UL 231

Please note: All interim revisions for this edition available at time of your purchase will be included.

Scope
1.1 These requirements cover power outlets, with or without integral mounting posts or pedestals, and power outlet fittings for use in accordance with the National Electrical Code, NFPA 70.

1.2 A power outlet covered by these requirements, although not restricted to such use, is intended for use:
a) At outdoor locations such as on farms, at building sites, and the like, where power is required to operate portable, mobile, or temporarily installed equipment,
b) To supply power to a mobile home or a recreational vehicle, and
c) To supply shore power to boats.

1.3 A power outlet may contain:
a) Attachment plug receptacles,
b) Circuit breakers,
c) Fuseholders,
d) Fused switches and facilities for watt-hour meters, and
e) Provisions for field installed circuit breakers or switches and fuses.

1.4 Power outlet fittings covered by these requirements are intended for factory or field assembly into or in conjunction with power outlets designed for such assembly. Fittings may be panels or combination units incorporating receptacles, disconnecting means, overcurrent protection or other devices that have been determined to be equivalent. A separable mounting post or pedestal to which power outlets are to be mounted is also a fitting.

1.5 In addition to or instead of mounting to a post or pedestal fitting as mentioned in 1.4, a power outlet may be constructed for mounting on and connection to a mounting post or pedestal also designed to be used with other types of distribution equipment.

1.6 Some power outlets may have special features and markings to indicate their acceptability for use as service equipment.

1.7 A power outlet with a mounting post is intended for mounting in concrete. A power outlet with a mounting pedestal is intended for mounting on a concrete slab. Unless marked otherwise, a mounting post or pedestal fitting is not intended to serve as the sole support of a mast for overhead wiring.