UL COPYRIGHTED MATERIAL –
NOT AUTHORIZED FOR FURTHER REPRODUCTION OR
DISTRIBUTION WITHOUT PERMISSION FROM UL
MARKING
56 Details
56.1 Unless otherwise stated, all markings are required to be permanent, that is, either by being molded,
die-stamped, paint-stenciled; stamped or etched metal that is permanently secured; or indelibly stamped
on a pressure-sensitive label secured by adhesive that, upon investigation is found to comply with the
applicable requirements for indoor use labels in the Standard for Marking and Labeling Systems, UL 969.
56.1 effective April 13, 1993
56.2 A marking as required by 56.1 need not be located on the outside of an enclosure, provided it is
readily visible by opening a door or removing a cover after installation. A marking that is not visible unless
a cover is removed is acceptable only if the field wiring will not be disturbed by removing the cover and if
the marking is visible at the time it is needed.
56.3 A required marking on a flush-mounted panel shall be visible with the panel mounted on the
enclosed base, except that required wiring and installation instructions may be visible upon removal of the
panel from the enclosure base.
57 Content
57.1 A converter or inverter shall be marked with:
a) The manufacturer’s name, trade name, or trademark – hereinafter referred to as the
manufacturer’s name;
b) A distinctive catalog number or the equivalent;
c) The input voltage, frequency, and amperes or watts;
d) The words ″Provided with integral protection against overloads;″
e) The output voltage and current in amperes; and
f) The date or other dating period of manufacture not exceeding any three consecutive months.
Exception No. 1: The manufacturer’s identification may be in a traceable code if the converter or inverter
is identified by a brand or trademark owned by a private labeler.
Exception No. 2: The date of manufacture may be abbreviated; or may be in a nationally accepted
conventional code, or in a code affirmed by the manufacturer if the code:
a) Does not repeat in less than 20 years; and
b) Does not require reference to the production records of the manufacturer to determine when
the product was manufactured.
57.1 effective April 13, 1993
DECEMBER 14, 1993UL 45874
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