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D.C.

Direct Current

Damp Location

An outdoor location that is partially protected from weather or an indoor location subject to a moderate degree of moisture, such as a basement.

DBWP

Double Braided WeatherProof cable

Decibel (db)

A unit to express differences of power level. Used to express power gain in amplifiers or power loss in passive circuits or cables.

Dedicated Circuit

In a residence, a 120, 120/240, or 240 volt circuit that is installed to supply power to specific equipment indoors or outdoors, such as a large appliance or heating and air conditioning equipment.

Degree Rise

The amount of increase in temperature caused by the introduction of electricity into a unit.

Delay Line

A cable made to provide very low velocity of propagation with long electrical delay for transmitted signals.

DEMKO

Approval agency of Denmark.

Depth of Crimp

Thickness of the crimped portion of a connector measured between two opposite points on the crimped surface.

Derating Factor

A factor used to reduce the current-carrying capacity of a wire when used in environments other than that for which the value was established.

Design Voltage

Voltage for which a cable is designed.

Dessicant

Water or moisture absorbent material used to prevent moisture from damaging packaged equipment or other merchandise.

Die

A device used in the drawing of a wire; the element through which the wire is drawn, to achieve a predetermined diameter. A mold used to form a plastic compound around a wire or cable.

Dielectric

An insulating medium which intervenes between two conductors and permits electrostatic attraction and repulsion to take place across it.

Dielectric Breakdown

The voltage required to cause an electrical failure or breakthrough of the insulation.

Digital

Transmission data representative by discrete characters.

Dip Coating

An insulating coating applied to the conductor by passing the conductor through an applicator containing liquid insulating medium.

Direct Burial Cable

A cable installed directly in the earth.

Direct Capacitance

The capacitance measured directly from conductor to conductor through a single insulating layer.

Direct Current

An electric current which flows in only one direction.

Direct Current Resistance (DCR)

The resistance offered by any circuit to the flow of direct current.

Direction of Lay

The lateral direction in which the strands of a conductor run over the top of the cable conductor as they recede from an observer looking along the axis of the conductor or cable. Also applies to twisted cable.

Discrete Wiring

Wire or wires having distinct identity and purpose.

Disruptive Discharge

A sudden, large increase in current through an insulation medium due to the complete failure of the medium under the electrostatic stress.

Disturbed Conductor

A conductor that receives energy generated by the field of another conductor or an external source, such as a transformer.

Drain Wires

A number of small gauge bare wires applied concentrically about the insulation shield of a high voltage cable for the purpose of a fault current return path.

Draw Feed Stock

Rod or wire that is subsequently drawn to a smaller size.

Drawing

In wire manufacture, pulling the metal through a die or series of dies to reduce diameter to a specified size.

DRT

Plastic range and dryer cord (CSA).

Dry Location

A location not normally subject to dampness or wetness.

Dual Coaxial Cable

Two individually-insulated conductors laid parallel or twisted and placed within an overall shield and sheath.

Duct

An underground or overhead tube for carrying electrical conductors.

Duplex

Two-way data transmission on a four-wire transmission line.

Duplex Cable

A cable composed of two insulated single-conductor cables twisted together.

Duplex Parallel

Typically used in the thermocouple industry to denote two parallel conductors of dissimilar metals insulated in parallel without twists and jackets. Commonly applied to thermocouple grades and extension wires.

Durometer

A measure of hardness.

Duty Rating

A rating that describes the ability of an electric device to carry a current load for a given frequency of use.

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