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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

Distribution Cable

In telecommunications and CATV systems, the transmission cable between the distribution amplifier and the drop wire. Also, term used for power cables on transmission lines with high voltage and sub-transmission lines with lower voltage.

Distribution Frame

A structure with terminations for connecting the permanent cabling of a facility in such a manner that interconnection or cross-connections may be readily made.

Distribution, Statistical Analysis

A statistical method used to analyze data by correlating data to a theoretical curve to: a) test validity of data; or b) predict performance at conditions different from those used to produce the data.

Disturbed Conductor

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

Disturbing Conductor

A conductor carrying energy that creates spurious signals in another conductor.

Diversity Factor

The ratio of the sum of load demands to a system demand.

Dividing Shear

A rotary drum-type shear located after the last stand of the mill that may be used to crop (cut) front-end sample pieces.

Divorced Eutectic

This condition, which occurs because of inhomogeneity, can be seen metallographically when one of the two constituents in an eutectic structure appears as a massive phase embedded in the second phase, which is continuous, rather than as layers or pearlitic lamellae. The continuous eutectic constituent is usually indistinguishable from the accompanying proeutectoid constituent. It should be emphasized that this condition only occurs with as-cast microstructures of eutectic alloys, and in particular, the terminal solid solutions. A well-known alloy having this condition is sterling silver (7.5% copper, balance silver). Often, the microstructure of divorced eutectics will be eliminated by wiredrawing and subsequent annealing, homogenization, or solution heat treatments.

DMM

Designation for digital multimeter. See VOM.

DOA

Designation for diameter overall.

DOC

Designation for Diameter Over Conductor; note that for cables having a stress control, the diameter over the stress control layer becomes the DOC.

Dog Legs

Kinks in the curvature of wire that cannot be easily straightened.

Dogras

A grease used as a wiredrawing lubricant. Also known as wool fat or lanolin. It is a suitable lubricant for drawing large-diameter, copper-coated steel wire on a bull block.

DOI

Designation for Diameter Over Insulation.

DOJ

Designation for Diameter Over Jacket.

Dolomite

A mineral made up of calcium and magnesium carbonates. It is used in calcium carbonate, which is used for many applications, including as a filler for cable.

DOS

Designation for Diameter Over Insulation Shield.

DOSC

Designation for Diameter Over Stress Control.

Double Block

A means of obtaining a non-slip accumulation type wiredrawing machine without the use of overhead take­off pulleys so as to avoid twist in the wire. A second block is mounted above the drawing block and on the same spindle, but the upper block is free to rotate in either direction. Wire is transferred from one block to the other via a pulley. The term double deck block is more properly applied to a bull block designed to produce a double draft.

Double Capstan

This consists of two driven wheels, a frame and a driving unit. It is mainly used to pull wire through a Turks Head in the same way as a shedding drum. Unlike a shedding drum, the wire is not bundled on the capstan. This prevents lateral rubbing of the wire and permits a much greater pull to be applied to the wire coming through the Turks Head.

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