Electrical Inspection & Testing Unit 112

Which document is statutory?

• BS 7671

• EAWR

• GN3

• GS38

Answer explanation

The statutory document is EAWR, as it is a legal requirement for electrical installations in the UK.

A test of prospective fault current at the origin of an installation has been carried out. What should the result be compared with?

• The breaking capacity of the main protective device

• The breaking capacity of the main isolator

• The nominal current rating of the main protective device

• The nominal current rating of the main isolator

Answer explanation

The result of the test should be compared with the breaking capacity of the main protective device, as it determines the ability to handle fault current.

What does HSE guidance recommend for detachable test leads used on a single instrument?

• They must be over 3 m long

• They must be at least 2.5 mm² csa

• They must only have single insulation

• They must be different colours

Answer explanation

HSE guidance recommends detachable test leads with single insulation for a single instrument.

Who, under the Electricity at Work Regulations, should the inspector ensure the safety of?

• Themselves

• The client and others

• Both themselves and others

• Staff in other buildings owned by the client

Answer explanation

The inspector should ensure the safety of both themselves and others under the Electricity at Work Regulations.

The implications of not carrying out a safe isolation could lead to prosecution. Which statutory legislation would be used for this purpose?

• COSHH

• ESCQR

• EAWR

• BS 7671

Answer explanation

Not carrying out safe isolation can lead to prosecution under the statutory legislation EAWR. It is important to comply with this regulation to ensure safety and avoid legal consequences.

What would be the insulation resistance of cable, when the length is doubled, if the original value is 10 MΩ?

• 2.5 MΩ

• 5 MΩ

• 10 MΩ

• 20 MΩ

Answer explanation

When the length of the cable is doubled, the insulation resistance is halved. Therefore, the insulation resistance would be 5 MΩ, which is the correct choice.

Which document should the customer be provided with after the installation of a new shower circuit?

• An Electrical Installation Certificate

• An Electrical Installation Condition Report

• A Minor Electrical Installation Works Certificate

• A copy of the test equipment calibration certificate

Answer explanation

After the installation of a new shower circuit, the customer should be provided with an Electrical Installation Certificate, which confirms the safety and compliance of the installation.

What could not be verified by the use of a rotating disc type instrument?

• Correct labelling/identification of plain conductors

• Phase sequence at the origin of the supply to an installation

• Disconnection of protective devices with the specified times

• Direction of rotation at the supply terminals of a three phase motor

Answer explanation

The rotating disc type instrument cannot verify the disconnection of protective devices with the specified times.

What is the purpose of operating the integral test button of an RCD?

• To confirm the function of the mechanical parts

• To ensure it disconnects at the specified fault currents

• To isolate the RCD prior to carrying out instrument tests

• To reset the RCD following the required instrument tests

Answer explanation

The purpose of operating the integral test button of an RCD is to confirm the function of the mechanical parts.

How many keys must be available for a lock that is used to securely isolate a protective device?

• 1

• 2

• 3

• 4

Answer explanation

Only one key must be available for a lock that is used to securely isolate a protective device. This ensures maximum security and control.