Inspection and testing

Why is it important to perform initial verification on a new installation?

• It is the law

• To ensure the installation is safe before use

• For house insurance purposes

• To increase property value

Answer explanation

'Initial verification is carried out on a new installation before it is put into service. THE PURPOSE is to confirm by way of inspection and testing , during construction and on completion, that the installation complies with the design and construction aspects of BS 7671, in so far a reasonably practicable.' - Guidance note 3, page 21.

A client wants an additional 3 sockets in the Kitchen. What document should be used for record keeping?

• Multiple-signature Electrical Installation Certificate (EIC)

• Minor Electrical Installations Works Certificate (MEIWC)

• Electrical Installation Condition Report (EICR)

Answer explanation

This certificate is to be used for onl individual items of minor works that do not include the provision of a new circuit, such as an additional socket-outlet or lighting point to an existing circuit. FOR SEVERAL ITEMS OF MINOR WORKS, AN EIC SHOULD BE USED.

How frequently should a rented domestic property be periodically inspected and tested?

• Annualy

• 2 years

• 3 years

• 5 years

Answer explanation

Rented domestic properties should be periodically tested and inspected every 5 years. However, they should also receive a routine check annually.

Which of the following is a form of basic protection?

• Insulation of cable

• MCB

• RCBO

• Mains bonding

Which of the following are types of fault protection?

• RCD

• Protective equipotential bonding

• Barriers

• Double insulation

What is the maximum rating for an RCD used for protection against electric shock?

• 34mA

• 30mA

• 300mA

• 150mA

Answer explanation

'It should be confirmed that an RCD selected to provide additional protection has a rated residual operating current not exceeding 30mA and complies with all relevant standards.' - Wiring Regulation 415.1.1, Guidance note 3, page 37.

What is the maximum rating of an RCD used for protection against fire?

• 150mA

• 300mA

• 100mA

• 30mA

Which sign would be required for an earth bonding clamp used on a mains water pipe?

• 
• 
• 
• 

Answer explanation

BS 7671 permits the the notice to be provided by a clamp complying with BS 951.

A radial circuit of length 55m with 2.5mm line and 1.5mm protective conductor should have an expected R1 and R2 test result of...

• 1.07 Ohms

• 0.45 Ohms

• 0.85 Ohms

• 0.31 Ohms