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Chaptewr 5 Special Occupancies | 551.20(C) | The non—current-carrying metal enclosure of the voltage converter shall be connected to the frame of the vehicle with a minimum 8 AWG copper conductor. The voltage converter shall be provided with a separate chassis bonding conductor that shall not be used as a current-carrying conductor. [551.20(C)](https://2023.antflix.net#551.20(C)) | https://2023.antflix.net#551.20(C) |
Chaptewr 5 Special Occupancies | 551.20(D) | Fixtures, including luminaires, or appliances having both 120-volt and low-voltage connections shall be listed for dual voltage. [551.20(D)](https://2023.antflix.net#551.20(D)) | https://2023.antflix.net#551.20(D) |
Chaptewr 5 Special Occupancies | 551.20(E) | Autotransformers shall not be used. [551.20(E)](https://2023.antflix.net#551.20(E)) | https://2023.antflix.net#551.20(E) |
Chaptewr 5 Special Occupancies | 551.20(F) | Where a recreational vehicle is equipped with an ac system, a low-voltage system, or both, receptacles and plug caps of the low-voltage system shall differ in configuration from those of the ac system. Where a vehicle equipped with a battery or other low-voltage system has an external connection for low-voltage power, the connector shall have a configuration that will not accept ac power. [551.20(F)](https://2023.antflix.net#551.20(F)) | https://2023.antflix.net#551.20(F) |
Chaptewr 5 Special Occupancies | 551.30(A) | Generators shall be mounted in such a manner as to be effectively bonded to the recreational vehicle chassis. The connection of the electrical system produced by the generator shall provide an effective ground-fault return path when operational. [551.30(A)](https://2023.antflix.net#551.30(A)) | https://2023.antflix.net#551.30(A) |
Chaptewr 5 Special Occupancies | 551.30(B) | Equipment shall be installed to ensure that the current-carrying conductors from the engine generator and from an outside source are not connected to a vehicle circuit at the same time. Automatic transfer switches in such applications shall be listed for use in one of the following: Emergency systemsOptional standby systemsReceptacles used as disconnecting means shall be accessible (as applied to wiring methods) and capable of interrupting their rated current without hazard to the operator. [551.30(B)](https://2023.antflix.net#551.30(B)) | https://2023.antflix.net#551.30(B) |
Chaptewr 5 Special Occupancies | 551.30(C) | Storage batteries and internal-combustion-driven generator units (subject to the provisions of this Code) shall be secured in place to avoid displacement from vibration and road shock. [551.30(C)](https://2023.antflix.net#551.30(C)) | https://2023.antflix.net#551.30(C) |
Chaptewr 5 Special Occupancies | 551.30(D) | Compartments accommodating internal-combustion-driven generator units shall be provided with ventilation in accordance with instructions provided by the manufacturer of the generator unit. Informational Note: See NFPA 1192-2021, Standard on Recreational Vehicles, for generator compartment construction requirements. [551.30(D)](https://2023.antflix.net#551.30(D)) | https://2023.antflix.net#551.30(D) |
Chaptewr 5 Special Occupancies | 551.30(E) | The supply conductors from the engine generator to the first termination on the vehicle shall be of the stranded type and be installed in listed flexible conduit or listed liquidtight flexible conduit. The point of first termination shall be in one of the following: PanelboardJunction box with a blank coverJunction box with a receptacleEnclosed transfer switchReceptacle assembly listed in conjunction with the generatorThe panelboard, enclosed transfer switch, or junction box with a receptacle shall be installed within 450 mm (18 in.) of the point of entry of the supply conductors into the vehicle. A junction box with a blank cover shall be mounted on the compartment wall inside or outside the compartment; to any part of the generator-supporting structure (but not to the generator); to the vehicle floor on the outside of the vehicle; or within 450 mm (18 in.) of the point of entry of the supply conductors into the vehicle. A receptacle assembly listed in conjunction with the generator shall be mounted in accordance with its listing. [551.30(E)](https://2023.antflix.net#551.30(E)) | https://2023.antflix.net#551.30(E) |
Chaptewr 5 Special Occupancies | 551.31(A) | Where a multiple supply system consisting of an alternate power source and a power-supply cord is installed, the feeder from the alternate power source shall be protected by an overcurrent protective device. Installation shall be in accordance with 551.30(A), 551.30(B), and 551.40. [551.31(A)](https://2023.antflix.net#551.31(A)) | https://2023.antflix.net#551.31(A) |
Chaptewr 5 Special Occupancies | 551.31(B) | The multiple supply sources shall not be required to be of the same capacity. [551.31(B)](https://2023.antflix.net#551.31(B)) | https://2023.antflix.net#551.31(B) |
Chaptewr 5 Special Occupancies | 551.31(C) | If an alternate power source exceeds 30 amperes, 120 volts, nominal, it shall be permissible to wire it as a 120-volt, nominal, system, a 208Y/120-volt, nominal, system, or a 120/240-volt, nominal, system, provided an overcurrent protective device of the proper rating is installed in the feeder. [551.31(C)](https://2023.antflix.net#551.31(C)) | https://2023.antflix.net#551.31(C) |
Chaptewr 5 Special Occupancies | 551.31(D) | The external feeder assembly shall be permitted to be less than the calculated load but not less than 30 amperes and shall have overcurrent protection not greater than the capacity of the external feeder assembly. [551.31(D)](https://2023.antflix.net#551.31(D)) | https://2023.antflix.net#551.31(D) |
Chaptewr 5 Special Occupancies | 551.32 | Other sources of ac power, such as inverters, motor generators, or engine generators, shall be listed for use in recreational vehicles and shall be installed in accordance with the terms of the listing. Other sources of ac power shall be wired in full conformity with the requirements in Parts I, II, III, IV, and V of this article covering 120-volt electrical systems. [551.32](https://2023.antflix.net#551.32) | https://2023.antflix.net#551.32 |
