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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

RU

Designation for rubber insulated, latex building wire, heat resistant to 60°C (140°F) and moisture resistant.

Rubber

An elastomer capable of rapid elastic recovery. Specifically, natural rubber, the standard of comparison for elastomers. Wire insulation and jackets made of thermosetting elastomers, such as natural or synthetic rubbers, EPR, neoprene, Hypalon, butyl rubber and others.

Rubber Extruder

A screw extrusion process for vulcanizable rubber. A basic approach since the late 1800s that has been modified to adapt for plastics extrusions.

Rubber Insulation

Used for power cables of up to 1 kV and usually applied by ex­truding the rubber around the conductor. Another method is to pass the conductor sandwiched between two rubber tapes through grooved rollers that pressure-weld the rubber to form an insulating layer. The longitudinal machine used to carry out this process has two or three sets of rollers in series to apply layers of rubber to a number of conductors simultaneously.

Rubber, Chlorosulfonated Polyethylene

A synthetic rubber insulation and jacket compound.

Rubber, EPCV

A synthetic rubber insulation that is a co-vulcanizate of EP and PE.

Rubber, Ethylene Propylene

A synthetic rubber insulation with excellent electrical properties.

Rubber, Wire Insulation and Cable Sheath

Wire insulation and cable sheath made of thermosetting elastomers.

Rubbing

One of the early processes in needle manufacture in which the lengths are rubbed at a dull red heat between steel rings to ensure absolute straightness.

Rubmark

A minor form of scratching consisting of areas made up of a large number of very fine scratches or abrasions. See Torn Surface and Scratch.

Ruby Dies

Used before diamond dies were introduced and may still be useful for soft metals such as gold and silver. Cheaper than diamond dies, but performance similar to tungsten carbide dies.

RUH

Designation for rubber insulated, latex building wire, heat resistant to 60°C (140°F) and moisture resistant.

Rulan

DuPont’s trade name for its flame-retardant polyethylene insulating material.

Run Out

Escape of molten metal from a furnace, mold or melting crucible.

Runner

A channel through which molten metal or slag is passed from one receptacle to another.

Running Board

A device to permit stringing more than one conductor simultaneously.

Running Out

Increase in wire size during drawing due to excessive wear of the die.

Rupture

In the breaking strength or tensile strength tests, the point at which the material exceeds its elastic limit and physically comes apart, as opposed to elongation or yield strength.

RUS

Designation for Rural Utilities Service.

Rust

A corrosion product consisting of hydrated oxides of iron. Applied only to ferrous alloys.
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