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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

Energize

To apply rated voltage to a circuit or device in order to activate it.

Energy

The capacity for performing work.

Energy of a Charge

E = ½ QV, given in ergs when the charge Q, and the potential, V, are in electrostatic units.

English Legal Standard

See British Standard Wire Gauge.

Entrance Facility, Telecommunications

An entrance to a building for both public and private network service cables (including antennae) including the entrance point at the building wall and continuing to the entrance room or space.

Entrance Point, Telecommunications

The point of emergence of telecommunications conductors through an exterior wall, a concrete floor slab, or from a rigid metal conduit or intermediate metal conduit.

Entrance Room or Space, Telecommunications

A space in which the joining of inter- or intra-building telecommunications backbone facilities takes place. An entrance room may also serve as an equipment room.

Environmental Cracking

Environmental Cracking

EO

Designation for elevator lighting and control cable that has rubber insulation, cotton braid, neoprene jacket. May have steel supporting strand in center, 300V.

EP

Designations for synthetic rubber based upon ethylene-propylene hydrocarbon.

EPA

Designation for Environmental Protection Agency, the U.S. federal regulatory agency responsible for keeping and improving the quality of the living environment, mainly air and water.

EPCV

See Rubber, EPCV.

EPDM

1.)Designations for synthetic rubber based upon ethylene-propylene hydrocarbon.

EPM

Designations for synthetic rubber based upon ethylene-propylene hydrocarbon.

EPOS

Designation for electronic point-of-sale.

Epoxy Resins

A thermosetting resin based on the reactivity of the epoxide group.These straight-chain resins can be used for applications such as potting connectors and some in-field splicing kits. They were once used as enamels for magnet wire. The use of expoxies was at a peak when the transformer industry was using materials such as askarek in transformers.

EPR

Designations for synthetic rubber based upon ethylene-propylene hydrocarbon.

Epsomite

A naturally occurring form of magnesium sulfate that is a source of magnesium salts. This water-soluble mineral is better known in most households as Epsom salt.

Equal Load Sharing

An even distribution of current between the parallel cables in a power circuit.

Equilay

More than one layer of helically laid wires with the direction of lay reversed for successive layers, but with the length of lay the same for each layer.
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