Master Catalog Page 577 Glossary

Alpha Wire www.alphawire.com 1-800-52 ALPHA Specifications subject to change. For complete specifications and availability, visit www.alphawire.com. 577 tape wrap A spirally applied tape over an insulated or uninsulated wire. TC Tray cable. TC-ER Tray cable, extended run. tear strength The force required to initiate or continue a tear in a material under specified conditions. temperature coefficient of resistance The amount of resistance change of material per degree of temperature rise. temperature rating The maximum and minimum temperature at which an insulating material may be used in continuous operation without loss of its basic properties. Tempest Classified procedure which details the complex measurement of the combined reduction of all electromagnetic emissions from specified equipment. tensile strength The pull stress required to break a given specimen. TFE Polytetrafluoroethylene. thermal shock A test to determine the ability of a material to withstand heat and cold by subjecting it to rapid and wide changes in temperature. thermocouple A device for measuring temperature, at the point where two dissimilar metals are joined, and EMF output is generated when heated. thermocouple element A thermocouple designed to be used as part of an assembly, but without associated parts such as the terminal block, connecting head, or protecting tube. thermocouple extension cable A cable comprised of one or more twisted thermocouple extension wires under a common sheath. thermocouple extension wire A pair of wires of dissimilar alloys having such EMF-temperature characteristics complimenting the thermocouple which is intended to be used, such that when properly connected allows the EMF to be faithfully transmitted to the reference junction. thermocouple wire (grade) A pair of wires of dissimilar alloys having EMF-temperature characteristics calibrated to higher temperature levels than the extension type of thermocouple wire. Unlike the thermocouple extension wire, this wire may be employed as the thermocouple hot junction in addition to serving as the entire wire connection between hot and cold reference junctions. thermoplastic A material which softens when heated or reheated and becomes firm on cooling. thermoset A material which hardens or sets by heat, chemical or radiation cross-linking techniques and which, once set, cannot be resoftened by heating. THHN 90C, 600 volt, nylon jacketing building wire for dry locations. THWN 75C, 600 volt, nylon jacketed building wire for wet and dry locations. tinned copper Tin coating added to copper to aid in soldering and inhibit corrosion. topcoat conductor A conductor construction in which bare copper wires are first stranded and then coated with tin. transformer A device for converting AC current from one voltage to another either "stepped up" or "stepped down." transmission cable Two or more transmission lines. If the structure is flat, it is sometimes called flat transmission cable to differentiate it from a round structure such as a jacketed group of coaxial cables. See transmission line. transmission line A signal- carrying circuit with controlled electrical characteristics used to transmit high-frequency or narrow-pulse signals. transmission loss The decrease or loss in power during transmission of energy from one point to another. Usually expressed in decibels. tray A cable tray system is a unit or assembly of units or sections, and associated fittings, made of metal or other noncombustible materials forming a rigid structural system used to support cables. Cable tray systems (previously termed continuous rigid cable supports) include ladders, troughs, channels, solid bottom trays, and similar structures. tray cable A factory-assembled multiconductor control, signal and power cable specifically approved under the National Electrical Code for installation of trays. triad A group of 3 insulated conductors twisted together without (or with) a sheath overall. Usually color coded for identification. Also called triplex. triaxial cable A cable construction having three coincident axes, such as conductor, first shield and second shield all insulated from one another. Glossary

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