43
25-35 42
36 plus 41
suits in a permissible demand of 1620 volt-amperes per site or a total of 32,400 volt-amperes for 20 sites.
FPN: These demand factors may be inadequate in areas of extreme hot or cold temperature with loaded circuits for heating or air conditioning.

(D) Feeder-Circuit Capacity. Recreational vehicle site feeder-circuit conductors shall have an ampacity not less than the loads supplied and shall be rated not less than 30 amperes. The neutral conductors shall have an ampacity not less than the ungrounded conductors.

FPN: Due to the long circuit lengths typical in most recreational vehicle parks, feeder conductor sizes found in the ampacity tables of Article 310 may be inadequate to maintain the voltage regulation suggested in the fine print note to 210.19. Total circuit voltage drop is a sum of the voltage drops of each serial circuit segment, where the load for each segment is calculated using the load that segment sees and the demand factors of 551.73(A).
Loads for other amenities such as, but not limited to, service buildings, recreational buildings, and swimming pools shall be calculated separately and then be added to the value calculated for the
recreational vehicle sites where they are all supplied by a common service.

551.74 Overcurrent Protection. Overcurrent protection shall be provided in accordance with Article 240.

551.75 Grounding. All electrical equipment and installations in recreational vehicle parks shall be grounded as required by Article 250.

551.76 Grounding — Recreational Vehicle Site Supply

Equipment.

(A) Exposed Non-Current-Carrying Metal Parts. Ex-

posed non-current-carrying metal parts of fixed
equipment, metal boxes, cabinets, and fittings that are
not electrically connected to grounded equipment
shall be grounded by an equipment grounding
conductor run with the circuit conductors from the
service equipment or from the transformer of a
secondary distribution system. Equipment grounding
conductors shall be sized in accordance with 250.122
and shall be permitted to be spliced by listed means.
The arrangement of equipment grounding connections shall be such that the disconnection or removal of a receptacle or other device will not interfere with, or interrupt, the grounding continuity.

(B) Secondary Distribution System. Each secondary distribution system shall be grounded at the transformer.

(C) Grounded Conductor Not to Be Used as an Equipment Ground. The grounded conductor shall not be used as an equipment grounding conductor for recreational vehicles or equipment within the recreational vehicle park.

(D) No Connection on the Load Side. No connection to a grounding electrode shall be made to the grounded conductor on the load side of the service disconnecting means except as covered in 250.30(A) for separately derived systems, and 250.32(B) Exception for separate buildings.

551.77 Recreational Vehicle Site Supply Equipment. (A) Location. Where provided on back-in sites, the

recreational vehicle site electrical supply equipment
shall be located on the left (road) side of the parked
vehicle, on a line that is 1.5 m to 2.1 m (5 ft to 7 ft)
from the left edge (driver's side of the parked RV) of
the stand and shall be located at any point on this line
from the rear