Page 257 - belden

TE CH N I C A L INF O RM A T I O N 257

Glossary (continued)

Electromagnetic Coupling — The transfer of Flamarrest® — Belden trademark for a plenum Hook-Up Wire — Single conductor wire
energy by means of a varying magnetic field. grade chloride-based thermoplastic jacketing with various types of insulation.
Inductive coupling. material with low smoke and low flame spread
properties; more flexible than traditional Impedance Match — A condition whereby
Energy Dissipation — Loss of energy from the impedance of a particular circuit, cable or
fluorocopolymer jacket materials. Cables
a system due to the conversion of work jacketed with Flamarrest meet the ANSI/ NFPA component is the same as the impedance of the
energy into an undesirable form, usually heat. circuit, cable or device to which it is connected.
Standard 2621-985 (UL-910) Flame Test.
Dissipation of electrical energy occurs when
current flows through a resistance. Flame Resistance — The ability of a material Impedance Matching Stub — A section of
to resist the spread of an applied flame. transmission line or pair of conductors cut to
EPDM — Ethylene-propylene-diene monomer match the impedance of a load. Also called
rubber. A chemically cross-linked elastomer Flex Life — The qualification of the number matching stub.
with good electrical insulating properties of times a cable may bend before breaking.
and excellent flexibility at high and low Insulation Stress — The molecule separation
temperatures. It has good insulation resistance Flexibility — The ability of a cable to bend pressure caused by a potential difference
and dielectric strength, as well as excellent in a short radius. The ability of a cable to across an insulator. The practical stress on
abrasion resistance and mechanical properties. lay flat or conform to a surface as with insulation is expressed in volts per mil.
microphone cables.
EPDM has better cut-through resistance than Interference — Disturbances of an electrical
silicone rubber, which it replaces in some Fluorocopolymer — Generic term for PVDF. or electromagnetic nature that introduce
applications. undesirable responses into other electronic
Foam Polyethylene — Expanded or “foam” equipment.
Equilay — More than one layer of helically laid polyethylene, consists of individual closed
wires with the length of the lay in each layer. cells of inert gas suspended in a polyethylene Ionization — The formation of ions. Ions are
medium, resulting in a desirable reduction of produced when polar compounds are dissolved
Expanded Polyethylene — Expanded or
“foam” polyethylene, consists of individual the dielectric constant. in a solvent and when a liquid, gas, or solid
closed cells of inert gas suspended in a FR-TPE — Flame retarded thermoplastic is caused to lose or gain electrons due to the
polyethylene medium, resulting in a desirable elastomer is a rubber-like plastic that has passage of an electric current.
reduction of the dielectric constant. properties similar to rubber yet is processed Ionization Voltage — The potential at which
as a thermoplastic. It is used as the insulation a material ionizes. The potential at which an
Extruded Cable — Conductors are
simultaneously insulated and the cable is and jacket in an all TPE constructions which atom gives up an electron.
formed by a continuous extrusion process. meets UL 13 and 1277 industrial cable Jacket — Pertaining to wire and cable, the
requirements. It has good electrical properties,
FEP — Fluorinated ethylene-propylene. abrasion resistance, colorability, and flame outer protective covering that may also
A thermoplastic material with good electrical retardance. This compound is ideal for cold provide additional insulation.
insulating properties and chemical and weather applications. Matte Finish PVC — A special formulation
heat resistance. of PVC which very closely looks and feels
Ground Conductor — A conductor in a
FEXT — Far End Crosstalk. Crosstalk induced on transmission cable or line that is grounded. like rubber. See Belflex®.
the pairs, measured at the far end of the cable, Mutual Capacitance — Effective capacitance
referenced to the near end input signal. Usually Haloarrest® — Haloarrest is a non-halogenated between two conductors when the effects of
expressed in decibels (dB). flame retarding thermoplastic polyolefin with the other conductors and shield, if present,
excellent low smoke and flame properties.
Fiber — A single, separate optical transmission It is often used as a jacket over the XLP are removed.
element characterized by core and cladding. insulated singles (non-XHHW), and the entire Neoprene — A synthetic rubber with good
construction meets the UL 13 and 1277 resistance to oil, chemical, and flame. Also
Fiber Optics — Light transmission through specifications as a non-halogenated PLTC/
optical fibers for communication and signaling. called polychloroprene.
TC cable. Haloarrest meets the European
A technology that transmits information Specifications on acid gas evolution and NEXT — Near-end Crosstalk. Crosstalk induced
as light pulses along a glass or plastic fiber.
% halogen content. This jacket can also be on the pairs, measured at the end near the
Optical fiber carries much more information used with XHHW conductors for wet ratings. transmitter. Usually expressed in decibels (dB).
than conventional copper wire and is generally
not subject to interference. Most telephone HaloarrestXLink™ — HaloarrestXLink NFPA — National Fire Protection Association.
company long-distance lines are optical fiber. is a non-halogenated flame retarding Noise — In a cable or circuit, any extraneous
thermoset compound with excellent low
Field — An area through which electric and/or smoke and flame properties. The highly signal which tends to interfere with the
magnetic lines of force pass. signal normally present in or passing through
oil-resistant material is used as a jacket
the system.
Filled — Cables that are gel filled to improve material in control, communication, and
waterblocking properties. instrumentation applications and is suited Non-Plenum — A description for a cable that
for indoor and outdoor applications. The does not meet the requirements of NFPA 262
Fillers — Non-conducting components cabled entire construction meets the UL 13 and (UL 910) CMP flame test. Such a cable cannot
with the insulated conductors or optical fibers 1277 specifications as a non-halogenated be installed in an area that is used for air
to impart roundness and/or tensile strength to PLTC/TC cable. HaloarrestXLink meets the return (plenum).
the cable. European Specifications on acid gas
evolution and % halogen content. Nylon — An abrasion-resistant thermoplastic Technical Information
with good chemical resistance.

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