Chaptewr 5 Special Occupancies | 551.33 | Transfer equipment, if not integral with the listed power source, shall be installed to ensure that the current-carrying conductors from other sources of ac power and from an outside source are not connected to the vehicle circuit at the same time. Automatic transfer switches in such applications shall be listed for use in one of the following: Emergency systemsOptional standby systems [551.33](https://2023.antflix.net#551.33) | https://2023.antflix.net#551.33 |
Chaptewr 5 Special Occupancies | 551.40(A) | The electrical equipment and material of recreational vehicles indicated for connection to a wiring system rated 120 volts, nominal, 2-wire with equipment grounding conductor, or a wiring system rated 120/240 volts, nominal, 3-wire with equipment grounding conductor, shall be listed and installed in accordance with Parts I, II, III, IV, and V of this article. Electrical equipment connected line-to-line shall have a nominal voltage rating of 208-230 volts. [551.40(A)](https://2023.antflix.net#551.40(A)) | https://2023.antflix.net#551.40(A) |
Chaptewr 5 Special Occupancies | 551.40(B) | Electrical materials, devices, appliances, fittings, and other equipment installed in, intended for use in, or attached to the recreational vehicle shall be listed. All products shall be used only in the manner in which they have been tested and found suitable for the intended use. [551.40(B)](https://2023.antflix.net#551.40(B)) | https://2023.antflix.net#551.40(B) |
Chaptewr 5 Special Occupancies | 551.40(C) | The internal wiring of a recreational vehicle having only one 15- or 20-ampere branch circuit as permitted in 551.42(A) and (B) shall have ground-fault circuit-interrupter protection for personnel. The ground-fault circuit interrupter shall be installed at the point where the power supply assembly terminates within the recreational vehicle. Where a separable cord set is not employed, the ground-fault circuit interrupter shall be permitted to be an integral part of the attachment plug of the feeder assembly. The ground-fault circuit interrupter shall provide protection also under the conditions of an open grounded circuit conductor, interchanged circuit conductors, or both. [551.40(C)](https://2023.antflix.net#551.40(C)) | https://2023.antflix.net#551.40(C) |
Chaptewr 5 Special Occupancies | 551.40(D) | Each recreational vehicle shall have a listed grounding monitor interrupter permanently installed between the feeder assembly connection to the vehicle and before either a transfer switch if installed or the panelboard. This requirement shall become effective January 1, 2026. [551.40(D)](https://2023.antflix.net#551.40(D)) | https://2023.antflix.net#551.40(D) |
Chaptewr 5 Special Occupancies | 551.41(A) | 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. Exception No. 1: Bath and hallway areas shall not be required to comply with 551.41(A). Exception No. 2: Wall spaces occupied by kitchen cabinets, wardrobe cabinets, built-in furniture, behind doors that can open fully against a wall surface, or similar facilities shall not be required to comply with 551.41(A). Exception No. 3: Wall spaces in the special transportation area of a recreational vehicle designed to transport internal combustion vehicles shall not be required to comply with 551.41(A). [551.41(A)](https://2023.antflix.net#551.41(A)) | https://2023.antflix.net#551.41(A) |
Chaptewr 5 Special Occupancies | 551.41(B) | Receptacle outlets shall be installed as follows: 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 and depth].Adjacent to the refrigerator and gas range space, except where a gas-fired refrigerator or cooking appliance, requiring no external electrical connection, is factory installed.Adjacent to countertop spaces of 300 mm (12 in.) or more in width and depth that cannot be reached from a receptacle required in 551.41(B)(1) by a cord of 1.8 m (6 ft) without crossing a traffic area, cooking appliance, or sink.Rooftop decks that are accessible from inside the recreational vehicle shall have at least one receptacle installed within the perimeter of the rooftop deck. The receptacle shall not be located more than 1.2 m (4 ft) above the balcony, deck, or porch surface. The receptacle shall comply with the requirements of 406.9(B) for wet locations.A special transportation area of recreational vehicles designed to transport internal combustion engine vehicles shall have at least one receptacle installed. [551.41(B)](https://2023.antflix.net#551.41(B)) | https://2023.antflix.net#551.41(B) |
Chaptewr 5 Special Occupancies | 551.41(C) | Where provided, each 125-volt, single-phase, 15- or 20-ampere receptacle outlet shall have ground-fault circuit-interrupter protection for personnel in the following locations: Adjacent to a bathroom lavatoryWhere the receptacles are installed to serve the countertop surfaces and are within 1.8 m (6 ft) of any lavatory or sinkException No. 1: Receptacles installed for appliances in dedicated spaces, such as for disposals, refrigerators, and freezers shall not require ground-fault circuit-interrupter protection.Exception No. 2: Single receptacles for interior connections of expandable room sections shall not require ground-fault circuit-interrupter protection.Exception No. 3: De-energized receptacles that are within 1.8 m (6 ft) of any sink or lavatory due to the retraction of the expandable room section shall not require ground-fault circuit-interrupter protection.In the area occupied by a toilet, shower, tub, or any combination thereofOn the exterior of the vehicleException: Receptacles that are located inside of an access panel that is installed on the exterior of the vehicle to supply power for an installed appliance shall not be required to have ground-fault circuit-interrupter protection.In the special transportation area of a recreational vehicle that is separated from the living area by a wallThe receptacle outlet shall be permitted in a listed luminaire. A receptacle outlet shall not be installed in a tub or combination tub—shower compartment. [551.41(C)](https://2023.antflix.net#551.41(C)) | https://2023.antflix.net#551.41(C) |
