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Tank Test.
A voltage dielectric test in which the test sample is
submerged in water and voltage is applied between the
conductor and water as ground.
Tape Wrap. A spirally applied tape over
an insulated or uninsulated wire.
TC. Tray cable. Article 340 NEC.
Tear Strength. The force required to
initiate or continue a tear in a material under specified
conditions.
Teflon. A DuPont Company trademark for
fluorocarbon resins. FEP, PFA and TFE are typical materials.
Tefzel. DuPont trade name for a fluorocarbon
material typically used as a wire wrap insulation.
Telemetry Cable. Cable used for transmission
of information from instruments to the peripheral recording
equipment.
Temperature Rating. The maximum temperature
at which an insulating material may be used in continuous
operation without loss of its basic properties.
Tensile Strength. The pull stress required
to break a given specimen.
Test Lead. A flexible, insulated lead
wire used for making tests, connecting instruments to
a circuit temporarily, or for making temporary electrical
connections.
Textile Braid. Any braid made from threads
of cotton, silk, or synthetic fibers.
TFFN. Fixture wire, thermoplastic-covered
solid or 7 strands with nylon sheath. 60C.
Thermal Aging. Exposure to a thermal
condition or programmed series of conditions for predescribed
periods of time.
Thermal Rating. The maximum and/or minimum
temperature at which a material will perform its function
without undue degradation.
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 consisting of
two dissimilar metals in physical contact, which when
heated will develop an emf output.
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 pairs of 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.
Thermoplastic. A material which softens
when heated and becomes firm on cooling.
THHN. 90C, 600 volt, nylon jacketed building
wire for dry locations.
THW. Thermoplastic vinyl insulated building
wire. Flame-retardant, moisture and heat- resistant. 75C
Dry and wet locations.
THWN. Same as THW but with nylon jacket
overall. 75C.
Tin Overcoat (TOC). Tinned copper wire,
stranded, then coated with pure 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, each thread having
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 pure tin.
Tracer. A means of identifying polarity.
Transfer Impedance. For a specified cable
length, transfer impedance is defined as the ratio of
internal longitude in a voltage to external current flow
on the cable shield. Transfer impedance is used to determine
shield effectiveness against both the ingress and egress
of interfering signals.
Transmission. Transfer of electric energy
from one location to another through conductors or by
radiation or induction fields.
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.
Transparent. (fiber optic) Transmitting
rays of light so that objects can be seen through the
material.
Tray. A cable tray is a unit or assembly
of units or sections, and associated fittings, made of
noncombustible materials forming a rigid structural system
used to support cables.
Tray Cable. A factory-assembled multiconductor
or multipair control, signal or power cable specifically
approved under the National Electrical Code for installation
in trays.
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 variation 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 nonsupported
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.
Twin Line. A transmission line which
has a solid insulating material, in which the two conductors
are placed in parallel to each other.
Twinner. A device for twisting together
two conductors.
Twisted Pair. A twisted pair is composed
of two small separately insulated wires twisted together
without a common covering.
Twisted Triad. Any three individually
insulated conductors which are twisted together.
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