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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

Pull Wire

See Pull Cord.

Pull-Over Mill

An early rolling mill that did not have the ability to reverse the prime mover and it was necessary to grab the tail end of stock with tongs as it left the mill and carry it back over the mill so the bar could be entered into the next pass.

Pulley

A wheel or disk with a grooved rim used to support, change direction or apply tension to a wire or cable during processing, installation and other handling activities. Also used with a metal or synthetic rope as a simple machine to hoist or pull objects. At one time a sheave meant a grooved disk and a pulley was a sheave mounted on an axle, but both words are commonly interchanged.

Pulling Compound

A substance applied to the surface of a cable to reduce the coefficient of friction during installation.

Pulling Eye

A device which may be fastened to the conductor or conductors of a cable or formed by or fastened to the wire armor and to which a hook or rope may be directly attached in order to pull the cable into or from a duct. There are three types of innerduct pulling eyes: swivel head, clevis head and fixed head.

Pulling Force

The force exerted on a conductor during installation.

Pulling-In Dog

A type of clamp used on a wiredrawing machine to grip the end of the wire when threading up. The dog is attached to a chain and hooked into the drawing block, enabling the wire to be drawn through the die and a few turns around the block. When a sufficient number turns have been drawn, it is detached from the block and the end secured.

Pulling-In Machine

Used for threading up rods or heavy wires in a wiredrawing machine. Frequently combined with a pointing machine. Used chiefly on nonferrous tandem machines, enabling a number of dies to be threaded up in se­quence.

Pulp Core Lay-ups

Lay-up is the assembling of cores with wires in some type of form or profile. Usually concentric. Pulp Core indicates the material is a paper-insulated core.

Pulpit

Control center of a rolling mill where an operator manipulates and monitors the various devices necessary to maintain the motion of the mill under controlled conditions.

Pulsating Function

A periodic function whose average value over a period is not zero.

Pulse

A current or voltage that changes abruptly from one value to another and back to the original value in a finite period. Used to describe one particular variation in a series of wave months. May be light energy or electrical energy.

Pulse Cable

A type of coaxial cable constructed to transmit repeated high voltage pulses without degradation. Usually multi-shielded. Operates at very high voltage.

Puncture

A breakdown in an insulation.

Purge

To clean. In extrusion, to extrude the material currently in the barrel onto the floor until it is replaced with new material that has been fed into the throat of the extruder. A process required to make a change in extruded materials.

Purled Wire

Wire that has been twisted together. One such application is for speaker wire, where solid silver wire may be tightly purled (“micro-purled”) to reduce EMI and RF noise for superior sound quality.

Push Back

That property of a braid or shield that allows the braid or shield to be pushed back along the cable core easily.

Push Bench

Equipment used for drawing heavy-gauge tubes by cupping sheet and forcing it through a die by pressure against the bottom of the cup.

Push Button

A switch activated by buttons.

Pusher Furnace

See Furnace, Pusher Type.
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