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The Book of Terms

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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.

   

 

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

VSWR

Designation for voltage/standing/wave/ratio. The ratio of the voltage maximum to voltage minimum that exists in a transmission line. Caused when there is reflection of incident wave, due to a discontinuity or improper match to the transmission line. See Standing Wave Ratio.

VTVM

Designation for a high impedance VOM.

Vulcanization

A chemical reaction in which the physical properties of an elastomer are changed by reacting it with sulfur or other cross-linking agents.

Vulcanize

To cure by chemical reaction that induces extensive changes in the physical properties of a rubber or plastic, brought about by reacting it with sulfur and/or other suitable agents. Changes include decreased plastic flow, reduced surface tackiness, increased elasticity, much greater tensile strength and considerably less solubility: the process being hastened by heat and pressure: the method of curing thermosetting materials – rubbers, XLP, etc. See Rubber Insu­lation.

VW-1

Designation for a UL rating given single conductor cables as to flame resistant properties, formerly FR-1.

W

1) An initial used in building wire codes to indicate weather resistance. 2) Designation for watt.

W/G

Designation for with ground.

W/O/G

Designation for without ground.

WA

Designation for Wire Armored.

Waffle Arm

1) A loose arm mounted coaxially on the top of a block and used for controlling the tension of wires between blocks. 2) Used on overhead take off (OTO) type, accumulation blocks.

Wahl Factor

An allowance for the fact that a higher fiber stress exists on the inside coil surface of a loaded spring than on the outside surface.

Waisted Springs

See Hourglass Springs.

Wall

See Wall Thickness.

Wall Thickness

A term expressing the thickness of a layer of applied insulation or jacket.

WAN

Designation for Wide Area Network which is a network spanning a broad geographical area, providing data communications between computers and peripherals and switching equipment.

Warp

The wires (or threads) that run the length of a piece of woven material. The weft are the horizontal wires/threads.

Warp Beaming Machine

A machine for filling the beams with wire separately from the wire weaving loom to save time when several looms are in operation.

Warrington

A strand construction in which one layer of wires, often the outer, is composed of alternating large and small wires.

Wash-Heat Metal

A metallurgical term to depict a metal resulting from a heating process that may not have a given set of elements in its alloy.

Water Absorption

Ratio of the weight of water absorbed by a material to the weight of the dry material.
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