GLOSSARY OF TERMS

 

A

 

 

 

 

Ampere

 

AC

Alternating Current

 

ABRASION :

Ability of a Wire or Cable to resist surface wear.

 

RESISTANCE

 

 

 

 

ALLOY

A Combination of two or more different polymers or metal. Usually combined to

 

 

Make use of different properties of each polymer or metal.

 

ACCELERATED

A test that simulates long time environmental condition in a relatively short time.

 

AGEING

 

 

 

 

AMBIENT

Condition existing at a test or operating location prior to to energizing

 

 

equipment’s.

 

ALTERNATING

Electric Current that alternates or reverses polarity continuously.  The  numbers

 

CURRENT[A.C.]

Of alternations per seconds are called as "Cycles" [Hertz or Hz.]

 

AMPERE

A standard unit of current and is defined as the amount of current that flows when

 

 

One volt of elf is applied across one ohm of resistance. An Ampere of current is

 

 

Produced by one coulomb of charge passing a point in one second.

 

ANNEAL

To soften and relieve strains in any solid material such as metal by heating to

 

 

Just below its melting point and then slowly cooling it. Annealing generally

 

 

lowers the tensile strength of the material, while improving its elongation and

 

 

Flexibility.

 

BENDING RADIUS

Radius of curvature that a cable can bend without any adverse effect.

 

BREAKDOWN

The Voltage at which the insulation between two conductor or one conductor &

 

VOLTAGE

the earth will fail and allow the electricity to conduct energy from one point to

 

 

Another.

 

BUNCH STRAND

Conductors twisted together with same lay and direction.

 

CAPACITIVE

The opposition of alternating current due to capacitance of a capacitor or cable. It

 

REACTANCE

Is measured in Ohms.

 

CAPACITANCE

The ability of dielectric or insulation material between the conductors to store

 

 

Energy when a difference of potential exists between conductors. The unit of

 

 

Capacitance is Farads. Cable Capacitance is usually measured in Pico farads [pF]

 

 

Per MT.

 

COLOR CODE

A system of different colors used to identify the components of cables such as

 

 

Conductor or group of conductors.

 

CONCENTRIC

A group of uninsulated wired twisted together and containing a center core with

 

STRANDING

the subsequent layers spirally wrapped around the core with alternating lay

 

 

Direction to form a single conductor.

 

CONDUCTIVITY

The ability of a material to allow electrons to flow, measured by current per unit

 

 

Of voltage applied. It is the reciprocal of resistivity.

 

CONDUIT

A tube of metal or Plastic through which wire or cable can be run, used to protect

 


CONDUCTOR

A Substance, usually metal Copper or Aluminum, used to transfer electrical

 

Energy from point to point.

CORD

A very flexible insulated Cable.

CURRENT LOOP

A two wire transmit/receive interface.

D C

Direct Current.

DIRECT CURRENT

Electric Current that flows in one direction only.

DIELECTRIC

An Insulating [none conducting] medium when used in signal carrying design.

DIELECTRIC LOSS

The Power dissipation in a dielectric as the result of friction produced by

 

Molecular motion when an alternating field is applied.

DIELECTRIC

The voltage which an insulation can withstand before it break down.

STRENGTH

 

DIELECTRIC

A number which indicates the quality of a material to resist holding an electrical

 

Charge when placed between two conductors. It is based on a vacuum, which has

 

Dielectric constant of 1.

CONSTANT

Motion when an alternating field is applied.

ELECTROSTATIC

Pertaining to static electricity, or electricity at rest.

EMF

Electromotive Force [Voltage]

ENERGY

The Capacity of doing work.

ENERGY

Loss of energy from a system due to conversion of work energy into undesirable

DISSIPATION

Form usually heat. Dissipation of Electric Energy occurs when current flows

 

Through a resistance.

ELONGATION

The increase in length of a wire or cable caused by longitudinal tension.

FARADS

A unit of capacity that will store one coulomb of electrical charge when one volt

 

Of electrical pressure is applied.

FERROUS

Composed of and/or contain iron. A ferrous metal exhibits magnetic

 

Characteristics.

