Design 1

Which type of earthing arrangement uses a PEN conductor

• TN-C

• TN-C-S

• TN-S

• TT

Which type of earthing arrangement uses the sheath of the supply cable to provide an earthing point to an installation?

• TN-C

• TN-C-S

• TN-S

• TT

Which kind of earthing arrangement relies on an earth electrode installed by the consumer

• TN-C

• TN-C-S

• TN-S

• TT

What is the maximum Ze that the supplier should provide for a TN-C-S system

What is the maximum Ze that a supplier should provide for a TN-S system

When installing an earth electrode, at what resistance is it declared unstable?

A domestic installation most likely has a..

• single phase, two wire supply

• single phase, three wire supply

• three phase, three wire supply

• three phase, four wire supply

An industrial installation most likely has a...

• single phase, two wire supply

• single phase, three wire supply

• three phase, three wire supply

• three phase, four wire supply

when working out the Voltage of a three phase system, we divide the line to line 400v voltage by?

• 1.7

• 3

• 1.5

What does 'U' symbol mean?

• Line to Line voltage

• Line to neutral voltage

• Line to Earth voltage

• Neutral to Earth Voltage