Chaptewr 5 Special Occupancies | 551.41(D) | A receptacle shall not be installed in a face-up position in any countertop or similar horizontal surface. [551.41(D)](https://2023.antflix.net#551.41(D)) | https://2023.antflix.net#551.41(D) |
Chaptewr 5 Special Occupancies | 551.42 | Each recreational vehicle containing an ac electrical system shall contain one of the circuit arrangements in 551.42(A) through (D). [551.42](https://2023.antflix.net#551.42) | https://2023.antflix.net#551.42 |
Chaptewr 5 Special Occupancies | 551.42(A) | One 15-ampere circuit to supply lights, receptacle outlets, and fixed appliances. Such recreational vehicles shall be equipped with one 15-ampere switch and fuse or one 15-ampere circuit breaker. [551.42(A)](https://2023.antflix.net#551.42(A)) | https://2023.antflix.net#551.42(A) |
Chaptewr 5 Special Occupancies | 551.42(B) | One 20-ampere circuit to supply lights, receptacle outlets, and fixed appliances. Such recreational vehicles shall be equipped with one 20-ampere switch and fuse or one 20-ampere circuit breaker. [551.42(B)](https://2023.antflix.net#551.42(B)) | https://2023.antflix.net#551.42(B) |
Chaptewr 5 Special Occupancies | 551.42(C) | Two to five 15- or 20-ampere circuits to supply lights, receptacle outlets, and fixed appliances shall be permitted. Such recreational vehicles shall be permitted to be equipped with panelboards rated 120 volts maximum or 120/240 volts maximum and listed for 30-ampere application supplied by the appropriate feeder assemblies. Not more than two 120-volt thermostatically controlled appliances shall be installed in such systems unless appliance isolation switching, energy management systems, or similar methods are used. Exception No. 1: Additional 15- or 20-ampere circuits shall be permitted where a listed energy management system rated at 30-amperes maximum is employed within the system. Exception No. 2: Six 15- or 20-ampere circuits shall be permitted without employing an energy management system, provided that the added sixth circuit serves only the power converter, and the combined load of all six circuits does not exceed the allowable load that was designed for use by the original five circuits. Informational Note: See 210.23(B) for permissible loads. See 551.45(C) for main disconnect and overcurrent protection requirements. [551.42(C)](https://2023.antflix.net#551.42(C)) | https://2023.antflix.net#551.42(C) |
Chaptewr 5 Special Occupancies | 551.42(D) | A 50-ampere, 120/208-240-volt feeder assembly and a minimum 50-ampere-rated panelboard shall be used where six or more circuits are employed. The load distribution shall ensure a reasonable current balance between phases. [551.42(D)](https://2023.antflix.net#551.42(D)) | https://2023.antflix.net#551.42(D) |
Chaptewr 5 Special Occupancies | 551.43(A) | 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 and supplied by an individual branch circuit, butNot more than the overcurrent protection size marked on an air conditioner or other motor-operated appliances [551.43(A)](https://2023.antflix.net#551.43(A)) | https://2023.antflix.net#551.43(A) |
Chaptewr 5 Special Occupancies | 551.43(B) | A 20-ampere fuse or circuit breaker shall be permitted for protection for fixtures, including luminaires, leads, cords, or small appliances, and 14 AWG tap conductors, not over 1.8 m (6 ft) long for recessed luminaires. [551.43(B)](https://2023.antflix.net#551.43(B)) | https://2023.antflix.net#551.43(B) |
Chaptewr 5 Special Occupancies | 551.43(C) | If more than one receptacle or load is on a branch circuit, 15-ampere receptacles shall be permitted to be protected by a 20-ampere fuse or circuit breaker. [551.43(C)](https://2023.antflix.net#551.43(C)) | https://2023.antflix.net#551.43(C) |
Chaptewr 5 Special Occupancies | 551.44 | Each recreational vehicle shall have only one of the main feeder assemblies covered in 551.44(A) through (D). [551.44](https://2023.antflix.net#551.44) | https://2023.antflix.net#551.44 |
Chaptewr 5 Special Occupancies | 551.44(A) | Recreational vehicles wired in accordance with 551.42(A) shall use a listed 15-ampere or larger main feeder assembly. [551.44(A)](https://2023.antflix.net#551.44(A)) | https://2023.antflix.net#551.44(A) |
Chaptewr 5 Special Occupancies | 551.44(B) | Recreational vehicles wired in accordance with 551.42(B) shall use a listed 20-ampere or larger main feeder assembly. [551.44(B)](https://2023.antflix.net#551.44(B)) | https://2023.antflix.net#551.44(B) |
Chaptewr 5 Special Occupancies | 551.44(C) | Recreational vehicles wired in accordance with 551.42(C) shall use a listed 30-ampere or larger main feeder assembly. [551.44(C)](https://2023.antflix.net#551.44(C)) | https://2023.antflix.net#551.44(C) |
Chaptewr 5 Special Occupancies | 551.44(D) | Recreational vehicles wired in accordance with 551.42(D) shall use a listed 50-ampere, 120/208-240-volt main feeder assembly. [551.44(D)](https://2023.antflix.net#551.44(D)) | https://2023.antflix.net#551.44(D) |
Chaptewr 5 Special Occupancies | 551.45(A) | A listed and appropriately rated panelboard or other equipment specifically listed for this purpose shall be used. The grounded conductor termination bar shall be insulated from the enclosure as provided in 551.54(C). An equipment grounding terminal bar shall be attached inside the enclosure of the panelboard. [551.45(A)](https://2023.antflix.net#551.45(A)) | https://2023.antflix.net#551.45(A) |
Chaptewr 5 Special Occupancies | 551.45(B) | The panelboard shall be installed in a readily accessible location with the RV in the setup mode. Working clearance for the panelboard with the RV in the setup mode shall be not less than 600 mm (24 in.) wide and 750 mm (30 in.) deep. Exception No. 1: Where the panelboard cover is exposed to the inside aisle space, one of the working clearance dimensions shall be permitted to be reduced to a minimum of 550 mm (22 in.). A panelboard is considered exposed where the panelboard cover is within 50 mm (2 in.) of the aisle's finished surface or not more than 25 mm (1 in.) from the backside of doors that enclose the space. Exception No. 2: Compartment doors used for access to a generator shall be permitted to be equipped with a locking system. [551.45(B)](https://2023.antflix.net#551.45(B)) | https://2023.antflix.net#551.45(B) |
