard load for each feeder assembly for each mobile home in lieu of the procedure shown in Article 220 and shall be based on a 3-wire, 120/240-volt supply with 120-volt loads balanced between the two ungrounded conductors of the 3-wire system. [550.18](https://2023.antflix.net#550.18) | https://2023.antflix.net#550.18 |
Chaptewr 5 Special Occupancies | 550.18(A)(1) | Length times width of mobile home floor (outside dimensions) times 33 volt-amperes/m2 (3 VA/ft2)- for example, length × width × 3 = lighting voltamperes. [550.18(A)(1)](https://2023.antflix.net#550.18(A)(1)) | https://2023.antflix.net#550.18(A)(1) |
Chaptewr 5 Special Occupancies | 550.18(A)(2) | Number of circuits times 1500 volt-amperes for each 20-ampere appliance receptacle circuit - for example, number of circuits × 1500 = small-appliance volt-amperes. [550.18(A)(2)](https://2023.antflix.net#550.18(A)(2)) | https://2023.antflix.net#550.18(A)(2) |
Chaptewr 5 Special Occupancies | 550.18(A)(3) | 1500 volt-amperes. [550.18(A)(3)](https://2023.antflix.net#550.18(A)(3)) | https://2023.antflix.net#550.18(A)(3) |
Chaptewr 5 Special Occupancies | 550.18(A)(4) | Lighting volt-amperes plus small-appliance volt-amperes plus laundry area volt-amperes equals total volt-amperes. [550.18(A)(4)](https://2023.antflix.net#550.18(A)(4)) | https://2023.antflix.net#550.18(A)(4) |
Chaptewr 5 Special Occupancies | 550.18(A)(5) | First 3000 total volt-amperes at 100 percent plus remainder at 35 percent equals volt-amperes to be divided by 240 volts to obtain current (amperes) per leg. [550.18(A)(5)](https://2023.antflix.net#550.18(A)(5)) | https://2023.antflix.net#550.18(A)(5) |
Chaptewr 5 Special Occupancies | 550.18(B) | Total load for determining power supply is the sum of the following:
Lighting and small-appliance load as calculated in 550.18(A)(5).
Nameplate amperes for motors and heater loads (exhaust fans, air conditioners, electric, gas, or oil heating). Omit smaller of the heating and cooling loads, except include blower motor if used as air-conditioner evaporator motor. Where an air conditioner is not installed and a 40-ampere power-supply cord is provided, allow 15 amperes per leg for air conditioning.
Twenty-five percent of current of largest motor in 550.18(B)(2).
Total of nameplate amperes for waste disposer, dishwasher, water heater, clothes dryer, wall-mounted oven, cooking units. Where the number of these appliances exceeds three, use 75 percent of total.
Derive amperes for freestanding range (as distinguished from separate ovens and cooking units) by dividing the following values by 240 volts as shown in Table 550.18(B).
If outlets or circuits are provided for other than factory-installed appliances, include the anticipated load.
Informational Note: See Informative Annex D, Example D11, for an illustration of the application of this calculation. [550.18(B)](https://2023.antflix.net#550.18(B)) | https://2023.antflix.net#550.18(B) |
Chaptewr 5 Special Occupancies | 550.18(C) | The optional method for calculating lighting and appliance load shown in 220.82 shall be permitted. Table 550.18(B) Freestanding Range Load Nameplate Rating(watts) Use(volt-amperes) 0—10,000 80 percent of rating Over 10,000—12,500 8,000 Over 12,500—13,500 8,400 Over 13,500—14,500 8,800 Over 14,500—15,500 9,200 Over 15,500—16,500 9,600 Over 16,500—17,500 10,000 [550.18(C)](https://2023.antflix.net#550.18(C)) | https://2023.antflix.net#550.18(C) |
Chaptewr 5 Special Occupancies | 550.19(A) | Approved and listed fixed-type wiring methods shall be used to join portions of a circuit that must be electrically joined and are located in adjacent sections after the home is installed on its support foundation. The circuit's junction shall be accessible for disassembly when the home is prepared for relocation. Informational Note: See 550.15 (K) for component interconnections. [550.19(A)](https://2023.antflix.net#550.19(A)) | https://2023.antflix.net#550.19(A) |
Chaptewr 5 Special Occupancies | 550.19(B) | Expandable or multiunit manufactured homes, not having permanently installed feeders, that are to be moved from one location to another shall be permitted to have disconnecting means with branch-circuit protective equipment in each unit when so located that after assembly or joining together of units, the requirements of 550.10 will be met. [550.19(B)](https://2023.antflix.net#550.19(B)) | https://2023.antflix.net#550.19(B) |
Chaptewr 5 Special Occupancies | 550.20(A) | Outdoor luminaires and equipment shall be listed for wet locations or outdoor use. Outdoor receptacles shall comply with 406.9. Where located on the underside of the home or located under roof extensions or similarly protected locations, outdoor luminaires and equipment shall be listed for use in damp locations. [550.20(A)](https://2023.antflix.net#550.20(A)) | https://2023.antflix.net#550.20(A) |
