THERMOSET - A material which hardens or sets when heat is applied, and which, once set, cannot be re-softened by heating. The application of heat is called “curing”.
THERMOSTAT WIRE - Single or multi-conductor wire, bare soft solid copper conductor, usually PVC insulated. May be twisted and/or jacketed. May have enameled or nylon covered conductors and may have a metal armor covering. May also have a high temperature barrier insulation. It is used to transmit electrical signals between the thermostat and the heating or cooling unit.
THHN - Building wire, plastic insulated, 90° C, 600 volt, nylon jacket. Used in dry locations.
THINNET - RG58 type coaxial cable used in local area network configurations.
THW - Building wire, plastic insulated, heat, flame, and moisture resistant, 75° C.
THWN - Same as THW with overall nylon jacket. Used in dry and wet locations.
TIGHT BUFFER - Type of fiber optic cable construction where each fiber is tightly buffered by a protective thermoplastic coating to a diameter of 900 microns.
TINNED COPPER - Tin coating added to a copper conductor or braid to aid in soldering and inhibit corrosion. Abbreviated as TC.
TINSEL CORD - Extra flexible cord made with tinsel conductors to give the ultimate in flexibility. Used mostly in the communications field on headsets, handsets, and anywhere that repeated flexibility is necessary.
TINSEL WIRE - A low voltage, stranded wire in which each strand is very thin copper ribbon spirally wrapped around a textile yarn. Insulation is generally a textile braid. Intended for use where severe flexing is expected.
TOKEN RING - A star-wired ring architecture used for computer LAN data communications.
TOLERANCE - a) The allowable deviation from a standard especially the range of variation permitted in maintaining a specified dimension in machining a piece; or b) The variance between the quantity ordered and the quantity shipped, generally accepted in the wire industry to be plus or minus 10%.