more than 150 percent of the rating of a single appliance rated 13.3 amperes or more and supplied by an individual branch circuit, but

(3) Not more than the overcurrent protection size marked on an air conditioner or other motor- operated appliances

(B) Protection for Smaller Conductors. 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.

(C) Fifteen-Ampere Receptacle Considered Protected by 20 Amperes. If more than one receptacle or load is on a branch circuit, a 15-ampere receptacle shall be permitted to be protected by a 20- ampere fuse or circuit breaker.

551.44 Power-Supply Assembly. Each recreational ve hicle shall have only one of the main power-supply assemblies covered in 551.44(A) through (D).

(A) Fifteen-Ampere Main Power-Supply

Assembly.

Recreational vehicles wired in accordance with
551.42(A) shall use a listed 15-ampere or larger main
power-supply assembly.

(B) Twenty-Ampere Main Power-Supply

Assembly.

Recreational vehicles wired in accordance with
551.42(B) shall use a listed 20-ampere or larger main
power-supply assembly.

(C) Thirty-Ampere Main Power-Supply Assembly.

Recreational vehicles wired in accordance with
551.42(C) shall use a listed 30-ampere or larger main
power-supply assembly.

(D) Fifty-Ampere Power-Supply Assembly.

Recreational vehicles wired in accordance with
551.42(D) shall use a listed 50-ampere, 120/208-240-
volt main power-supply assembly.

551.45 Distribution Panelboard.

(A) Listed and Appropriately Rated. A listed and appropriately rated distribution 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.

(B) Location. The distribution panelboard shall be in- stalled 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.

Exception No. 2: Compartment doors used for access to a generator shall be permitted to be equipped with a locking system.

(C) Dead-Front Type. The distribution 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 over current protective device not exceeding the power-supply assembly rating shall be provided where more than two branch circuits are employed.

551.46 Means for Connecting to Power Supply.

(A) Assembly. The power-supply assembly or assemblies shall be factory supplied or factory installed and be of one of the types specified herein.

(1) Separable. Where a separable power-supply assembly consisting