UL COPYRIGHTED MATERIAL –
NOT AUTHORIZED FOR FURTHER REPRODUCTION OR
DISTRIBUTION WITHOUT PERMISSION FROM UL
2.11 FLUSH-WALL-MOUNTED UNITS – Units that are intended to be recessed in a wall.
2.11 effective April 13, 1993
2.12 LIMITED-ENERGY CIRCUIT – A circuit having a voltage not exceeding 1000 volts and the energy
limited to 100 volt-amperes by a secondary winding of a transformer, or a fixed impedance.
2.12 effective April 13, 1993
2.13 LIVE PART – Denotes metal or conductive parts that, during intended use, have a potential
difference with respect to ground or any other conductive part.
2.13 effective April 13, 1993
2.14 LOW-VOLTAGE, LIMITED ENERGY CIRCUIT – A circuit involving an alternating voltage of not
more than 30 volts rms (42.4 volts peak) or a direct voltage of not more than 60 volts and supplied by:
a) An inherently limiting Class 2 transformer;
b) A non-inherently limiting Class 2 transformer and an overcurrent protective device that is:
1) Not of the automatic reclosing type;
2) Trip-free from the reclosing mechanism; and
3) Not readily interchangeable with a device of a different rating;
c) A combination of an isolated transformer secondary winding and a fixed impedance that
complies with all the performance requirements for an energy-limiting Class 2 transformer or
power source;
d) A dry-cell battery that is isolated from the primary circuit and having output characteristics no
greater than those of an energy-limiting Class 2 transformer or power source; or
e) A combination of a rechargeable battery and a fixed impedance that complies with all of the
performance requirements for an energy-limiting Class 2 transformer or power source.
2.14 effective April 13, 1993
2.15 PORTABLE POWER INVERTER – A power inverter that has no provisions for permanent
mounting or wiring, and can be easily carried or conveyed by hand.
2.15 revised October 15, 2004
2.16 POWER-CONVERTER OR POWER-INVERTER SYSTEM – An integral combination of a
converter or inverter, power-supply assembly, branch-circuit breakers, grounding bar, marking, and the
like, that are necessary for a complete installation.
2.16 effective April 13, 1993
2.17 POWER SUPPLY ASSEMBLY – Conductors, including grounding conductors insulated from each
other, connectors, attachment plugs, and all other fittings, grommets, or devices installed for the
purpose of delivering energy from a source of supply to a power-converter or inverter system of a land
vehicle or marine craft.
2.17 effective April 13, 1993
OCTOBER 15, 2004 UL 458 9
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