012 Sample Evolve questions (B)

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

Under the Electricity at Work Regulations, the inspector is responsible for ensuring the safety of both themselves and others. This includes taking precautions to protect everyone involved.

Where is the correct location to test that a lighting circuit is isolated and safe to work on?

• At the supply intake position.

• On the supply side of the circuit protective device.

• At any convenient luminaire.

• On the load side of the circuit protective device.

Answer explanation

The correct location to test for isolation is on the load side of the circuit protective device. This ensures that the circuit is completely de-energized and safe to work on, as testing at other points may still have live voltage.

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 1 key is needed for a lock to securely isolate a protective device. This single key can control access, ensuring that the device remains protected and isolated when not in use.

Why is safe isolation carried out?

• To allow earth fault loop impedance testing.

• To allow phase sequencing testing.

• To stop RCDs operating when testing.

• To stop contact with live parts.

Answer explanation

Safe isolation is carried out primarily to stop contact with live parts, ensuring the safety of personnel during electrical testing and maintenance.

Testing is to be carried out at the origin of a large, unoccupied building which has a standby generator. What must be done before tests are carried out?

• Check the operation of the standby supply.

• All main protective bonding must be disconnected.

• Temporary lighting must be installed for all escape routes.

• The standby supplies must be isolated to ensure safe testing.

Answer explanation

Before testing, it is crucial to isolate the standby supplies to ensure safe testing. This prevents any accidental activation of the generator during the testing process, ensuring the safety of personnel and equipment.

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

The Electricity at Work Regulations (EAWR) mandate safe isolation procedures. Failure to comply can lead to prosecution, making EAWR the relevant statutory legislation in this context.

Which document is statutory?

• BS 7671.

• EAWR.

• GN3.

• GS38.

Answer explanation

The EAWR (Electricity at Work Regulations) is a statutory document that outlines legal requirements for electrical safety in the workplace, making it the correct choice. The other options are guidelines or standards, not statutory.

Which publication does not include model forms that can be used for certification and reporting purposes?

• HSE Guidance Note GS38.

• The IET On-Site Guide.

• IET Guidance Note 3.

• BS 7671.

Answer explanation

HSE Guidance Note GS38 focuses on health and safety in electrical work but does not provide model forms for certification and reporting, unlike the other publications listed.

Which test would not apply to an electrical installation forming part of a TN-S system?

• Earth fault loop impedance.

• Insulation resistance.

• Earth electrode resistance.

• Functional tests.

Answer explanation

In a TN-S system, the earth electrode resistance test is not applicable because the system relies on a separate earth conductor, making this test irrelevant compared to the other tests listed.

Which test could also indicate the supply polarity?

• External earth fault loop impedance.

• Continuity of protective conductors.

• Insulation resistance.

• Continuity of ring final circuits.

Answer explanation

The external earth fault loop impedance test measures the impedance of the earth fault loop, which can indicate the supply polarity by showing the direction of current flow in the circuit.