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Abrasion Resistance. Ability of a wire, cable or material
to resist surface wear.
Accelerated Life Test. An accelerated
lifetest is a test in which certain factors such as voltage,
temperature, etc, to which a cable is subjected are increased
in magnitude above normal operating values to obtain observable
deterioration in a reasonable period of time and thereby
afford some measure of the probable cable life under operating
voltage, temperature, etc.
A.C. Resistance. The total resistance
offered by a device in an alternating current circuit
due to inductive and capacitive effects, as well as the
direct current resistance.
Active Current. In an alternating current,
a component in phase with the voltage; the working component
as distinguished from the idle or wattless component.
Active Pressure. In an A.C. circuit,
the pressure which produces a current, as distinguished
from the voltage impressed upon the circuit.
Admittance. The measure of the ease with
which an alternating current flows in a circuit. The reciprocal
of impedance.
Adhesion. The state in which two surfaces
are held together by interfacial forces which may be chemical
or mechanical in nature.
Aerial Cable. A cable suspended in the
air on poles or other overhead structure.
Aging. The irreversible change in properties
or appearance of a material with time and under specific
conditions (usually accelerated representations of environmental
states, such as high temperature, oxygen or other various
conditions).
Alloy. A metal formed by combining two
or more different metals to obtain desirable properties.
Alternating Current (AC). Electric current
that continually reverses its direction. It is expressed
in cycles per second (hertz or Hz).
Alternating Voltage. The voltage developed
across a resistance or impedance through which alternating
current is flowing.
Ambient Temperature. Any all encompassing
temperature within a given area.
Ampacity. The maximum current an insulated
wire or cable can safely carry without exceeding either
the insulation or jacket material limitations. (Same as
Current Carrying Ampacity.)
Ampere. The unit of current. One ampere
is the current flowing through one ohm of resistance at
one volt potential.
Ampere’s Law. The magnetic intensity
at any point near a current carrying conductor can be
computed on the assumption that each infinitesimal length
of the conductor produces at the point of an infinitesimal
magnetic density. The resulting magnetic intensity at
the point is the vector sum of the contributions of all
the elements of the conductor.
Anneal. Relief of mechanical stress through
heat and gradual cooling. Annealing copper renders it
less brittle.
Annular Conductor. A number of wires
stranded in three reversed concentric layers around a
core.
Anode. The electrode through which a
direct current enters the liquid, gas or other discrete
part of an electrical circuit; the positively charged
pole of an electrochemical cell.
ANSI. The American National Standards
Institute. (www.ansi.org)
ANSI and the Instrument Society of America (ISA) have
established stringent standards of calibration to govern
the specification and manufacture of thermocouple extension
wire & cable. Multi/Cable Corporation fully complies
with these standards.
Anti-Oxidant. A substance which prevents
or slows down oxygen decomposition (oxidation) or a material
exposed to air.
Anti-Ozonant. A substance which prevents
or slows down material degeneration due to ozone reaction.
Arc. 1) A Luminous glow formed by the
flow of electric current through ionized air, gas or vapor
between separated electrodes or contacts. 2) A portion
of the circumference of a circle.
Arc Over Voltage. The minimum voltage
required to create an arc between electrodes separated
by a gas or liquid insulation under specified conditions.
Arc Resistance. The time required for
an arc to establish a conductive path in a material.
Area of Conductor. The size of a conductor
cross-section, measured in circular mils, square inches,
etc.
Attenuation. Power loss in an electrical
system. In cables, generally expressed in db per unit
length, usually 1000 ft.
Audio Frequency. The range of frequencies
audible to the human ear. Usually 20-20,000 Hz.
AWG. Abbreviation for American Wire Gauge.
Based on a circular mil system. 1 mil equals .001 inch.
AWM. UL Designation for appliance wiring
material. Multi/Cable has several AWM styles to choose
from.
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