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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


Designation for rubber-insulated building wire, 600V, 60°C (140°F).

R Series

Designation for carbide nibs sizes for wiredrawing dies.


An enclosed channel designed for holding wires or cables, including conduit, electrical metallic tubing, sleeves, slots, underfloor raceways, cellular floors, surface raceways, lighting fixture raceways, wireways, cable troughs, busways and auxiliary gutters.


The vertical or horizontal open support system with shelves that is used to store material.

Rack (Cable)

A device to support cables over a distance.

Radial Extrusion

Technique of extruding a product using a wheel and radially feeding the stock into a die designed for the product profile.

Radial Feeder

A feeder connected to a single source.

Radial Lead

A lead extending out the side of a compartment rather than from the end. See Axial Lead.


A supplementary SI unit for plane angles; the plane angle with its vertex at the center of a circle that is subtended by an arc equal in length to the radius. Many equations involving wiredrawing use this unit instead of angles.

Radiant Energy

Energy traveling in the form of electromagnetic waves.

Radiant Heater Wire

Type of wire wrapped around a core for heating elements. Also called Mullion Wire and Resistance Wire.

Radiant Tube Furnace

See Furnace, Radiant Tube.

Radiation Crosslinking

A common technique to crosslink polymeric material. The crosslinking is performed by passing the wire or cable through a beam of electron radiation. Wire or cable is usually festooned on a series of pulleys and passed through the beam several times until the desired dosage is reached.


Refers to the use of electromagnetic waves between 10 kHz and 3 GHz and their transmission through space.

Radio Frequency

The frequencies in the electromagnetic spectrum that are used for radio communications.

Radius, Bending

The radii around which cables are pulled.

Radius, Training

The radii to which cables are bent by hand positioning.

Rainbow Cable

Two or more insulated conductors of different colors bonded into two flat parallel configurations.


Designed so that exposure to even a beating rain will not result in water penetration.

Ram Extrusion

A type of extrusion in which a hydraulic ram in a closely fitted cylinder forces a billet of insulating material through an affixed head and a die and around the conductor as it is passed through the die. This is a common extrusion technique required for some insulating materials.

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