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ICEA. Insulated
Cable Engineers Association (formerly IPCEA). www.icea.net
IEC. International Electrotechnical Commission, similar
to the ISO in structure and scope.
IEEE. Institute of Electrical and Electronics
Engineers. www.ieee.org.
Impedance. The total opposition that
a circuit offers to the flow of alternating current or
any other varying current at a particular frequency. It
is a combination of resistance R and reactance X, measures
in ohms.
IMSA. International Municipal Signal
Association Specifications for Fire Alarm Cable.
Incoherent Source. (fiber optic) A light
source which emits wide, diffuse beams of light of many
wave lengths.
Index Matching Fluid. (fiber optic) Fluid
with refractive index same as fiber core; used to fill
air gap between fiber ends at connectors.
Induced Current. An electric current
set up in a circuit by cutting lines of force; a current
caused by electromagnetic induction.
Inductance. The property of a circuit
or circuit element that opposes a change in current flow,
thus causing current changes to lag behind voltage changes.
It is measured in henrys.
Inductive Coupling. Crosstalk resulting
from the action of the electromagnetic field of one conductor
on the other.
Insulation. A material having high resistance
to the flow of electric current. Often called a dielectric
in radio frequency cable.
Insulation Level-100%. Cable for use
on grounded systems or where the system is provided with
relay protection such that ground faults will be cleared
as rapidly as possible but in any case within one minute.
Insulation Level-133%. Cable for use
on grounded systems or where the faulted section will
be de-energized in a time not exceeding one hour.
Insulation Resistance (I.R.). That resistance
offered by an insulation to an impressed DC voltage, tending
to produce a leakage current through the insulation.
Insulation Thickness. The wall thickness
of the applied insulation.
Interaxial Spacing. 1) Center-to-center
conductor spacing in paired wire or 2) Center-to-center
spacing between conductors in a flat cable.
Interconnecting Cable. The wiring between
modules, between units, or the larger portions of a system.
Interference. Any undesired electrical
signal induced into a conductor by electrical or electromagnetic
means.
Interstices. Voids or valleys between
individual strands in a conductor or between insulated
conductors in a multiconductor cable.
Ionization. Generally the dissociation
of an atom or molecule into positive or negative ions
or electrons. Restrictively, that state of an insulator
whereby it facilitates the passage of current due to the
presence of charged particles usually induced artificially.
ISA. Instrument Society of America. www.isa.org
ISO. International Standards Organization.
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