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NOT AUTHORIZED FOR FURTHER REPRODUCTION OR
DISTRIBUTION WITHOUT PERMISSION FROM UL
57.2 Deleted October 15, 2004
57.3 Polarity identification shall be provided for output connections. The polarity is to be identified by:
a) The words ″battery positive,″″converter positive,″ and ″negative;″
b) The words ″battery″ and ″converter″ followed by the signs ″+″ for positive and ″−″ for
negative;
c) Color coding of red for battery positive, blue for converter positive, and white for negative; or
d) The abbreviations ″Pos″ and ″Neg″ with the symbols ″+″ and ″−.″
57.3 revised October 15, 2004
57.4 With reference to the requirements in 57.3, the words ″battery,″″converter,″″positive,″ and
″negative″ may be abbreviated ″Batt.,″″Conv.,″″Pos.″ and ″Neg.,″ respectively.
57.5 A converter shall be marked to indicate the branch-circuit protection provided for each
secondary-circuit-output connection – terminals, pigtail leads, plug and receptacle combinations, and the
like.
57.6 If a manufacturer produces or assembles a converter or inverter at more than one factory, each unit
shall have a permanent, distinctive marking – which may be in code – by which it may be identified as the
product of a particular factory.
57.6 revised October 15, 2004
57.7 If a converter incorporates an automatic means to change from direct-current converter power to
direct-current battery power, the automatic function shall be described in the manufacturer’s instructions.
57.8 If a transfer switch is provided to change from direct-current converter power to direct-current battery
power, the switch position shall be permanently marked as specified in paragraph 57.3.
57.9 A transfer switch or relay provided with a terminal or lead for a battery connection shall be marked
to indicate the current and voltage rating and the maximum size conductor that can be connected.
57.10 A converter employing devices such as switches, relays, or the like, that tend to produce arcs or
sparks shall be marked, ″WARNING – This equipment employs components that tend to produce arcs or
sparks – To prevent fire or explosion, do not install in compartments containing batteries or flammable
materials.″
57.11 A cautionary warning, or danger marking shall be permanent and shall be located on a part that
requires a tool for removal.
57.12 A cautionary marking to instruct the operator shall be visible and legible to the operator during
normal operation of the converter.
OCTOBER 15, 2004 UL 458 74A
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