Chaptewr 5 Special Occupancies | 550.20(B) | A mobile home provided with a branch circuit designed to energize outside heating equipment, air-conditioning equipment, or both, located outside the mobile home, other than room air conditioners, shall have such branch-circuit conductors terminate in a listed outlet box, or disconnecting means, located on the outside of the mobile home. A label shall be permanently affixed adjacent to the outlet box and shall contain the following information: THIS CONNECTION IS FOR HEATINGAND/OR AIR-CONDITIONING EQUIPMENT.THE BRANCH CIRCUIT IS RATED AT NOT MORE THAN _______ AMPERES, AT ______ VOLTS, 60 HERTZ,CONDUCTOR AMPACITY.A DISCONNECTING MEANS SHALL BE LOCATEDWITHIN SIGHT OF THE EQUIPMENT. The correct voltage and ampere rating shall be given. The tag shall be not less than 0.51 mm (0.020 in.) thick etched brass, stainless steel, anodized or alclad aluminum, or equivalent. The tag shall not be less than 75 mm by 45 mm (3 in. by 13/4 in.) minimum size. [550.20(B)](https://2023.antflix.net#550.20(B)) | https://2023.antflix.net#550.20(B) |
Chaptewr 5 Special Occupancies | 550.25 | All 120-volt, single-phase, 15- and 20-ampere branch circuits supplying outlets or devices installed in mobile homes and manufactured homes shall comply with 210.12 [550.25](https://2023.antflix.net#550.25) | https://2023.antflix.net#550.25 |
Chaptewr 5 Special Occupancies | 550.30 | The mobile home park secondary electrical distribution system to mobile home lots shall be single-phase, 120/240 volts, nominal. [550.30](https://2023.antflix.net#550.30) | https://2023.antflix.net#550.30 |
Chaptewr 5 Special Occupancies | 550.31 | Park electrical wiring systems shall be calculated (at 120/240 volts) on the larger of the following: 16,000 volt-amperes for each mobile home lotThe load calculated in accordance with 550.18 for the largest typical mobile home that each lot will acceptIt shall be permissible to calculate the feeder or service load in accordance with Table 550.31. No demand factor shall be allowed for any other load, except as provided in this Code.Table 550.31 Demand Factors for Services and Feeders Number of Mobile Homes Demand Factor (%) 1 100 2 55 3 44 4 39 5 33 6 29 7—9 28 10—12 27 13—15 26 16—21 25 22—40 24 41—60 23 61 and over 22 [550.31](https://2023.antflix.net#550.31) | https://2023.antflix.net#550.31 |
Chaptewr 5 Special Occupancies | 550.32(A) | The mobile home service equipment shall not be mounted in or on the mobile home. The service equipment shall be rated not less than that required in accordance with 550.32(C), mounted in a readily accessible outdoor location, and within sight from the mobile home it serves. The mobile home service disconnect shall be permitted to be used as the emergency disconnect in accordance with 230.85. [550.32(A)](https://2023.antflix.net#550.32(A)) | https://2023.antflix.net#550.32(A) |
Chaptewr 5 Special Occupancies | 550.32(B) | The manufactured home service equipment shall be permitted to be installed in or on a manufactured home, provided that all of the following conditions are met: The manufacturer shall include in its written installation instructions information indicating that the home shall be secured in place by an anchoring system or installed on and secured to a permanent foundation.The installation of the service shall comply with Part I through Part VII of Article 230.Means shall be provided for the connection of a grounding electrode conductor to the service equipment and routing it outside the structure.Bonding and grounding of the service shall be in accordance with Part I through Part V of Article 250.The manufacturer shall include in its written installation instructions one method of grounding the service equipment at the installation site. The instructions shall clearly state that other methods of grounding are found in Article 250.The minimum size grounding electrode conductor shall be specified in the instructions.A warning label shall be mounted on or adjacent to the service equipment. The label shall meet the requirements in 110.21(B) and shall state the following:WARNINGDO NOT PROVIDE ELECTRICAL POWER UNTIL THE GROUNDING ELECTRODE(S)IS INSTALLED AND CONNECTED (SEE INSTALLATION INSTRUCTIONS).Where the service equipment is not installed in or on the unit, the installation shall comply with the other requirements of this section. [550.32(B)](https://2023.antflix.net#550.32(B)) | https://2023.antflix.net#550.32(B) |