Chaptewr 5 Special Occupancies | 551.45(C) | The panelboard shall be of the dead-front type and shall consist of one or more circuit breakers or Type S fuseholders. A main disconnecting means shall be provided where fuses are used or where more than two circuit breakers are employed. A main overcurrent protective device not exceeding the feeder assembly rating shall be provided where more than two branch circuits are employed. [551.45(C)](https://2023.antflix.net#551.45(C)) | https://2023.antflix.net#551.45(C) |
Chaptewr 5 Special Occupancies | 551.46(A) | The feeder assembly or assemblies shall be factory supplied or factory installed and be of one of the ty pes specified herein. [551.46(A)](https://2023.antflix.net#551.46(A)) | https://2023.antflix.net#551.46(A) |
Chaptewr 5 Special Occupancies | 551.46(A)(1) | Where a separable feeder assembly consisting of a cord with a female connector and molded attachment plug cap is provided, the vehicle shall be equipped with a permanently mounted, flanged surface inlet (male, recessed-type motor-base attachment plug) wired directly to the panelboard by an approved wiring method. The attachment plug cap shall be of a listed type. [551.46(A)(1)](https://2023.antflix.net#551.46(A)(1)) | https://2023.antflix.net#551.46(A)(1) |
Chaptewr 5 Special Occupancies | 551.46(A)(2) | Each feeder assembly shall be connected directly to the terminals of the panelboard or conductors within a junction box and provided with means to prevent strain from being transmitted to the terminals. The ampacity of the conductors between each junction box and the terminals of each panelboard shall be at least equal to the ampacity of the power-supply cord. The supply end of the assembly shall be equipped with an attachment plug of the type described in 551.46(C). Where the cord passes through the walls or floors, it shall be protected by means of conduit and bushings or equivalent. The cord assembly shall have permanent provisions for protection against corrosion and mechanical damage while the vehicle is in transit and while the cord assembly is being stored or removed for use. [551.46(A)(2)](https://2023.antflix.net#551.46(A)(2)) | https://2023.antflix.net#551.46(A)(2) |
Chaptewr 5 Special Occupancies | 551.46(B) | The cord exposed usable length shall be measured from the point of entrance to the recreational vehicle or the face of the flanged surface inlet (motor-base attachment plug) to the face of the attachment plug at the supply end. The cord exposed usable length, measured to the point of entry on the vehicle exterior, shall be a minimum of 7.5 m (25 ft) where the point of entrance is at the side of the vehicle or shall be a minimum 9.0 m (30 ft) where the point of entrance is at the rear of the vehicle. Where the cord entrance into the vehicle is more than 900 mm (3 ft) above the ground, the minimum cord lengths above shall be increased by the vertical distance of the cord entrance heights above 900 mm (3 ft). Informational Note: See 551.46(E) for location of point of entrance of a power-supply assembly on the recreational vehicle exterior. [551.46(B)](https://2023.antflix.net#551.46(B)) | https://2023.antflix.net#551.46(B) |
Chaptewr 5 Special Occupancies | 551.46(C)(1) | Recreational vehicles having only one 15-ampere branch circuit as permitted by 551.42(A) shall have an attachment plug that shall be 2-pole, 3-wire grounding type, rated 15 amperes, 125 volts, conforming to the configuration shown in Figure 551.46(C)(1). Informational Note: See ANSI/ NEMA WD 6-2016, Wiring Devices - Dimensional Specifications, Figure 5.15, for complete details of this configuration. [551.46(C)(1)](https://2023.antflix.net#551.46(C)(1)) | https://2023.antflix.net#551.46(C)(1) |
Chaptewr 5 Special Occupancies | 551.46(C)(2) | Recreational vehicles having only one 20-ampere branch circuit as permitted in 551.42(B) shall have an attachment plug that shall be 2-pole, 3-wire grounding type, rated 20 amperes, 125 volts, conforming to the configuration shown in Figure 551.46(C)(1). Informational Note: See ANSI/NEMA WD 6-2016, Wiring Devices - Dimensional Specifications, Figure 5.20, for complete details of this configuration. [551.46(C)(2)](https://2023.antflix.net#551.46(C)(2)) | https://2023.antflix.net#551.46(C)(2) |
Chaptewr 5 Special Occupancies | 551.46(C)(3) | Recreational vehicles wired in accordance with 551.42(C) shall have an attachment plug that shall be 2-pole, 3-wire grounding type, rated 30 amperes, 125 volts, conforming to the configuration shown in Figure 551.46(C)(1) intended for use with units rated at 30 amperes, 125 volts. Informational Note: See ANSI/NEMA WD 6-2016, Wiring Devices - Dimensional Specifications, Figure TT, for complete details of this configuration. [551.46(C)(3)](https://2023.antflix.net#551.46(C)(3)) | https://2023.antflix.net#551.46(C)(3) |
Chaptewr 5 Special Occupancies | 551.46(C)(4) | Recreational vehicles having a power-supply assembly rated 50 amperes as permitted by 551.42(D) shall have a 3-pole, 4-wire grounding-type attachment plug rated 50 amperes, 125/250 volts, conforming to the configuration shown in Figure 551.46(C)(1). Informational Note: See ANSI/NEMA WD 6-2016, Wiring Devices - Dimensional Specifications, Figure 14.50, for complete details of this configuration. [551.46(C)(4)](https://2023.antflix.net#551.46(C)(4)) | https://2023.antflix.net#551.46(C)(4) |
Chaptewr 5 Special Occupancies | 551.46(D) | Each recreational vehicle shall have a safety label with the signal word WARNING in minimum 6-mm (1/4-in. ) high letters and body text in minimum 3-mm (1/8-in.) high letters on a contrasting background. The safety label shall be affixed to the exterior skin, at or near the point of entrance of the power-supply cord(s), and shall read, using one of the following warnings, as appropriate: WARNINGTHIS CONNECTION IS FOR 110—125-VOLT AC,60 HZ, _____ AMPERE SUPPLY.DO NOT EXCEED CIRCUIT RATING.EXCEEDING THE CIRCUIT RATING CAN CAUSE AFIRE AND RESULT IN DEATH OR SERIOUS INJURY. or WARNINGTHIS CONNECTION IS FOR 208Y/120-VOLT120/240-VOLT AC, 3-POLE, 4-WIRE, 60 HZ, ________ AMPERESUPPLY. DO NOT EXCEED CIRCUIT RATING. EXCEEDING THE CIRCUIT RATING CAN CAUSE AFIRE AND RESULT IN DEATH OR SERIOUS INJURY. The correct ampere rating shall be marked in the blank space. [551.46(D)](https://2023.antflix.net#551.46(D)) | https://2023.antflix.net#551.46(D) |
