4. Initial Verification of Electrical Installations

What is the main purpose of an Initial Verification?

• To complete the testing and issue an Electrical Installation Certificate.

• To make a judgement that the installation is safe for continued use.

• To confirm an installation is safe to be put into service.

• To ensure all testing has been carried out.

What situation requires the issuing of a Minor Electrical Installation Works Certificate?

• An additional lighting circuit has been installed.

• Changing a consumer unit and protective devices.

• Upgrading the cable and circuit breaker for a shower circuit.

• Additional socket-outlets added to an existing ring final circuit.

Which statutory document contains specific information relevant to Initial Verification?

• The Electricity at Work Regulations.

• Health and Safety guidance GS38.

• The Health and Safety at Work Act.

• BS 7671, Requirements for Electrical Installations.

What is the minimum voltage which requires the test leads and probes to comply with GS38?

• 25 V AC.

• 50 V AC.

• 120 V AC.

• 150 V AC.

How many voltage measurements are required to confirm that a three-phase four-wire installation is safely isolated?

• 3

• 6

• 9

• 10

What precaution is required before carrying out a test of external earth fault loop impedance (Zₑ) so as to avoid danger to users of an installation?

• Lock off the supply.

• Use insulated screwdrivers.

• Warn the occupier of the premises.

• Disconnect the main protective bonding conductors.

Why does BS 7671 require inspection to be carried out before testing?

• To confirm the installers have installed as per the job specification.

• To confirm all the equipment is connected to the installation will work.

• To confirm the installation is complete and it is safe to commence testing.

• To confirm the Earthing Conductor is connected and it is safe to commence testing.

Which situation will not require a label stating ‘Safety Electrical Connection – Do Not remove’?

• Connecting a bonding conductor to a metallic installation gas pipe.

• An Earthing conductor connected to an installation earth electrode.

• A supplementary bonding conductor connected to a metallic water pipe.

• The connection to a Main Earthing Terminal within a consumer unit.

What must be checked when inspecting a consumer unit for compliance with Basic Protection requirements?

• All cable terminations are tight.

• Enclosures meet the IP requirements.

• Live conductors are correctly identified.

• Protective devices are the correct rating.

Which two senses are used when inspecting the terminations at a newly installed motor?

• Sight and hearing.

• Sight and smell.

• Touch and smell.

• Touch and sight.