Electrical Installation Inspection Quiz

Any addition to an existing installation should:

• have a similar wiring system to that used in the existing installation.

• be inspected and tested separate from the existing installation.

• not impair the safety of the existing installation.

• have its own energy meter separate from that of the existing installation.

Which of the following duties is ‘not’ the responsibility of the inspector?

• to carry out maintenance and repairs on the installation.

• to compare the test results with the design criteria.

• to advise on remedial works.

• to recommend the immediate isolation of defective parts.

Inspection of a fully enclosed domestic consumer unit would not need verification for:

• identification of conductors.

• rating and type of protective devices.

• insulation resistance between live conductors and earth.

• correct connection of single-pole devices.

Before commencing live tests and before energizing the installation, it is vital that you:

• Inform other people in the area.

• Disconnect the earth conductor from the Main Earth Terminal.

• Evacuate the area of the general public.

• Erect barriers around the testing area.

A room in which there is a 13 A socket outlet is to be converted into a bathroom. The socket outlet must be:

• removed from the room.

• moved to become a ceiling socket outlet.

• fitted with a switch.

• moved so as to be more than 3 m from the bath.

Where vertical trunking passes through floors internal fire resistant barriers must be:

• at maximum intervals of 3 m.

• only at the top of the trunking.

• at each floor level.

• mid-way between each floor.

Electrical test probes must comply with standards set by:

• BS 7671.

• GN 3.

• Guidance Note GS 38.

• BS EN 60598.

Which of the following IR values would require further investigation for a new installation?

• 100 MΩ.

• 1.5 MΩ.

• >200 MΩ.

• >999MΩ.

The minimum acceptable value of insulation resistance for a 650V discharge lighting circuit is:

• 0.25 MΩ.

• 0.5 MΩ.

• 1.0 MΩ.

• 2 MΩ.

As an alternative to the ‘D-Lok’, some instruments reduce the possibility of r.c.d. tripping during impedance testing by limiting the test current to:

• 15mA.

• 30mA.

• 100mA.

• 150mA.