Chaptewr 5 Special Occupancies | 551.46(E) | The point of entrance of a power-supply assembly shall be located within 4.5 m (15 ft) of the rear, on the left (road) side or at the rear, left of the longitudinal center of the vehicle, within 450 mm (18 in.) of the outside wall. Exception No. 1: A recreational vehicle equipped with only a listed flexible drain system or a side-vent drain system shall be permitted to have the electrical point of entrance located on either side, provided the drain(s) for the plumbing system is (are) located on the same side. Exception No. 2: A recreational vehicle shall be permitted to have the electrical point of entrance located more than 4.5 m (15 ft) from the rear. Where this occurs, the distance beyond the 4.5-m (15-ft) dimension shall be added to the cord's minimum length as specified in 551.46(B). Exception No. 3: Recreational vehicles designed for transporting livestock shall be permitted to have the electrical point of entrance located on either side or the front. FIGURE 551.46(C)(1) Configurations for Grounding-Type Receptacles and Attachment Plug Caps Used for Recreational Vehicle Supply Cords and Recreational Vehicle Lots. [551.46(E)](https://2023.antflix.net#551.46(E)) | https://2023.antflix.net#551.46(E) |
Chaptewr 5 Special Occupancies | 551.47(A) | Cables and raceways installed in accordance with Articles 320, 322, 330 through 340, 342 through 362, 386, and 388 shall be permitted in accordance with their applicable article, except as otherwise specified in this article. An equipment grounding means shall be provided in accordance with 250.118. [551.47(A)](https://2023.antflix.net#551.47(A)) | https://2023.antflix.net#551.47(A) |
Chaptewr 5 Special Occupancies | 551.47(B) | 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. All cut ends of conduit and tubing shall be reamed or otherwise finished to remove rough edges. [551.47(B)](https://2023.antflix.net#551.47(B)) | https://2023.antflix.net#551.47(B) |
Chaptewr 5 Special Occupancies | 551.47(C) | Nonmetallic boxes shall be acceptable only with nonmetallic-sheathed cable or nonmetallic raceways. [551.47(C)](https://2023.antflix.net#551.47(C)) | https://2023.antflix.net#551.47(C) |
Chaptewr 5 Special Occupancies | 551.47(D) | In walls and ceilings constructed of wood or other combustible material, boxes and fittings shall be flush with the finished surface or project therefrom. [551.47(D)](https://2023.antflix.net#551.47(D)) | https://2023.antflix.net#551.47(D) |
Chaptewr 5 Special Occupancies | 551.47(E) | Wall and ceiling boxes shall be mounted in accordance with 314.23. Exception No. 1: Snap-in-type boxes or boxes provided with special wall or ceiling brackets that securely fasten boxes in walls or ceilings shall be permitted. Exception No. 2: A wooden plate providing a 38-mm (11/2-in.) minimum width backing around the box and of a thickness of 13 mm (1/2 in.) or greater (actual) attached directly to the wall panel shall be considered, as approved means for mounting outlet boxes. [551.47(E)](https://2023.antflix.net#551.47(E)) | https://2023.antflix.net#551.47(E) |
Chaptewr 5 Special Occupancies | 551.47(F) | Raceways and cable sheaths shall be continuous between boxes and other enclosures. [551.47(F)](https://2023.antflix.net#551.47(F)) | https://2023.antflix.net#551.47(F) |
Chaptewr 5 Special Occupancies | 551.47(G) | Metal-clad, Type AC, or nonmetallic-sheathed cables and electrical nonmetallic tubing shall be permitted to pass through the centers of the wide side of 2 by 4 wood studs. However, they shall be protected where they pass through 2 by 2 wood studs or at other wood studs or frames where the cable or tubing would be less than 32 mm (11/4 in.) from the inside or outside surface. Steel plates on each side of the cable or tubing or a steel tube, with not less than 1.35 mm (0.053 in.) wall thickness, shall be installed to protect the cable or tubing. These plates or tubes shall be securely held in place. Where nonmetallic-sheathed cables pass through punched, cut, or drilled slots or holes in metal members, the cable shall be protected by bushings or grommets securely fastened in the opening prior to installation of the cable. [551.47(G)](https://2023.antflix.net#551.47(G)) | https://2023.antflix.net#551.47(G) |
Chaptewr 5 Special Occupancies | 551.47(H) | No bend shall have a radius of less than five times the cable diameter. [551.47(H)](https://2023.antflix.net#551.47(H)) | https://2023.antflix.net#551.47(H) |
Chaptewr 5 Special Occupancies | 551.47(I) | Where connected with cable connectors or clamps, cables shall be secured and supported within 300 mm (12 in.) of outlet boxes, panelboards, and splice boxes on appliances. Supports and securing shall be provided at intervals not exceeding 1.4 m (41/2 ft) at other places. [551.47(I)](https://2023.antflix.net#551.47(I)) | https://2023.antflix.net#551.47(I) |
Chaptewr 5 Special Occupancies | 551.47(J) | Nonmetallic-sheathed cables shall be secured and supported within 200 mm (8 in.) of a nonmetallic outlet box without cable clamps. Where wiring devices with integral enclosures are employed with a loop of extra cable to permit future replacement of the device, the cable loop shall be considered as an integral portion of the device. [551.47(J)](https://2023.antflix.net#551.47(J)) | https://2023.antflix.net#551.47(J) |
Chaptewr 5 Special Occupancies | 551.47(K) | Where subject to physical damage, exposed nonmetallic cable shall be protected by covering boards, guard strips, raceways, or other means. [551.47(K)](https://2023.antflix.net#551.47(K)) | https://2023.antflix.net#551.47(K) |
Chaptewr 5 Special Occupancies | 551.47(L) | Metal faceplates shall comply with 406.6(A). Nonmetallic faceplates shall comply with 406.6(C). [551.47(L)](https://2023.antflix.net#551.47(L)) | https://2023.antflix.net#551.47(L) |
Chaptewr 5 Special Occupancies | 551.47(M) | Metal faceplates shall be installed in compliance with 404.9(B) and 404.6(B). [551.47(M)](https://2023.antflix.net#551.47(M)) | https://2023.antflix.net#551.47(M) |
