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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

Rip Cord

1) Two or more insulated conductors in a parallel configuration which may be separated to leave the insulation of each conductor intact. 2) A small filament cord placed directly under the jacket of a PIC cable to facilitate slitting the jacket for ease of removal through the outer cable sheath. Mainly used in communications cable.

Ripper Die

First die in a multiple draft set-up. Called a ripper because of the heavier reductions performed at this position in the drawing process.

Ripping

In tungsten carbide die manufac­ture, the initial process of reshaping dies that have become badly worn.

Ripple

A slight transverse wave or shadow mark repeated at intervals along the piece.

Riser

Pathways for indoor cables that pass between floors. It is normally a vertical shaft or space. The requirements for riser cable are similar to plenum cable. A riser cable rating indicates good flammability characteristics, but not necessarily low smoke as in a plenum.

Riser Cable

The vertical section of a building cable extending from one floor to another.

Rivet Test

There are two tests—the first is concerned with the shank and the second with the head of the rivet. The shank test consists of cold bending the shank and hammering until the two parts of the shank touch. There should be no sign of fracture on the outside of the bend. For the rivet head, the latter is flattened while still hot until its diameter is twice that of the shank. Cracks must not develop at the edges of the head.

Rivet Wire

The bulk is produced from mild steel, but a large quantity is fabricated in copper, brass and stainless steel. It is bright finished, with as few drafts as possible. For extra mild finish the rivets are annealed after fabrication.

Rivet Wire, Aluminum

Optimum strength combined with sufficient ductility for forming of non-heat treatable alloy wire is achieved by drawing a limited reduction, usually 10 to 20 percent from the last in­termediate anneal to finish size. With heat-treatable alloys, solution treatment is carried out after the rivet head has been formed, and if annealed wire is used, part of the shank immediately below the head has coarse grain in a most undesirable position after heat treatment. See Aluminum Alloy Wire.

Rivet Wire, Brass

Wire for rivets for general engineering purposes has a copper content averaging about 63 percent, with lead content restricted to a maximum of about 0.05 percent. It is normally supplied in a lightly drawn condition and with a fine grain structure. This alloy has increased ductility, permitting the material to withstand severe deformation during head forming.

RJ

Designation for rubber insulated and jute covered cable.

RJFJ

Designation for rubber insulated cable with flat band armor.

RJIJ

Designation for rubber insulated cable with interlock armor.

RL

See Return Loss.

RLJFJ

Designation for rubber insulated cable with lead, jute, flat band armor and overall jute covering.

RLJWJ

Designation for rubber insulated cable with lead, jute, steel wire armor and overall jute covering.

RM

Designation for a UL-type rubber insulated multiple conductor with fibrous covering.

RML

Designation for a UL-type rubber insulated multiple conductor with lead covering.

RMS

See Root Mean Square.

RMS Current

See Root Mean Square Current.
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