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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

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.

Rust Preventive

Any product (grease, oil, or solvent-based) that when applied to a ferrous surface, provides a film for corrosion protection. The duration of the protection is dependent upon the chemistry and film thickness provided.

Ruthenium

Element, chemical symbol Ru. A white metal noted for its hardness, the most expensive of the platinum group.

RUW

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

S

Designation for heavy duty, rubber insulated portable cord. Stranded copper conductors with separator and individual rubber insulation. Two or more color-coded conductors cabled with filler, wrapped with separator and rubber jacketed overall, 600V.

S Cord

Cord used for sturdy construction requirements such as vacuum cleaners, motors, washing machines or portable tools such as electric drills. These cords consist of two or more stranded conductors with a serving between the copper and the insulation to prevent the fine strands from sticking to the insulation. Fillers are twisted together with the conductors to make a round assembly. A jacket of high quality rubber covers the complete cord.

S/N Ratio

Signal-to-noise ratio. Useful information in a single (optical or electrical) compared to the noise that tends to interfere with transmission of information.
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