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2.27 SAFETY CIRCUIT – Any primary or secondary circuit that is relied upon to reduce the risk of fire,
electric shock, injury to persons, or electrical energy – high current levels. For example, in some
applications, an interlock circuit is considered to be a safety circuit.
2.27 effective April 13, 1993
2.28 SECONDARY CIRCUIT – A circuit conductively connected to the secondary winding of an
isolating power supply transformer.
2.28 effective April 13, 1993
2.29 SERVICE PERSONNEL – Trained persons having familiarity with the construction and operation
of the equipment, and the risks involved, who may periodically open an appliance to repair or maintain
electrical or mechanical components.
2.29 effective April 13, 1993
2.30 STAND ALONE UNITS – Units that are intended to be permanently mounted in place but not
recessed in the wall.
2.30 effective April 13, 1993
2.31 STATIONARY UNIT – Cord- and plug-connected units that are not fixed and are not movable. A
stationary unit may have provision for attachment in accordance with this standard.
2.31 effective April 13, 1993
2.32 POWER SUPPLY CORD – A separable cord set or a length of flexible cord or cable, with one end
connected to the primary-circuit wiring of the unit and the other end connected to the attachment plug
for connection to branch circuit power.
2.32 effective April 13, 1993
2.33 TOOL – A screwdriver, coin, key, or any other object that may be used to operate a screw latch,
or similar fastening means.
2.33 effective April 13, 1993
2.34 TRIP – Denotes automatic interruption of the electric circuit to the load.
2.34 effective April 13, 1993
2.35 USER SERVICING – Any form of servicing that can be performed by personnel other than those
who are trained to maintain the unit. Some examples of user servicing are:
a) The installation of accessories by means of attachment plugs and receptacles, or by means
of separable connectors.
b) The replacement of lamps and fuses, or the resetting of circuit breakers located in a user
access area unless they are marked to indicate replacement or resetting by qualified personnel
only.
c) The making of routine operating adjustments necessary to adapt the unit for different
intended functions.
d) Routine cleaning.
2.35 effective April 13, 1993
OCTOBER 15, 2004 UL 458 11
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