551 – Recreational Vehicles and Recreational Vehicle Parks

551.40(D) – Reverse Polarity Device in Recreational Vehicles

Change at a Glance:

New requirements added to require a reverse polarity indicating device that provides a continuous visible or audible signal to be installed in an RV in accordance with the installation instructions.

551.40 120-Volt or 120/240-Volt, Nominal, Systems. (Recreational Vehicles)

(A) General Requirements. (see NEC for complete Code text)

(B) Materials and Equipment. (see NEC for complete Code text)

(C) Ground-Fault Circuit-Interrupter Protection. (see NEC for complete Code text)

(D) Reverse Polarity Device. A reverse polarity indicating device that provides a continuous visible or audible signal shall be installed in the recreational vehicle in accordance with the installation instructions and shall respond to the reversal of the ungrounded and the grounded conductors in the 120-volt ac system.

551.71(F) – GFCI Protection for Supply Receptacles for Recreational Vehicle Parks

Change at a Glance:

Revision eliminates GFCI protection for receptacles rated above 125-volt, single-phase, 20-ampere (30- and 50-ampere receptacles for RV site equipment).

551.71 Type Receptacles Provided. (Recreational Vehicle Parks)

(F) GFCI Protection.
(1) All 125-volt, single-phase, 15- and 20-ampere receptacles shall have listed ground-fault circuit-interrupter protection for personnel. The GFCI devices used in RV site electrical equipment shall not be required to be weather or tamper resistant in accordance with 406.9 and 406.12.
Informational Note: The percentage of 50 ampere sites required by 551.71 could be inadequate for seasonal recreational vehicle sites serving a higher percentage of recreational vehicles with 50 ampere electrical systems. In that type of recreational vehicle park, the percentage of 50 ampere sites could approach 100 percent.
(2) Thirty- and 50-ampere receptacles used in recreational vehicle site equipment shall not be required to meet the requirements of 210.8(B).