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Term Description
D.C.Abbreviation for "Direct Current"
Decibel (dB)A unit to express difference of power level. Used to express power gaining amplifiers or power loss in passive circuits of cables.
Delay LineA cable made to provide very low velocity of propagation with long electrical delay for transmitted signals
Derating FactorA factor used to reduce the current carrying capacity of a wire when used in environments other than that for which the value was established
DielectricAny insulating material between two conductors which permits electrostatic attraction and repulsion to take place across it
Dielectric AbsorptionThat property of an imperfect dielectric whereby there is an accumulation of electric charges within the body of the material when it is placed in an electric field
Dielectric BreakdownThe 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 StrengthThe voltage which an insulation can withstand before breakdown occurs. Usually expressed as a voltage gradient (such as volts per mil).
Dielectric TestA 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 CableA cable installed directly into the earth
Direct CapacitanceThe 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 FactorThe tangent of the loss angle of the insulating material. (Also referred to as loss tangent, tan S, and approximate power factor).
Double FootCombined 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 WireIn a cable, the uninsulated wire in intimate contact with a shield to provide for easier termination of such a shield to a ground point
DrawingIn wire manufacturing, pulling the metal through a die or series of dies to reduce diameter to a specific size
DuctAn underground or overhead tube for carrying electrical conductors
Duplex InsulatedIn the thermocouple industry, a combination of dissimilar metal conductors of a thermocouple or thermocouple extension wire