FLAME RESISTANCE

The ability of a material not to fuel a flame once the source of heat is removed.

FLEXIBILITY :

The ability of a cable to bend in a short radius.

FRLS

Flame Retardant Low Smoke.

FREQUENCY

The number of times a periodic actions occurs in one second.

GROUND

An electrical connection between the circuit and earth.

I

Symbol used to designate current.


IMPEDANCE

The total opposition that a circuit offers to flow the alternating current or any

 

Other varying current at a particular frequency.

INDUCTANCE

The property of a wire which store electrical current in a magnetic field around

 

The wire. It is measured in Henrys.

INSULATION

A material having good dielectric properties which is used to separate the

 

Conductor from surroundings.

IR DROP

The designation of voltage drop in term of current and resistance.

LAY

The length measured along the axis of wire required for a single strand to make

 

One complete turn about the axis of conductor or cable. In a twisted pair cable,

 

the lay length is the distance it takes for two wires to completely twist around

 

Each other.

LAY DIRECTION

The direction of progressive spiral twist in a cable while looking along the axis of

 

The cable away from the observer. The lay direction can be left or right.

LEAKAGE

The undesirable passage of current over the surface of or through an insulator.

KILO

One Thousand [ 10 3]

KV

Kilo Volts [1000 Volts.]

KVA

Kilo Volt Ampere.

KW

Kilo Watt.

mA

Milli Ampere.

MEGA

Prefix Meaning Million.

MHO

Unit of Conductance equal to reciprocal of unit of resistance [Ohm].

MICRO

Prefix meaning of One - millionth [ 10 -6 ]

MICRON

Millionth of a Meter.

MIL

A unit of length equal to one thousand of an Inch.

MILLI

Prefix meaning One-thousandth [ 10 -3 ].

mV

Milli Volt.

mW

Milli Watt.

NANO

One Billionth.

NOISE

 In a Cable or circuit, any extraneous signal which tends to interfere with the

 

Signal normally present in or passing through the system.

PEAK

The maximum instantaneous value of a varying current or voltage.


POWER

The amount of work per unit of time. It is expressed in Watts.

POWER LOSS

The difference between the total power delivered to a circuit or cable and power

 

Delivered by the circuit or cable.

RATED

The maximum temperature at which an electric component can operate for

TEMPERATURE

Extended period without loss of its basic properties.

RATED VOLTAGE

The maximum voltage at which an electric component can operate for extended

 

Period without undue deration or safety hazards.

REACTANCE

A measure of combined effect of capacitance and inductance on an alternating

 

Current. The amount of such opposition varies with the frequency of current.

RESISTANCE [DC]

The opposition offered by a material to flow of current. It is expressed in Ohms.

RESISTANCE [AC]

The total opposition that a circuit offers to the flow of alternating current. It is the

 

Total effect of resistance, Inductance & Capacitance. It is expressed in Ohms.

RMS

Root Mean Square.

PVC

Poly Vinyl Chloride.

STRAND

A Single Uninsulated Wire.

STRANDED

A Conductor composed of groups of uninsulated wires.

CONDUCTOR

 

SHEATH

Pertaining to Twisted Insulated Conductors, the outer protection covering.

THERMAL RATING

The Temperature in which a material will perform its function without undue degradation.

TENSILE STRENGTH

:    The pull stress required to break a bare wire or insulation.

TRANSMISSION LINE

:    An arrangement of two or more conductors used to transfer signal energy from

 

One location to another.

V

Volts.

VOLTAGE

Electrical Potential or electromotive force expressed in volts.

VOLTAGE DROP

:    A Voltage loss occurring between any two points in a power transmission line.

 

Such drop, Resistance, Reactance & leakage of the line.

VOLTAGE RATING

:    The highest rating that may be continuously applied to a cable construction in

 

Conformance with the standard or specification.

VSWR

Abbreviation for voltage standing wave ratio. It is the ratio of transferred signal

 

voltage as compared to reflected signal voltage measured along with the length of

 

Transmission line.

WALL THICKNESS

The Thickness of Insulation or Sheath.

WATT

The unit of electrical Power.