Definitions

Question 1

Conductive Part

Answer 1

Any part that is capable of conducting electric current

Question 2

Exposed Conductive Part

Answer 2

Conductive part that
*can easily be touched &
*is not a live part under normal conditions, but can become live under fault conditions

Question 3

Extraneous Conductive Part

Answer 3

Conductive part that does not form part of the electrical installation

Question 4

Extraneous Conductive Part
Examples

Answer 4

• Structural metalwork of a building
  *items such as heating tubes and non-electrical apparatus electrically connected to them such as radiators & gas-fired/ coal-fired cooking appliances
  *Floors or walls made of conductive material

Question 5

Conductor

Answer 5

Material that is capable of conducting electric current

Question 6

Aerial Conductor

Answer 6

Conductor that is supported above the ground and that is (or its insulation) exposed direct to the open air

Question 7

Bonding Conductor

Answer 7

Conductor, including any clamp or terminal, that connects together exposed conductive parts, extraneous conductive parts or both exposed and extraneous conductive parts, with the object of bringing such parts to the same electrical potential.

Question 8

Earth Continuity Conductor

Answer 8

Conductor, including any clamp or terminal, that connects the consumer’s earth terminal to the exposed conductive parts of an installation for the purpose of earthing such parts and carrying fault currents.

Question 9

ECC

Answer 9

Earth Continuity Conductor

Question 10

Functional Earthing Conductor

Answer 10

Earthing conductor provided for functional earthing.

Question 11

Functional Bonding Conductor

Answer 11

Conductor provided for functional equipotential bonding.

Question 12

EMC

Answer 12

ElectroMagnetic Compatibility

Question 13

Protective Bonding Conductor

Answer 13

Protective conductor (PE) provided for protective equipotential bonding.

Question 14

PE

Answer 14

Protective Conductor
*Conductor provided for purposes of safety (protection against electric shock) and that also connects the supply earth to the consumer’s earth terminal.

Question 15

Protective Earth and Neutral conductor (PEN)

Answer 15

Conductor that forms part of a supply combining the functions of both protective earthing conductor and neutral conductor.
NOTE The conductor is also connected to the other earth electrodes and exposed conductive parts of the low-voltage supply.

Question 16

PEN

Answer 16

Protective Earth and Neutral conductor

Question 17

Protective Earthing Conductor

Answer 17

a Protective conductor provided for protective earthing.

Question 18

Consumer’s Earth Terminal

Answer 18

a Terminal that is effectively and permanently earthed, and to which the earth continuity conductor of an installation is permanently connected.

Question 19

Earth Fault Current

Answer 19

It is fault current that flows to earth.

Question 20

Earth Leakage Current

Answer 20

It is current that flows to earth in an electrically undamaged circuit.

Question 21

Fault Current

Answer 21

It is current that results from an insulation failure or from the bridging of insulation.

Question 22

Shock Current

Answer 22

It is current that passes through the body of a person or an animal and that has such a value (depending on frequency, harmonics and duration) that injury is likely to occur.

Question 23

Earth Electrode

Answer 23

It is one or more conductive parts that are embedded in the earth for the purpose of making effective electrical contact with the general mass of the earth.

Question 24

Earthing Arrangement

Answer 24

All electrical connections and devices involved in earthing of a system, an installation and equipment.

Question 25

Earthing Conductor

Answer 25

A conductor, including any clamp or terminal, by which the connection of the consumer's earth terminal or conductor to an earth electrode, or to the supplier's protective conductor, is made.

Question 26

Earthing Terminal

Answer 26

A Terminal fitted to equipment or to a device and intended for the electric connection with the earthing arrangement.

Question 27

Main Earthing Terminal (Busbar)

Answer 27

A Terminal (Busbar) that is part of the earthing arrangement of an installation that enables the electric connection of a number of conductors for earthing purposes.

Question 28

Protective Earthing

Answer 28

Earthing of a point or points in a system or in an installation or in equipment for purposes of safety.

Question 29

Earth Leakage Protection

Answer 29

A form of protection in which an earth leakage unit is used.

Question 30

Earth Leakage Unit

Answer 30

A device that is capable of detecting the flow of a specified or predetermined current from a circuit to earth, and of disconnecting, automatically and reliably, the affected circuit within a specified time when such current exceeds the specified or pre-determined value.

Question 31

Equipotential Bonding

Answer 31

A provision of electric connections between conductive parts intended to achieved substantially equal potential.

Question 32

Equipotential Bonding Terminal

Answer 32

A terminal fitted to equipment or to a device and intended for the electric connection with the equipotential bonding system.

Question 33

Protective Equipotential Bonding

Answer 33

A equipotential bonding for purposes of safety

Question 34

Wireway

Answer 34

Open or enclosed route or support such as a rack, tray, ladder, ducting, trunking, sleeving or conduit that is intended to contain conductors or cables NOTE - A wireway can consist of one or more separate wireway channels, each of which is intended for different services such as installation wiring and telecommunication wiring.

Question 35

Trunking

Answer 35

Closed enclosure that comprises a base with a removable cover that is intended to completely surround insulated conductors and cables in electrical installations and accommodate other electrical equipment, for example, in the case of power skirting.

Question 36

Flexible conduit

Answer 36

Tubing that is intended to house and to protect electric wiring and that is so designed that it is flexible.

Question 37

Ducting

Answer 37

Closed enclosure that allows insulated conductors and cables in electrical installations to be drawn in and to be replaced.

Question 38

Conduit

Answer 38

Pipe, usually of diameter not exceeding 50 mm, that allows conductors and cables in electrical installations to be drawn in and to be replaced.

Question 39

MCB

Answer 39

Miniature Circuit Breaker

Question 40

MCCB

Answer 40

Moulded Case Circuit Breaker