Chaptewr 5 Special Occupancies | 550.32(C) | Mobile home service equipment shall be rated at not less than 100 amperes at 120/240 volts, and provisions shall be made for connecting a mobile home feeder assembly by a permanent wiring method. Power outlets used as mobile home service equipment shall also be permitted to contain receptacles rated up to 50 amperes with appropriate overcurrent protection. Fifty-ampere receptacles shall conform to the configuration shown in Figure 550.10(C). Informational Note: See ANSI/NEMA WD 6-2016, Wiring Devices - Dimensional Specifications, Figure 14-50, for complete details of the 50-ampere plug and receptacle configuration. [550.32(C)](https://2023.antflix.net#550.32(C)) | https://2023.antflix.net#550.32(C) |
Chaptewr 5 Special Occupancies | 550.32(D) | Means for connecting a mobile home accessory building or structure or additional electrical equipment located outside a mobile home by a fixed wiring method shall be provided in either the mobile home service equipment or the local external disconnecting means permitted in 550.32(A). [550.32(D)](https://2023.antflix.net#550.32(D)) | https://2023.antflix.net#550.32(D) |
Chaptewr 5 Special Occupancies | 550.32(E) | Receptacles located outside a mobile or manufactured home shall be provided with ground-fault circuit-interrupter protection as specified by 210.8(A). Where receptacles provide power to a mobile or manufactured home in accordance with 550.10, ground-fault circuit-interrupter protection shall not be required. [550.32(E)](https://2023.antflix.net#550.32(E)) | https://2023.antflix.net#550.32(E) |
Chaptewr 5 Special Occupancies | 550.32(F) | Outdoor mobile home disconnecting means shall be installed so the bottom of the enclosure containing the disconnecting means is not less than 600 mm (2 ft) above finished grade or working platform. The disconnecting means shall be installed so that the center of the grip of the operating handle, when in the highest position, is not more than 2.0 m (6 ft 7 in.) above the finished grade or working platform. [550.32(F)](https://2023.antflix.net#550.32(F)) | https://2023.antflix.net#550.32(F) |
Chaptewr 5 Special Occupancies | 550.32(G) | Where a 125/250-volt receptacle is used in mobile home service equipment, the service equipment shall be marked as follows: TURN DISCONNECTING SWITCH ORCIRCUIT BREAKER OFF BEFORE INSERTINGOR REMOVING PLUG. PLUG MUST BE FULLYINSERTED OR REMOVED. The marking shall be located on the service equipment adjacent to the receptacle outlet. [550.32(G)](https://2023.antflix.net#550.32(G)) | https://2023.antflix.net#550.32(G) |
Chaptewr 5 Special Occupancies | 550.33(A) | The feeder assembly, including the disconnecting means, shall not be mounted in or on the mobile home. A manufactured home feeder disconnecting means shall be permitted to be installed in or on the manufactured home in accordance with the requirements of 550.32(B). The feeder equipment shall be rated not less than that required in 550.32(C), mounted in a readily accessible outdoor location, and within sight from the mobile home or manufactured home it serves. Grounding of the disconnecting means shall be in accordance with 250.32. [550.33(A)](https://2023.antflix.net#550.33(A)) | https://2023.antflix.net#550.33(A) |
Chaptewr 5 Special Occupancies | 550.33(B) | Feeder conductors shall comply with the following: Feeder conductors shall consist of either a listed cord, factory installed in accordance with 550.10(B), or a permanently installed feeder consisting of four insulated, color-coded conductors that shall be identified by the factory or field marking of the conductors in compliance with 310.6. Equipment grounding conductors shall not be identified by stripping the insulation.Feeder conductors shall be installed in compliance with 250.32(B).Exception: An existing feeder installed without an equipment grounding conductor shall be permitted to comply with 250.32(B)(1) Exception No. 1. [550.33(B)](https://2023.antflix.net#550.33(B)) | https://2023.antflix.net#550.33(B) |
Chaptewr 5 Special Occupancies | 550.33(C) | Mobile home and manufactured home feeder circuit conductors shall have a capacity not less than the loads supplied, shall have an ampacity of not less than 100 amperes, and shall be permitted to be sized in accordance with 310.12. [550.33(C)](https://2023.antflix.net#550.33(C)) | https://2023.antflix.net#550.33(C) |
Chaptewr 5 Special Occupancies | 551.1 | This article covers 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. Informational Note: See NFPA 1192-2021, Standard on Recreational Vehicles, and ANSI/RVIA LV-2020, Standard for Low Voltage Systems in Conversion and Recreational Vehicles, for information on low-voltage systems. [551.1](https://2023.antflix.net#551.1) | https://2023.antflix.net#551.1 |
