18 April 2019

Electrical Important Terminology : Low Voltage, Medium Voltage, High Voltage

There are some importance Electrical definitions are given as per IE RULE 1956. All these definitions are given as per IE rules 1956.

Apparatus

  • The apparatus means electrical apparatus including all machines its accessories in which conductors are used.

Bare conductor

  • It is a conductor in which insulation is not provided.

Cable

  • The cable means insulated single conductor / two conductors / more than two conductor which are laid together in which overall mechanical protection cover for all conductor may be provided or not.

Flexible cable

  • It is a cable which consists of one or more core each formed by group of wires such that it is afford to flexibility.

Circuit

  • It is arrangement of conductors, active and passive element for the purpose of conveying energy.

Concentric cable

  • It is a composite cable in which inner conductor is insulated and one or more outer conductors are insulated from one another and arranged over the inner conductor.

Conductor

  • It is any wire, cable, bar or plate used for conducting energy and arranged in the electrically connected system.

Conduit

  • It is a rigid of flexible metallic / non – metallic tube in which cable / cables may be drawn for the purpose of mechanical protection.

Cut out

  • The function of the cut out is to automatic interrupt the transmission energy through a conductor when current passes rises above its predetermined value.

Dead

  • The word dead in the electrical system means at earth potential / disconnected from live system.

Earthed

  • Any equipment / metal part is connected to general mass of earth in such manner as to ensure at all time discharge of energy without any danger.

Guarded

  • The word Guarded means shielded, covered or protected by suitable casing or metal screen.

Installation

  • Any composite electrical unit used for the purpose of generating, transforming, transmitting or distributing energy.

Lighting arrestor

  • It is an electrical device which used for diverting or earths any electrical surge of excessive high amplitude and restoring itself after original operation condition.

Linked switch

  • It is a switch in which all poles are mechanically linked to operate it simultaneously.

Neutral conductor

  • It is a conductor of multi wire system and its voltage is intermediates between the voltages of other conductors of the system. 
  • It also acts as return conductor in the single phase supply system.

Ohm

  • It is unit of resistance. 
  • It is the resistance offered to an direct current by a column of mercury at the temperature of melting ice 14.45 gram of unit cross sectional area and length of 106.3 centimeter.

Overhead line

  • It is any electrical supplying line which is placed above the ground and in the open air ( excluding rail line ).

Span

  • It is defined as the horizontal distance between two adjacent supports in the transmission line.

Switch

  • It is manually operating device used for opening or closing of electrical connection of circuit.

Switchgear

  • It includes switches, circuit breakers, cut out and other electrical devices for operation, regulation and controlling of circuits.

Volt

  • It is unit of electro motive force. 
  • It is electrical pressure steadily applied between two points of conductor having resistance of one ohm produces current of one ampere.

Voltage

  • It is defined as the potential difference between two conductors or between conductor and earth.

Low voltage

  • It is voltage which does not exceed 250 V under normal operating condition. However the percentage variation is allowed.

Medium voltage

  • It is voltage which does not exceed 650 V under normal operating condition. However the percentage variation is allowed.

High voltage

  • It is voltage which does not exceed 33 kV under normal operating condition. However the percentage variation is allowed.

Extra High voltage

  • It is voltage which exceed above 33 kV under normal operating condition. However the percentage variation is allowed.
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