551-Recreational Vehicles and Recreational Vehicle Parks: Page 4 of 19

from vibration and road shock.

(D) Ventilation of Generator Compartments. Compartments accommodating internal-combustion- driven generator units shall be provided with ventilation in accordance with instructions provided by the manufacturer of the generator unit.

FPN: For generator compartment construction requirements, see NFPA 1192-2005, Standard on Recreational Vehicles.

(E) Supply Conductors. 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:

(1) Panelboard

(2) Junction box with a blank cover (3) Junction box with a receptacle (4) Enclosed transfer switch

(5) Receptacle assembly listed in conjunction with the generator

The panelboard or junction box with a receptacle shall be installed within the vehicle's interior and within 450 mm (18 in.) of the compartment wall but not inside the compartment. If the generator is below the floor level and not in a compartment, the panelboard or junction box with receptacle shall be installed within the vehicle interior within 450 mm (18 in.) of the point of entry into the vehicle. A junction box with a blank cover shall be mounted on the compartment wall and shall be permitted inside or outside the compartment. A receptacle assembly listed in conjunction with the generator shall be mounted in
accordance with its listing. If the generator is below floor level and not in a compartment, the junction box with blank cover shall be mounted either to any part of the generator supporting structure (but not to the generator) or to the vehicle floor within 450 mm (18 in.) of any point directly above the generator on either the inside or outside of the floor surface. Overcurrent protection in accordance with 240.4 shall be provided for supply conductors as an integral part of a listed generator or shall be located within 450 mm (18 in.) of their point of entry into the vehicle.

551.31 Multiple Supply Source.

(A) Multiple Supply Sources. 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.

(B) Multiple Supply Sources Capacity. The multiple supply sources shall not be required to be of the same capacity.

(C) Alternate Power Sources Exceeding 30 Amperes. 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.

(D) Power-Supply Assembly Not Less Than 30 Am peres. The external power-supply assembly shall be per mitted 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 power-supply as sembly.

551.32 Other Sources. Other sources of ac power, such as inverters, motor generators, or

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551-Recreational Vehicles and Recreational Vehicle Parks: Page 4 of 19

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(D) Ventilation of Generator Compartments. Compartments accommodating internal-combustion- driven generator units shall be provided with ventilation in accordance with instructions provided by the manufacturer of the generator unit.

(E) Supply Conductors. 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:

551.31 Multiple Supply Source.

(D) Power-Supply Assembly Not Less Than 30 Am peres. The external power-supply assembly shall be per mitted 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 power-supply as sembly.

551-Recreational Vehicles and Recreational Vehicle Parks: Page 4 of 19

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(D) Ventilation of Generator Compartments. Compartments accommodating internal-combustion- driven generator units shall be provided with ventilation in accordance with instructions provided by the manufacturer of the generator unit.

(E) Supply Conductors. 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:

551.31 Multiple Supply Source.

(D) Power-Supply Assembly Not Less Than 30 Am peres. The external power-supply assembly shall be per mitted 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 power-supply as sembly.

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