Chaptewr 5 Special Occupancies | 551.47(N) | Wiring shall be protected in accordance with the following: 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. [551.47(N)](https://2023.antflix.net#551.47(N)) | https://2023.antflix.net#551.47(N) |
Chaptewr 5 Special Occupancies | 551.47(O) | 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 recreational vehicles. [551.47(O)](https://2023.antflix.net#551.47(O)) | https://2023.antflix.net#551.47(O) |
Chaptewr 5 Special Occupancies | 551.47(P) | The method of connecting expandable units to the main body of the vehicle shall comply with 551.47 (P)(1) or (P)(2). [551.47(P)](https://2023.antflix.net#551.47(P)) | https://2023.antflix.net#551.47(P) |
Chaptewr 5 Special Occupancies | 551.47(P)(1) | Cord-and-plug connections shall comply with 551.47(P)(1)(a) through (P)(1)(d). That portion of a branch circuit that is installed in an expandable unit shall be permitted to be connected to the portion of the branch circuit in the main body of the vehicle by means of an attachment plug and cord listed for hard usage. The cord and its connections shall comply with Part I and Part II, as applicable, of Article 400 and shall be considered as a permitted use under 400.10. Where the attachment plug and cord are located within the vehicle's interior, use of plastic thermoset or elastomer parallel cord Type SPT-3, SP-3, or SPE shall be permitted.Where the receptacle provided for connection of the cord to the main circuit is located on the outside of the vehicle, it shall be protected with a ground-fault circuit interrupter for personnel and be listed for wet locations. A cord located on the outside of a vehicle shall be identified for outdoor use.Unless removable or stored within the vehicle interior, the cord assembly shall have permanent provisions for protection against corrosion and mechanical damage while the vehicle is in transit.The attachment plug and cord shall be installed so as not to permit exposed live attachment plug pins. [551.47(P)(1)](https://2023.antflix.net#551.47(P)(1)) | https://2023.antflix.net#551.47(P)(1) |
Chaptewr 5 Special Occupancies | 551.47(P)(2) | That portion of a branch circuit that is installed in an expandable unit shall be permitted to be connected to the portion of the branch circuit in the main body of the vehicle by means of flexible cord installed in accordance with 551.47(P)(2)(a) through (P)(2)(e) or other approved wiring method. The flexible cord shall be listed for hard usage and for use in wet locations.The flexible cord shall be permitted to be exposed on the underside of the vehicle.The flexible cord shall be permitted to pass through the interior of a wall or floor assembly or both a maximum concealed length of 600 mm (24 in.) before terminating at an outlet or junction box.Where concealed, the flexible cord shall be installed in nonflexible conduit or tubing that is continuous from the outlet or junction box inside the recreational vehicle to a weatherproof outlet box, junction box, or strain relief fitting listed for use in wet locations that is located on the underside of the recreational vehicle. The outer jacket of the flexible cord shall be continuous into the outlet or junction box.Where the flexible cord passes through the floor to an exposed area inside of the recreational vehicle, it shall be protected by means of conduit and bushings or equivalent.Where subject to physical damage, the flexible cord shall be protected with RMC, IMC, Schedule 80 PVC, reinforced thermosetting resin conduit (RTRC) listed for exposure to physical damage, or other approved means and shall extend at least 150 mm (6 in.) above the floor. A means shall be provided to secure the flexible cord where it enters the recreational vehicle. [551.47(P)(2)](https://2023.antflix.net#551.47(P)(2)) | https://2023.antflix.net#551.47(P)(2) |
Chaptewr 5 Special Occupancies | 551.47(Q) | Prewiring installed for the purpose of facilitating future air-conditioning installation shall comply with the applicable portions of this article and the following: An overcurrent protective device with a rating compatible with the circuit conductors shall be installed in the panelboard and wiring connections completed.The load end of the circuit shall terminate in a junction box with a blank cover or other listed enclosure. Where a junction box with a blank cover is used, the free ends of the conductors shall be adequately capped or taped.A safety label with the signal word WARNING in minimum 6-mm (1/4-in.) high letters and body text in minimum 3-mm (1/8-in.) high letters on a contrasting background shall be affixed on or adjacent to the junction box and shall read as follows:WARNINGAIR-CONDITIONING CIRCUIT.THIS CONNECTION IS FOR AIR CONDITIONERS RATED 110—125-VOLT AC, 60 HZ, ___ AMPERES MAXIMUM.DO NOT EXCEED CIRCUIT RATING.EXCEEDING THE CIRCUIT RATING MAYCAUSE A FIRE AND RESULT IN DEATHOR SERIOUS INJURY.An ampere rating, not to exceed 80 percent of the circuit rating, shall be legibly marked in the blank space.The circuit shall serve no other purpose. [551.47(Q)](https://2023.antflix.net#551.47(Q)) | https://2023.antflix.net#551.47(Q) |
Chaptewr 5 Special Occupancies | 551.47(R) | Prewiring installed for the purpose of facilitating future generator installation shall comply with the other applicable portions of this article and the following: Circuit conductors shall be appropriately sized in relation to the anticipated load as stated on the label required in 551.47(R)(4).Where junction boxes are utilized at either of the circuit originating or terminus points, free ends of the conductors shall be adequately capped or taped.Where devices such as receptacle outlet, transfer switch, and so forth, are installed, the installation shall be complete, including circuit conductor connections.A safety label with the signal word WARNING in minimum 6 mm (1/4 in.) high letters and body text in minimum 3 mm (1/8 in.) high letters on a contrasting background shall be affixed on the cover of each junction box or transfer switch containing incomplete circuitry and shall read, using one of the following warnings, as appropriate:WARNINGGENERATORONLY INSTALL A GENERATOR LISTED SPECIFICALLYFOR RV USE HAVING OVERCURRENTPROTECTION RATED 110—125-VOLT AC, 60 HZ, __________ AMPERES MAXIMUM.orWARNINGGENERATORONLY INSTALL A GENERATOR LISTED SPECIFICALLYFOR RV USE HAVING OVERCURRENTPROTECTION RATED 120-240-VOLT AC, 60 HZ, __________ AMPERES MAXIMUM.The correct ampere rating shall be legibly marked in the blank space. [551.47(R)](https://2023.antflix.net#551.47(R)) | https://2023.antflix.net#551.47(R) |