Chaptewr 5 Special Occupancies | 551.3 | The electrical datum plane distance(s) is determined by the normal high water level and encompasses the areas subject to tidal movement and areas in which the water level is affected by the conditions such as climate (rain or snowfall) or by human intervention (the opening and closing of dams or floodgates). The distance does not consider extremes due to natural or manmade disasters. [551.3](https://2023.antflix.net#551.3) | https://2023.antflix.net#551.3 |
Chaptewr 5 Special Occupancies | 551.3(A) | In land areas subject to tidal fluctuation, the electrical datum plane shall be a horizontal plane that is 606 mm (2 ft) above the highest high tide level for the area occurring under normal circumstances. [551.3(A)](https://2023.antflix.net#551.3(A)) | https://2023.antflix.net#551.3(A) |
Chaptewr 5 Special Occupancies | 551.3(B) | In land areas not subject to tidal fluctuation, the electrical datum plane shall be a horizontal plane that is 606 mm (2 ft) above the normal high water level for the area occurring under normal circumstances. [551.3(B)](https://2023.antflix.net#551.3(B)) | https://2023.antflix.net#551.3(B) |
Chaptewr 5 Special Occupancies | 551.4(A) | A recreational vehicle not used for the purposes as defined in 551.2 shall not be required to meet the requirements of Part IV pertaining to the number or capacity of circuits required. It shall, however, meet all other applicable requirements of this article if the recreational vehicle is provided with an electrical installation intended to be energized from a 120-volt, 208Y/120-volt, or 120/240-volt, nominal, ac power-supply system. [551.4(A)](https://2023.antflix.net#551.4(A)) | https://2023.antflix.net#551.4(A) |
Chaptewr 5 Special Occupancies | 551.4(B) | This article covers combination electrical systems, generator installations, and 120-volt, 208Y/120-volt, or 120/240-volt, nominal, systems. Informational Note: See NFPA 1192-2021, Standard on Recreational Vehicles, and ANSI/RVIA 12V-2020, Standard for Low Voltage Systems in Conversion and Recreational Vehicles, for information on low-voltage systems. [551.4(B)](https://2023.antflix.net#551.4(B)) | https://2023.antflix.net#551.4(B) |
Chaptewr 5 Special Occupancies | 551.4(C) | Labels required by Article 551 shall be made of etched, metal-stamped, or embossed brass; stainless steel; plastic laminates not less than 0.13 mm (0.005 in.) thick; or anodized or alclad aluminum not less than 0.5 mm (0.020 in.) thick or the equivalent. Informational Note: See ANSI Z535.4-2011, Product Safety Signs and Labels, for guidance on other label criteria used in the recreational vehicle industry. [551.4(C)](https://2023.antflix.net#551.4(C)) | https://2023.antflix.net#551.4(C) |
Chaptewr 5 Special Occupancies | 551.20(A) | Vehicle wiring suitable for connection to a battery or dc supply source shall be permitted to be connected to a 120-volt source, provided the entire wiring system and equipment are rated and installed in full conformity with Parts I, II, III, IV, and V requirements of this article covering 120-volt electrical systems. Circuits fed from ac transformers shall not supply dc appliances. [551.20(A)](https://2023.antflix.net#551.20(A)) | https://2023.antflix.net#551.20(A) |
Chaptewr 5 Special Occupancies | 551.20(B) | The 120-volt ac side of the voltage converter shall be wired in full conformity with the requirements of Parts I, II, and IV of this article for 120-volt electrical systems. Exception: Converters supplied as an integral part of a listed appliance shall not be subject to 551.20(B). All converters and transformers shall be listed for use in recreational vehicles and designed or equipped to provide overtemperature protection. To determine the converter rating, the following percentages shall be applied to the total connected load, including average battery-charging rate, of all 12-volt equipment: The first 20 amperes of load at 100 percent plus The second 20 amperes of load at 50 percent plus All load above 40 amperes at 25 percent Exception: A low-voltage appliance that is controlled by a momentary switch (normally open) that has no means for holding in the closed position or refrigerators with a 120-volt function shall not be considered as a connected load when determining the required converter rating. Momentarily energized appliances shall be limited to those used to prepare the vehicle for occupancy or travel. [551.20(B)](https://2023.antflix.net#551.20(B)) | https://2023.antflix.net#551.20(B) |
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