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The Book of Terms

The Book of TermsThe WJI Book of Wire & Cable Terms: an interactive experience of learning and sharing
This book, written by industry volunteers and containing more than 5,000 entries, is an asset for newcomers to wire and cable.

At the same time, it also represents an opportunity for industry veterans to give back by either updating or adding to the more than 5,000 entries. This is an honor system process. Entries/updates must be non-commercial, and any deemed not to be so will be removed. Share your expertise as part of this legacy project to help those who will follow. Purchase a printed copy here.


All   0-9   A B C D E F G H I J K L M N O P Q R S T U V W X Y Z


Used as a suffix to indicate a twin wire with two insulated conductors laid parallel under an outer, non-metallic covering.

D Cable

A two-conductor cable, each conductor having the shape of the capital letter D with insulation between the conductors themselves and between conductors and sheath.

D-Gun Coating

An approach to reduce screw wear on screw conveyors. This is a hard coating application on the screw’s surface by a device called a “detonation gun.” The D-Gun technique can apply a thin overlay encapsulating the wear areas of the screw.


Low-cost devices for the wire user to ensure efficient wire payout from containers of the pay-off pak type.


Designation for Direct Current (see entry).

Daisy Chain

A cable assembly with three or more connectors. The term is also used as a verb.

Dam Block Chains

A component in the continuous casting equipment that creates the dams to hold molten material as it is poured for casting a continuous block.


The dissipation of energy with time or distance.

Danaert Wire

See Concertina Wire.


A device used to control speed and/or tension that uses a movable element around which the wire is passed. The movable element responds to changes in speed of delivery or removal by changing its position to either accumulate more or less wire. Tension is controlled by regulating the resistance to movement of the dancer. The position and/or motion can be used for speed regulation of either the delivery or receiving machinery. When a dancer assembly to control tension is used for a rolling mill, it is usually housed within an independent chamber so that the atmosphere can also be controlled.

Dancer Loop

A simpler approach to controlling tension whereby a loop is in the flow of wire or rolled products, which is hung between two idler rolls. The weight of the dancer performs the automatic tensioning by adjusting to the variation in length of material as it passes through.

Dancer Rolls

A tensioning mechanism with a free roll that oscillates up and down to control tension on the product being manufactured. Used mainly for smaller sections of wire at high rates of speed to protect the weak wire from undesirable stretching. The dancer rolls will exert constant tension on the wire at the same time having some means of automatically controlling the relative speed of the components on either side. This is sometimes called storage or an accumulator.

Data Transmission Cables

Cables designed to provide data information transmitted within computers, or between the computer and the associated peripheral equipment. These are achieved by lowering the dielectric constant in the insulating material.

Davy-Lamp Cloth

This flameproof mesh, which allows free diffusion of air or gas, is used for ventilators where explosive gases are present as well as for miners’ safety lamps. It is used for safety lamps, which were invented/improved by Sir Humphrey Davy in 1815. His light was covered by a tight-fitting cylinder of wire-gauze containing 784 apertures to the sq in.


Designation for decibel(s). See entry.

dB Loss

See Decibel, Loss.


Decibels referred to 1.34 x 10-9 hp or 5.69 x 10-8 Btu/min (one milliwatt), which flows always in the same direction. Further classifications of direct currents are: 1) continuous currents which are steady, non-pulsating direct currents. 2) constant currents, which continue to flow for a con­siderable time in the same direction and with unvarying intensity. 3) pulsating currents, which are regularly varying con­tinuous currents.


Designation for Double Braided Weatherproof cable.


Designation for Direct Current (see entry).

DCC Wire

Designation for Double Cotton Covered magnet wire.

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