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Term Description
Dielectric Breakdown The voltage at which a dielectric material is punctured, which is divisible by thickness to give dielectric strength
Dielectric Constant (K) The ratio of the capacitance of a condenser with dielectric between the electrodes to the capacitance when air is between the electrodes (also called Permittivity and Specific Inductive Capacity)
Dielectric Strength The voltage which an insulation can withstand before breakdown occurs. Usually expressed as a voltage gradient (such as volts per mil).
Dielectric Test A test in which a voltage higher than the rated voltage is applied for a specified time to determine the adequacy of the insulation under normal conditions
Direct Burial Cable A cable installed directly into the Earth
Direct Capacitance The capacitance measured directly from conductor to conductor through a single insulating layer
Direct Current (DC) An electric current which flows in only one direction
Direct Current Resistance (D.C.R.) The resistance offered by any circuit to the flow of direct current
Dissipation Factor The tangent of the loss angle of the insulating material (also referred to as loss tangent, tan S, and approximate power factor)
Double Foot The combined length of one linear foot of paired material; i.e., one double foot is equal to one foot of positive material plus one foot of negative material (usually used in determining thermocouple wire loop resistance)
Drain Wire In a cable, the uninsulated wire in intimate contact with a shield to provide for easier termination of such a shield to a ground point
Drawing In wire manufacturing, pulling the metal through a die or series of dies to reduce diameter to a specific size
Duct An underground or overhead tube for carrying electrical conductors
Duplex Insulated In the thermocouple industry, a combination of dissimilar metal conductors of a thermocouple or thermocouple extension wire
Eccentricity Like concentricity, a measure of the center of a conductor's location with respect to the circular cross section of the insulation (expressed as a percentage of displacement of one circle within the other)
ECTFE A copolymer of ethylene and chlorotrifluoroethylene that provides excellent chemical and abrasion resistance as well as mechanical strength. Used mostly as an insulation.
EIA Abbreviation for Electronic Industries Association
Elastomer A rubber-like substance
Electromagnetic Pertaining to the combined electric and magnetic fields associated with movements of electrons through conductors
Electromagnetic Interference (EMI) Any electromagnetic disturbance that interrupts or limits the performance of electrical or electronic devices
Electromotive Force Pressure or voltage; the force which causes current to flow in a circuit
Electrostatic Pertaining to static electricity or electricity at rest; a constant intensity electric charge
Electrostatic Interference Any electrostatic interference such as motor spiking
Elongation The fractional increase in length of a material stressed in tension
EMF See definition of "Electromotive Force"
EMI Abbreviation for Electromagnetic Interference
Ends In braiding, the number of essentially parallel wires or threads on a carrier
Ethylene Propylene Rubber (EPR) An ozone resistant rubber consisting primarily of ethylene propylene copolymer (EPM) or ethylene propylene diene terpolymer (EDPM)
Ethylene-Tetrafluorethylene-Copolymer (ETFE)
External Interference The effects of electrical waves or fields which cause sounds other than the desired signal (static).

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