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EMI - abbreviation for Electromagnetic Interference.

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

EPDM - Ethylene-propylene-diene monomer rubber. A chemically cross-linked elastomer with good electrical insulating properties and excellent flexibility at high and low temperatures. It has good insulation resistance and dielectric strength, as well as excellent abrasion resistance and mechanical properties. EPDM has better cut-through resistance than Silicone rubber, which it replaces in some applications.

Equilay - more than one layer of helically laid wire with the direction of lay reversed for successive layers, both with the length of lay the same for each layer.

Etched Wire - a process applied to fluroplastic wire in which the wire is passed through a sodium bath to create a rough surface to allow epoxy resin to bond the fluroplastic.

ETFE - Ethylene tetrafluoroethylene (Teflon)

Ethylene Propylene Rubber (EPR) - an ozone resistance rubber consisting primarily of ethylene propylene copolymer (EPM) or ethylene propylene diene terpolymer (EPDM).

ETPC - abbreviation for electrolytic tough pitch copper. It has a minimum conductivity of 99.9%

Expanded Polyethylene - Expanded or "foam" polyethylene, consists of individual closed cells of inert gas suspended in a polyethylene medium, resulting in a desirable reduction of the dielectric constant.

External interference - the effects of electrical waves or fields which cause sounds other than the desired signal (static).

Extrusion - the process of continuously forcing both a plastic or elastomer and a conductor core through a die, thereby applying a continuous coating of insulation or jacket to the core or conductor.