Chaptewr 5 Special Occupancies | 551.47(S) | Prewiring installed for the purpose of installing other appliances or devices shall comply with the applicable portions of this article and the following: An overcurrent protection device with a rating compatible with the circuit conductors shall be installed in the panelboard with wiring connections completed.The load end of the circuit shall terminate in a junction box with a blank cover or a device listed for the purpose. Where a junction box with blank cover is used, the free ends of the conductors shall be adequately capped or taped.A safety label with the signal word WARNING in minimum 6-mm (1/4-in.) high letters and body text in minimum 3-mm (1/8-in.) high letters on a contrasting background shall be affixed on or adjacent to the junction box or device listed for the purpose and shall read as follows:WARNINGTHIS CONNECTION IS FOR _________ RATED __________ VOLTAC, 60 HZ, ______ AMPERES MAXIMUM. DO NOTEXCEED CIRCUIT RATING.EXCEEDING THE CIRCUIT RATING MAYCAUSE A FIRE AND RESULT IN DEATH ORSERIOUS INJURY.An ampere rating not to exceed 80 percent of the circuit rating shall be legibly marked in the blank space. [551.47(S)](https://2023.antflix.net#551.47(S)) | https://2023.antflix.net#551.47(S) |
Chaptewr 5 Special Occupancies | 551.48 | The maximum number of conductors permitted in boxes shall be in accordance with 314.16. [551.48](https://2023.antflix.net#551.48) | https://2023.antflix.net#551.48 |
Chaptewr 5 Special Occupancies | 551.49 | The identification of grounded conductors shall be in accordance with 200.6. [551.49](https://2023.antflix.net#551.49) | https://2023.antflix.net#551.49 |
Chaptewr 5 Special Occupancies | 551.50 | Conductor splices and connections at terminals shall be in accordance with 110.14. [551.50](https://2023.antflix.net#551.50) | https://2023.antflix.net#551.50 |
Chaptewr 5 Special Occupancies | 551.51(A) | Switches shall be rated in accordance with 551.51(A)(1) and (A)(2). [551.51(A)](https://2023.antflix.net#551.51(A)) | https://2023.antflix.net#551.51(A) |
Chaptewr 5 Special Occupancies | 551.51(A)(1) | For lighting circuits, switches shall be rated not less than 10 amperes, 120—125 volts and in no case less than the connected load. [551.51(A)(1)](https://2023.antflix.net#551.51(A)(1)) | https://2023.antflix.net#551.51(A)(1) |
Chaptewr 5 Special Occupancies | 551.51(A)(2) | Switches for motors or other loads shall comply with 404.14. [551.51(A)(2)](https://2023.antflix.net#551.51(A)(2)) | https://2023.antflix.net#551.51(A)(2) |
Chaptewr 5 Special Occupancies | 551.51(B) | Switches shall not be installed within wet locations in tub or shower spaces unless installed as part of a listed tub or shower assembly. [551.51(B)](https://2023.antflix.net#551.51(B)) | https://2023.antflix.net#551.51(B) |
Chaptewr 5 Special Occupancies | 551.52 | All receptacle outlets shall be of the grounding type and installed in accordance with 406.4 and 210.21. [551.52](https://2023.antflix.net#551.52) | https://2023.antflix.net#551.52 |
Chaptewr 5 Special Occupancies | 551.53(A) | Any combustible wall or ceiling finish exposed between the edge of a canopy or pan of a luminaire or ceiling-suspended (paddle) fan and the outlet box shall be covered with noncombustible material. [551.53(A)](https://2023.antflix.net#551.53(A)) | https://2023.antflix.net#551.53(A) |
Chaptewr 5 Special Occupancies | 551.53(B) | If a luminaire is provided over a bathtub or in a shower stall, it shall be of the enclosed and gasketed type and listed for the type of installation, and it shall be ground-fault circuit-interrupter protected. [551.53(B)](https://2023.antflix.net#551.53(B)) | https://2023.antflix.net#551.53(B) |
Chaptewr 5 Special Occupancies | 551.53(C) | Outdoor luminaires and other equipment shall be listed for outdoor use. [551.53(C)](https://2023.antflix.net#551.53(C)) | https://2023.antflix.net#551.53(C) |
Chaptewr 5 Special Occupancies | 551.54 | (See also 551.56 on bonding of noncurrent-carrying metal parts.) [551.54](https://2023.antflix.net#551.54) | https://2023.antflix.net#551.54 |
Chaptewr 5 Special Occupancies | 551.54(A) | The equipment grounding conductor in the supply cord or feeder shall be connected to the equipment grounding bus or other approved equipment grounding means in the panelboard. [551.54(A)](https://2023.antflix.net#551.54(A)) | https://2023.antflix.net#551.54(A) |
Chaptewr 5 Special Occupancies | 551.54(B) | The panelboard shall have an equipment grounding bus with terminals for all equipment grounding conductors or other approved equipment grounding means. [551.54(B)](https://2023.antflix.net#551.54(B)) | https://2023.antflix.net#551.54(B) |
Chaptewr 5 Special Occupancies | 551.54(C) | The neutral conductor shall be insulated from the equipment grounding conductors and from equipment enclosures and other grounded parts. The neutral 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. Connection of electric ranges and electric clothes dryers utilizing a grounded conductor, if cord-connected, shall be made with 4-conductor cord and 3-pole, 4-wire grounding-type plug caps and receptacles. [551.54(C)](https://2023.antflix.net#551.54(C)) | https://2023.antflix.net#551.54(C) |
Chaptewr 5 Special Occupancies | 551.55(A) | In the electrical system, all exposed metal parts, enclosures, frames, luminaire canopies, and so forth, shall be effectively bonded to the grounding terminals or enclosure of the panelboard. [551.55(A)](https://2023.antflix.net#551.55(A)) | https://2023.antflix.net#551.55(A) |
Chaptewr 5 Special Occupancies | 551.55(B) | Bare wires, insulated wire with an outer finish that is green or green with one or more yellow stripes, shall be used for equipment grounding or bonding conductors only. [551.55(B)](https://2023.antflix.net#551.55(B)) | https://2023.antflix.net#551.55(B) |
