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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

Shed

In weaving, the height between the lower warp wires and the raised warp wires. Otherwise, the space between which the shuttle is projected from one side of the loom to the other.

Shedding Drum

Principal method of pulling wire through a Turks Head. It consists of a drum mounted on a gear reducer driven by a motor.

Shedding-Ring Reel

Take-up reel used to produce loose coil.

Sheet Metal Screw Wire

Wire produced to rigid specifications and often specially produced for a particular type and size of screw. Must be suitable for case hardening heat treatment of the screw and must have good torsional properties since the screw may have to cut its own head. See Screw Wire.

SHF

Designation for super high frequency.

Shield

A metallic layer placed around an insulated conductor or group of conductors to prevent electrostatic or electromagnetic interference between the enclosed wires and external fields. For communications cable, a covering that consists of any of the following: foil wrap, continuous tube or a metal wire braid applied over a conductor or cable. See Conductor Shield or Insulation Shield.

Shield (Electrostatic)

In cables, a metallic layer placed around a conductor or group of conductors to prevent electrostatic interference between the enclosed wires and external fields. See Insulation Shield.

Shield Conductor

See Conductor Shield.

Shield Coverage

The physical area of a cable that is actually covered by the shielding material. It is expressed as a percentage.

Shield Coverage Percent

Percentage of the surface area of cable core insulation covered by the shield. Also called Shield Percentage.

Shield Effectiveness

The relative ability of a shield to screen out undesirable signals.

Shield Line

A transmission line whose elements confine propagated radio waves to an essentially finite space inside a tabular conducting surface called the sheath, thus preventing the line from radiating radio waves.

Shield Percentage

See Shield Coverage Percent.

Shield, Braid

A shield of interwoven small wires.

Shield, Insulation

An electrically conducting layer to provide a smooth surface in intimate contact with the insulation outer surface. Used to eliminate electrostatic charges external to the shield, and to provide a fixed known path to ground. See Insulation Shield.

Shield, Tape

The insulation shielding system whose current carrying component is thin metallic tapes, now normally used in conjunction with a conducting layer of tapes or extruded polymer.

Shielded Cable

5,000V and above, enclosed in a nonmagnetic conducting envelope, so constructed that substantially every point on the insulation is at ground potential or some pre-determined potential with respect to ground. Can apply to multiple conductor cable in which each single conductor is shielded or to a multiple conductor cable where the overall assembly is shielded.

Shielded Conductor

An insulated conductor that has been shielded by a copper braid or tape, aluminum foil, copper foil or a semi-conductive vinyl. The purpose is to confine the electrical field.

Shielded Line

A transmission line whose elements confine propagated radio waves to an essentially finite space inside a tabular conducting surface called the sheath, thus preventing the line from radiating radio waves.

Shielded Multi-Conductor Cable

A cable with a multiplicity of conductors with a metallic or non-metallic shield over the cable core.
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