level 2's - Earthing System

The earth fault loop path on a TNC-S type Earthing system will incorporate the supply company's

• Sheath of the supply cable

• Installation metalwork

• Neutral conductor

• Earth electrode of the incoming supply

In a PME system the neutral is kept at earth potential by

• The use of a cpc

• The use of an earth electrode

• Joining the earth and neutral at the consumer unit

• Earthing it at many points along its length

The image shows an example of which type of earthing arrangement?

• TN-S

• TN-CS

• TN-C

• TT

The image shows an example of which type of earthing arrangement?

• TN-S

• TN-CS

• TN-C

• TT

What does the list below describe? 1. The circuit protective conductor 2. The consumer’s Earthing terminal 3. The metallic return path 4. The path through the earthed neutral point of the transformer 5. The transformer winding 6. The line conductor from the transformer to the point of fault

• Earth fault current

• Earth electrode network

• Earth fault loop

• Earthed concentric wiring

Which of the following systems has all exposed conductive parts connected to an earth electrode?

• IT system

• TN-S system

• TT system

• TN-C-S system

The image shows an example of which type of earthing arrangement?

• TN-S

• TN-C-S

• TN-C

• TT

The image shows an example of which type of earthing arrangement?

• TN-S

• TN-CS

• TN-C

• TT

The image shows an example of which type of earthing arrangement?

• TN-S

• TN-CS

• TN-C

• TT

Protective multiple Earthing (PME) is an arrangement

• Where a conductor combines the function of both protective conductor and phase conductor

• Where the supply neutral conductor is used to connect the Earthing conductor of an installation with earth

• Where a conductor combines the function of both protective conductor and neutral conductor

• In which a number of electrical connections maintains various exposed conductive parts at the same potential