Chaptewr 5 Special Occupancies | 551.55(C) | Grounding of electrical equipment shall be accomplished by one or more of the following methods: Connection of metal raceway, the sheath of Type MC and Type MI cable where the sheath is identified for grounding, or the armor of Type AC cable to metal enclosures.A connection between the one or more equipment grounding conductors and a metal enclosure by means of a grounding screw, which shall be used for no other purpose, or a listed grounding device.The equipment grounding conductor in nonmetallic-sheathed cable shall be permitted to be secured under a screw threaded into the luminaire canopy other than a mounting screw or cover screw, or attached to a listed grounding means (plate) in a nonmetallic outlet box for luminaire mounting. [Grounding means shall also be permitted for luminaire attachment screws.] [551.55(C)](https://2023.antflix.net#551.55(C)) | https://2023.antflix.net#551.55(C) |
Chaptewr 5 Special Occupancies | 551.55(D) | A connection between the one or more equipment grounding conductors brought into a nonmetallic outlet box shall be so arranged that a connection of the equipment grounding conductor can be made to any fitting or device in that box that requires grounding. [551.55(D)](https://2023.antflix.net#551.55(D)) | https://2023.antflix.net#551.55(D) |
Chaptewr 5 Special Occupancies | 551.55(E) | Where more than one equipment grounding or bonding conductor of a branch circuit enters a box, all such conductors shall be connected together using a method specified in 250.8, and the arrangement shall be such that the disconnection or removal of a receptacle, luminaire, or other device fed from the box will not interfere with or interrupt the grounding continuity. [551.55(E)](https://2023.antflix.net#551.55(E)) | https://2023.antflix.net#551.55(E) |
Chaptewr 5 Special Occupancies | 551.55(F) | Cord-connected appliances, such as washing machines, clothes dryers, refrigerators, and the electrical system of gas ranges, and so forth, shall be grounded by means of an approved cord with equipment grounding conductor and grounding-type attachment plug. [551.55(F)](https://2023.antflix.net#551.55(F)) | https://2023.antflix.net#551.55(F) |
Chaptewr 5 Special Occupancies | 551.56(A) | 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. [551.56(A)](https://2023.antflix.net#551.56(A)) | https://2023.antflix.net#551.56(A) |
Chaptewr 5 Special Occupancies | 551.56(B) | A bonding conductor shall be connected between any panelboard and an accessible terminal on the chassis. Bonding terminations shall be suitable for the environment in which the conductors and terminations are installed. Exception: Any recreational vehicle that employs a unitized metal chassis-frame construction to which the panelboard is securely fastened with a bolt(s) and nut(s) or by welding or riveting shall be considered to be bonded. [551.56(B)](https://2023.antflix.net#551.56(B)) | https://2023.antflix.net#551.56(B) |
Chaptewr 5 Special Occupancies | 551.56(C) | 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 equal. [551.56(C)](https://2023.antflix.net#551.56(C)) | https://2023.antflix.net#551.56(C) |
Chaptewr 5 Special Occupancies | 551.56(D) | The metal roof and exterior covering shall be considered bonded where both of the following conditions apply: The metal panels overlap one another and are securely attached to the wood or metal frame parts by metal fasteners.The lower panel of the metal exterior covering is secured by metal fasteners at each cross member of the chassis, or the lower panel is connected to the chassis by a metal strap. [551.56(D)](https://2023.antflix.net#551.56(D)) | https://2023.antflix.net#551.56(D) |
Chaptewr 5 Special Occupancies | 551.56(E) | The gas, water, and waste pipes shall be considered grounded if they are bonded to the chassis. [551.56(E)](https://2023.antflix.net#551.56(E)) | https://2023.antflix.net#551.56(E) |
Chaptewr 5 Special Occupancies | 551.56(F) | Furnace and metal circulating air ducts shall be bonded. [551.56(F)](https://2023.antflix.net#551.56(F)) | https://2023.antflix.net#551.56(F) |
Chaptewr 5 Special Occupancies | 551.57 | Every appliance shall be accessible for inspection, service, repair, and replacement without removal of permanent construction. Means shall be provided to securely fasten appliances in place when the recreational vehicle is in transit. [551.57](https://2023.antflix.net#551.57) | https://2023.antflix.net#551.57 |
Chaptewr 5 Special Occupancies | 551.60 | Each recreational vehicle designed with a 120-volt or a 120/240-volt electrical system shall withstand the applied voltage without electrical breakdown of a 1-minute, 900-volt ac or 1280-volt dc dielectric strength test, or a 1-second, 1080-volt ac or 1530-volt dc dielectric strength test, with all switches closed, between ungrounded and grounded conductors and the recreational vehicle ground. During the test, all switches and other controls shall be in the "on" position. Fixtures, including luminaires and permanently installed appliances, shall not be required to withstand this test. The test shall be performed after branch circuits are complete prior to energizing the system and again after all outer coverings and cabinetry have been secured. The dielectric test shall be performed in accordance with the test equipment manufacturer's written instructions. Each recreational vehicle shall be subjected to all of the following:A continuity test to ensure that all metal parts are properly bondedOperational tests to demonstrate that all equipment is properly connected and in working orderPolarity checks to determine that connections have been properly madeGFCI test to demonstrate that the ground fault protection device(s) installed on the recreational vehicle are operating properly [551.60](https://2023.antflix.net#551.60) | https://2023.antflix.net#551.60 |
Chaptewr 5 Special Occupancies | 551.71(A) | Every recreational vehicle site with electrical supply shall be equipped with recreational vehicle site supply equipment with at least one 20-ampere, 125-volt weather-resistant receptacle. This receptacle, when used in recreational vehicle site electrical equipment, shall not be required to be tamper-resistant in accordance with 406.12. [551.71(A)](https://2023.antflix.net#551.71(A)) | https://2023.antflix.net#551.71(A) |
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