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12 Low-Voltage Output Connections and Wiring
12.1 General
12.1.1 A converter shall have one of the following provisions for output connections:
a) A wiring compartment and terminals complying with the requirements in 12.1.2 – 12.1.5,
b) A receptacle or attachment plug complying with the requirements in 12.1.6 – 12.1.12,
c) Unenclosed individual leads complying with the requirements in 12.1.13 – 12.1.15.
12.1.2 An opening in a wiring compartment for output connections shall be an opening or knockout for a
standard trade size conduit, or an opening of unspecified size provided with an acceptable insulating
bushing.
12.1.3 Leads provided in the wiring compartment shall be provided with strain relief so that stress on the
leads will not be transmitted to terminals, splices, or interior wiring.
12.1.4 Terminal assemblies provided for the connection of low-voltage external circuits shall comply with
the requirements for line-voltage circuits.
12.1.5 A field-wiring terminal assembly provided as part of a transfer switch or relay shall comply with the
requirements in 11.1.2.1 – 11.1.2.10, and shall be of such size as to accommodate a load based on 1.25
times the output current rating of the converter. A lead provided for this purpose shall be capable of
carrying the same current without exceeding its temperature rating.
12.1.6 A receptacle or attachment plug for output connection shall not accept a mating part having a
standard configuration complying with the Standard for Attachment Plugs and Receptacles, UL 498.
12.1.7 An attachment plug shall be a locking type to reduce the likelihood of loosening under conditions
of transit or shall be investigated for secureness.
12.1.8 An attachment plug or a receptacle other than as mentioned in 12.1.9 shall be secured to the
enclosure or to another rigid part of the converter.
12.1.9 Both mating parts of a battery-type attachment plug or a receptacle provided for connection of
wiring to a storage battery shall have recessed contacts. The receptacle shall be mounted to a rigid part
of the converter unless it is intended to be rigidly attached to the recreational vehicle, in which case the
attachment plug shall terminate in an output cord not longer than 3 feet (914 mm). The cord shall comply
with the requirements for strain-relief specified in Section 42, Strain Relief Test.
12.1.10 An attachment-plug receptacle shall have recessed contacts.
12.1.11 If a matching attachment plug or receptacle is used on a converter, the converter shall be marked
in accordance with 57.19.
12.1.12 Unless a receptacle and its attachment plug have been investigated for current interruption, the
converter shall be marked in accordance with 57.20.
DECEMBER 14, 1993 UL 458 25
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