OSG gives the maximum stable value of Ze for a TT installation as

• 100 ohms

• 21 ohms

• 0.8 ohms

• 200 ohms

Safe isolation should be carried out by

• A Skilled person

• An engineer

• The home owner

• The client

Which type of earthing system relies on a separately supplied earth, usually the sheathing on the cable

• TT

• TN-S

• TN-C-S

• IT

Which of the following would not be one of the human senses to use during the

initial verification of an addition to a lighting circuit:

• smell

• taste

• sight

• hearing

The person carrying out inspection and testing must have

• An On site guide

• A Megger

• Sound knowledge and experience relevant to the installation being inspected

• A decent van

The top surface of a consumer unit should be protected from ingress of dust to a standard of

• IP4X

• IP2X

• IPX4

• IPX2

A visual inspection is necessary

before testing to check whether

• The ZS is within the maximum allowed

• Switch gear is accessible

• The insulation resistance is acceptable

• RCD testing is acceptable

Which of the following is not permitted for use as an earth electrode

• Multiple earth rods

• Earth Rod

• Metal water mains pipes

• Earth plates

Which one of the following does not need to be checked for compliance during the visual inspection of an installation

• Routing of cables in safe zones

• Connection of single pole devices in line conductors only

• Presence of fire barriers

• End to End test on a Ring circuit

The purpose of the test button of a residual current device is to check the

• Earth electrode resistance

• Continuity of the earthing conductor

• Mechanical operation of the RCD

• Earth fault loop impedance