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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

Ungrounded

Not connected to the earth. In some situations “ungrounding” is intentional as part of the circuit. In other cases where the lack of a ground is unintentional, a safety hazard to equipment and personnel exists.

Unidirectional Concentric Stranding

Stranding where each successive layer has a different lay length thereby retaining a circular form without migration of strands from one layer to another.

Unidirectional Conductor

Conductor constructed with a central core surrounded by more than one layer of helically laid wires, with all layers having a common direction of lay, with an increase in length of lay for each successive layer.

Unidirectional Stranding

A term denoting that, in a stranded conductor, all layers have the same direction of lay.

Uniform Strain

1) The strain occurring prior to the beginning of localization of strain (necking). 2) The strain at the maximum load in the tension test.

Unilay

A conductor with more than one layer of helically laid wires with the direction of lay and length of lay the same for all layers.

Unilay Conductor

A conductor constructed with a central core surrounded by more than one layer of helically laid wires, with all layers having a common length and direction of lay.

United States Steel Wire Gauge

A name sometimes applied to Steel Wire Gauge (Washburn & Moen Gauge) to distinguish it from the Standard Wire Gauge.

Units, Conductors

The grouping of twinned conductors used in forming a cable. Usually 25 pairs. The units may be divided into such units of 12 and 13 pairs or 8, 8 and 9 pairs.

Unloading Unit

A spoon-type receiving tray located at the end of a conveyor. It is synchronized with the movement of the conveyor to transfer the coil to one arm of the capstan, which is then rotated to present the coil on loading station.

Unsintered

Uncured. This word is often used to differentiate between cured and uncured Teflon® tape.

Upender, Coil

A device that puts a coil in the vertical position, suitable for pick-up by an overhead conveyor hook.

Upending Test

See Upsetting Test.

Uplift Roller

A small pulley above a traveler to keep a conductor from lifting out of the traveler. For example, on a wire traversing unit for a spooler.

Upset Burr

A burr created by the flow of metal during a butt-welding of rod.

Upset Pressure

Pressure used during the butt-welding cycle to ensure a good weld with both ends of the material.

Upsetting

1) A metal working operation similar to forging. 2) The process of axial flow under axial compression of metal, as in forming heads on rivets by flattening the end of a wire.

Upsetting Test

A test for the detection of surface defects in rod and wire. A small sample is cut, then loaded in compression along the longitudinal axis. The resulting barrel-shaped sample will exaggerate surface imperfections, making them visible to the unaided eye. This test is particularly useful for severe forming or heading applications. Also known as the Upset or Upending Test.

URC

Designation for weatherproof wire.
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