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 distribution panelboard by an approved wiring method. The attachment plug cap shall be of a listed type.

(2) Permanently Connected. Each power-supply assembly shall be connected directly to the terminals of the distribution 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 distribution 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.

(B) Cord. 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).

FPN: See-551.46(E).

(C) Attachment Plugs.

(1) Units with One 15-Ampere Branch Circuit. Recre ational 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) .
FPN: Complete details of this configuration can be found in ANSI/NEMA WD 6-2002, National Electrical Manufacturers Association's Standard for Dimensions of Attachment Plugs and Receptacle, Figure 5.15.

(2) Units with One 20-Ampere Branch Circuit. Recre ational 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,

Receptacles Caps

125-V, 2 -A, 2-pole, 3-wire,

[e.g., 0.13 mm (0.005 in.) thick plastic laminate] that reads, as appropriate, either

<.. image removed ..> © grounding type

THIS CONNECTION IS FOR

10-125-VOLT AC,

20-A, 125-V, 2- pole, 3-wire, grounding

125-V, 15-A, 2-pole, 3-wire,

grounding type or

60 HZ,

AMPERE SUPPLY.

THIS CONNECTION IS FOR 208Y/120-VOLT

or 120/240-VOLT AC, 3-POLE, 4-WIRE,

30-A, 125-V, 2-pole, 3-wire, grounding type

<.. image removed ..>

50-A, 125/250-V, 3-pole, 4-wire, grounding type

60 HZ,AMPERE SUPPLY.

The correct ampere rating shall be marked