UL COPYRIGHTED MATERIAL –
NOT AUTHORIZED FOR FURTHER REPRODUCTION OR
DISTRIBUTION WITHOUT PERMISSION FROM UL
specific requirements or provisions of this standard shall not be judged to comply with this standard.
Where appropriate, revision of requirements shall be proposed and adopted in conformance with the
methods employed for development, revision, and implementation of this standard.
1.9 revised September 11, 1998
2 Glossary
2.1 For the purpose of this standard the following definitions apply.
2.2 ACCESSIBLE PART – A part located so that it can be contacted by a person, either directly or by
means of a probe or tool during user servicing, or that is not recessed the required distance behind an
opening.
2.2 effective April 13, 1993
2.3 BARRIER – A partition for the insulation or isolation of electric circuits, for the isolation of electric
arcs, or for isolation of moving parts or hot surfaces. In this respect, a barrier may serve as a portion of
an enclosure or as a functional part.
2.3 effective April 13, 1993
2.4 BRANCH CIRCUIT – That portion of the wiring system beyond the final overcurrent protecting
device on the power-distribution panel protecting the circuit to the output.
2.4 effective April 13, 1993
2.5 CLASS 2 TRANSFORMER – A step-down, isolation type transformer having a secondary voltage of
not more than 30 volts rms (42.4 peak) under any condition of loading including open circuit and
complying with the applicable requirements in the Standard for Class 2 and Class 3 Transformers, UL
1585.
2.5 effective April 13, 1993
2.6 CONTROL CIRCUIT – A circuit that carries electric signals directing the performance of a controller
that, in turn, governs power delivered to a motor or other load in the equipment. A control circuit does
not carry main power current.
2.6 effective April 13, 1993
2.7 ENCLOSURE – That portion of a unit that reduces the accessibility and unintentional contact of a
part that may involve a risk of fire, electric shock or injury to persons, or reduces the risk of propagation
of flame, sparks, and molten metal initiated by an electrical disturbance occurring within.
2.7 effective April 13, 1993
2.8 FIELD-WIRING LEAD – Any lead to which a supply, load or other wire is intended to be connected
by an installer.
2.8 effective April 13, 1993
2.9 FIELD-WIRING TERMINAL – Any terminal to which a supply or other wire is intended to be
connected by an installer in the field is a field-wiring terminal unless the wire is provided as part of the
product and a pressure terminal, connector, soldering lug, soldered loop, crimped eyelet, or other
means for making the connection is factory-assembled to the wire.
2.9 effective April 13, 1993
2.10 FIXED UNIT – A unit that is intended to be permanently connected electrically.
2.10 effective April 13, 1993
OCTOBER 15, 2004UL 4588
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