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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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