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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

Strand Lay

The distance of advance of one strand of a spirally stranded conductor, in one turn, measured axially.

Strand Shield

A layer of semi-conducting material or tape applied directly over the stranded conductor of cables rated 2000 volts and higher. This reduces the possibility of high stress points occurring between the conductor and insulation.

Strand Wire

The zinc-coated steel wire for the manufacture of strand for guys, messengers and similar purposes has a heavier zinc coating than normal galvanized wire and is produced to more restricted mechanical properties, particularly with regard to tensile strength and elongation. Made from a variety of carbon steels ranging from about 0.10 to 0.75 percent carbon, in sizes usually from 1 to 5 mm in diameter.

Strand, Annular

A concentric conductor over a core. Used for large conductors (>1000 MCM @ 60 Hertz) to make use of skin effect. Core may be of rope, or twisted I-beam.

Strand, Bunch

1) A substrand for a rope-lay conductor. The wires in the substrand are stranded simultaneously with the same direction. 2) Small, circuit conductors for use in insulated applications where flexibility is desired.

Strand, Class

A system to indicate the type of stranding; the postscripts are alpha.

Strand, Combination

A concentric strand with an outer layer of a different size. Done to provide smoother outer surface. Wires are sized with ±5% tolerance from nominal.

Strand, Compact

A concentric stranding made to a specified diameter of 8-10 percent less than standard by using a smaller-than-normal closing die, and for larger sizes, preshaping the strands for the outer layer(s). This can be done in a buncher, strander, cabler or extruder.

Strand, Compound

A number of simple strands twisted together so that each simple strand, with the exception of the center one, has a helical form of predeter­mined lay ratio. When the number of simple strands exceeds four they are arranged in concentric layers. Alternate layers are usually laid in opposite directions.

Strand, Compressed

The making of a tight stranded conductor by using a small closing die at the buncher, cabler, strander or extruder. The resulting conductor diameter is about 97 percent of concentric stranding.

Strand, Concentric

A strand that has a core surrounded by one or more layers of helically laid wires of one size, with each layer increasing by six.

Strand, Herringbone Lay

When adjacent bunches have opposite direction of lay in a layer of a rope-lay cable.

Strand, Nonspecular

Stranding with a treated surface to reduce light reflection.

Strand, Regular Lay

Rope stranding with left-hand lay within the substrands and right-hand lay for the conductor.

Strand, Reverse Lay

A stranding with an alternate direction of lay for each layer.

Strand, Rope-Lay

A conductor with a lay-up of substrands. Substrand groups are bunched or concentric.

Strand, Sector

A stranded conductor formed into sectors of a circle to reduce the overall diameter of a cable.

Strand, Segmental

Stranding with sectors of the stranded conductor formed and insulated, one from the other, operated in parallel. Used to reduce AC resistance in single conductor cables.

Strand, Simple

A number of wires twisted together so that each wire, with the exception of the center one, has a helical form of predetermined lay ratio. Alternate layers are usually stranded in opposite directions.

Strand, Unidirectional

Stranding with the same direction of lay for all layers, but with different lay lengths.
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