UL 153:2002 pdf download Portable Electric L .uminaires
2.18 INTERLOCK SWITCH – A switch that de-energizes the lamps when the portable luminaire isopened or when the lamp is replaced.
2.19 ISOLATED SECONDARY CIRCUIT – A circuit derived from an isolated secondary winding of atransformer and that has no direct connection back to the line-connected circuit (other than throughgrounding means). A secondary circuit that has a direct connection back to the line-connected circuit isdetermined to be part of the line-connected circuit.
2.20 LAMP – The device, commonly called a “light bulb or “bulb” intended to be inserted into alampholder (“socket”) to produce light.
2.21 LAMP CONTAINMENT BARRIER – Any part of a portable luminaire that encloses the lamp.
2.22 LIGHTING ASSEMBLY，NTERCHANGEABLE – An assembly consisting of a lighting unit and anadapter. One or more lighting assemblies is used with a base to make up the portable luminaire forinterchangeable lighting assemblies.
2.23 LIGHTING ASSEMBLYTRACK-STYLE – An assembly consisting of a lighting unit and anadapter. One or more lighting assemblies is used with a track to make up the track-style type unit.
2.24 LIGHTING UNIT，INTERCHANGEABLE- An assembly that includes a lamp enclosure or lampcompartment and any components and parts required for connecting the lamp compartment orenclosure to the adapter for interchangeable lighting assemblies.
2.25 LIGHTING UNIT, TRACK-STYLE – An assembly that includes a lamp enclosure or lampcompartment and any components and parts required for connecting the lamp compartment to theadapter for the track-style type units.
2.26 LINE OF SIGHT – A straight, unbroken, unobstructed, direct line between the eye and an object(for example，the lamp).
2.27 LIVE PART – A metal or other conductive part that has a potential diference during operation withrespect to ground or any other conductive part.
2.28 LOW-VOLTAGE CIRCUIT- A circuit involving a potential of not more than 30 volts alternatingcurrent (42.4 peak) open circuit.
2.29 NORMAL MAINTENANCE AND USE – The cleaning, adjusting, moving, maintaining, and using ofthe portable luminaire. Includes items such as:
a) Replacing a lamp， starter or fuse;
b) Adjusting an illumination level; and
c) Removal or cleaning of all parts not secured by use of tools.
2.30 ORDINARY TOOL – A tool, such as a flat-blade or cross-head screwdriver, a nut driver, or pliers.
2.31 POLYMERIC MATERIAL – A material made of a chemical compound or mixture of compoundsformed by polymerization and consisting of repeating structural units. Polymeric materials includethermoplastic, thermosetting, and elastomeric materials. A thermoplastic material is able to be easilysoftened and resoftened by repeated heating. A thermosetting material cures by chemical reaction whenheated and, when cured, is unable to be resoftened by reheating. An elastomeric material is capable ofbeing stretched at room temperature to at least twice its length under low stress and recovers to itsoriginal length when released from the stress.
2.32 PORTABLE CABINET LIGHT – A portable lamp intended for final installation into a cabinet (openor enclosed) such as a china hutch, bookcase, bar, console, bed headboard,or similar furniture.
2.33 PORTABLE LUMINAIRE – A portable luminaire, also commonly known as a portable lamp,asdefined in the scope of the Standard. For purposes of requirements in the Standard, the term “portableluminaire ”，”luminaire ”，and “unit” are used interchangeably.
2.34 POWER-SUPPLY CORD FITTER – That portion of the assembly that terminates the power-supplycord at the track, connecting the conductors to the bus bars in the track.
2.35 REACTANCE BALLAST – A ballast, the impedance of which is provided by:
a) Inductive reactance;
b) Capacitive reactance; or
c) Both inductance and capacitive reactance.
2.36 REACTOR (SIMPLE REACTANCE) BALLAST – A reactance type ballast in which the impedanceinductive reactance) is provided by a single coil and core not a transformer. A reactor ballast usuallyhas one lead in and one lead out.