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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

Trunk Cable

In telecommunication or CATV systems, the transmission cable from the head end (signal pickup) to the trunk amplifier. Used to feed individual distribution areas, villages, towns or clusters of service customers. The primary design requirements are low attenuation and good signal transmission capability.

Trunk Feeder

A feeder that connects two generating stations or a generating station and an important substation.

TS

Designation for: 1) Two or three-conductor rubber insulated and jacketed tinsel cord. Light duty, attached to an appliance of 50 W or less. For use in damp places in short lengths (less than 3 meters. 2) Tensile Strength.

TSO

Designation for tinsel cord that is similar to Type TS, but with neoprene jacket, 125V.

TST

Designation for similar to TS, but all thermoplastic-insulation and jacket.

TT

Designation for polyvinyl chloride insulation and sheath, aerial and duct.

Tubular Conductor

A bus conductor of any tube section.

Tubular Product

A general term for Hollow Shape, Semi-Hollow Shape and Tube.

Tubular Shape

Tube of non-uniform wall thickness or of irregular periphery or both.

Tubular Strander

See Strander, Tubular.

Tufftriding

A form of surface hardening, the process involves nitrogen but does not achieve the hardness of conventional nitriding. See nitriding.

Tumbling

Cleaning small articles like castings or forgings by rotating in a cylinder, or tumbling barrel, with a cleansing agent and also often with metal slugs or abrasives to increase the cleaning action to remove sand, scale or fins. It may be done dry or with aqueous solution. Sometimes called rumbling or rattling.

Tundish

The pouring spout mounted on a casting machine to deliver molten metal into a casting groove during a continuous casting operation.

Tungsten

Element, chemical symbol W. Gray metal with a very high melting point, 3410°C (6170°F), and high tensile strength. Ductile and malleable, immune to atmospheric influences and all acids but strong alkalis. Extremely pliable. Can be drawn into filament for incandescent bulbs or mixed in a powdered form with carbon and embedded in soft metal (such as cobalt) to produce carbide tools or alloyed within steel to make abrasion-resistant tool and die steels.

Tungsten Carbide

This is the hard con­stituent of cemented tungsten carbide that is used in the manufacture of cemented tungsten carbide wiredrawing dies and cutting tool tips. See Die, Tungsten Carbide.

Tungsten Wire

Wire produced from tungsten in powder form that has been subjected to pressure. The tungsten thus formed is fused or sintered by passing an electric current through it. It is then swaged into a rod by mechanical hammers. Lubricated with graphite, this rod is then heated and pulled through tungsten carbide dies to reduce its diameter. Fine wires are produced by either chemical etching, usually in a fused mixture of sodium nitrate and nitrite, or by warm drawing, single die or multi-die draw bench.

Tuning

The adjustment of a circuit or system to secure optimum performance.

Tunneling

If the wire drawing compound fails to move freely by gravitational force or mechanical agitation in the soap box, it will compact into a dense mass through which the moving wire will form a channel. Once tunneling occurs, there is a loss of contact between the wire and the dry lubricant and, as a result, the die system is starved for lubricant and damage to the wire and die surface will occur.

Turbulence Defect

Type of defect generated in a product which could be caused by molten metal splashing or swirling against the mold, particularly at the start of pouring of each bar.

Turks Head

Two rolling mills together, with one rolling in a horizontal direction and the other in a vertical direction, and in which the axles of all rolls are in the same plane. This permits the rolling of squares, rectangles and trapezoids, among other shapes. Unlike the rolling mill, however, it is generally friction driven, which necessitates the use of a shedding drum or capstan to pull the wire through.
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