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Term Description
Thermoplastic Insulated Wires and Cables CSA (Canadian Standards Association International) Standard C22.2 No. 75-M1983; Canadian Electrical Code, Part II
Thermoset A material which hardens or sets by heat, chemical or radiation cross-linking techniques and which, once set, cannot be resoftened by heating
Thermoset Insulated Wires and Cables CSA (Canadian Standards Association International) Standard C22.2 No. 38-95; Canadian Electrical Code, Part II
THHN 90C, 600V, nylon jacketed building wire for dry locations
THWN 75C, 600V, nylon jacketed building wire for wet and dry locations
Tin Overcoat (TOC) Tinned copper wire, stranded, then coated with tin
Tinned Copper Tin coating added to copper to aid in soldering and inhibit corrosion
Tinsel A type of electrical conductor comprised of a number of tiny threads with a fine, flat ribbon of copper or other metal closely spiraled about it. Used for small size cables requiring limpness and extra-long flex life.
Topcoat Bare (untinned) copper wire, stranded, then coated with tin
Topcoated Copper Bare copper strands twisted together and a tin coating applied overall
Transfer Impedance The ratio of internal longitude in a voltage to external current flow on the cable shield. It's used to determine shield effectiveness against both the ingress & egress of interfering signals.
Transmission Line A signal-carrying circuit 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 unit/assembly of units or sections (and associated fittings) made of non-combustible materials forming a rigid structural system used to support cables
Tray Cable A factory-assembled multi-conductor/multi-pair control signal or power cable; specifically approved under the National Electrical Code for installation in trays
Tray Cables CSA (Canadian Standards Association International) Standard C22.2 No. 230-M1988; Canadian Electrical Code, Part I
Tri-Shield A type of shielding which is a foil/braid/foil
Triaxial Cable A cable construction having three coincident axes, such as conductor, first shield, and second shield all insulated from one another
Triboelectric Noise Noise generated in a shielded cable due to variations in capacitance between shielding and conductor as the cable is flexed
Triple (Triad) A cable consisting of three insulated single conductors twisted together
Triplex A cable composed of three insulated single conductor cables twisted together
Tubing A tube of extruded non-supported plastic or metallic material
Twin Cable A cable composed of two separately insulated stranded conductors laid parallel under a common covering
Twin Coaxial Cable A single cable consisting of two separate coaxial cables laid adjacent and parallel or twisted together
Twisted pair Composed of two small, separately insulated wires twisted together without a common covering
UF Thermoplastic underground feeder and branch circuit cable
UHF Abbreviation for Ultra High Frequency (300 to 3000 MHz)
UL Abbreviation for Underwriters Laboratories, a non-profit independent organization, which operated a listing service for electrical/electronic materials and equipment
Unbalanced circuit A transmission line in which voltages of the 2 conductors are unequal with respect to ground
Underwriters Laboratoris, Inc. (UL) An independent, not-for-profit product safety testing and certification organization

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