What action should the inspector take, both before and after testing, to confirm isolation of the supply?

Confirm the operation of the approved voltage indicator.

Switch the main isolator on and off.

Lock the main switch on the open position.

Attach a warning label at the isolator stating ‘do not switch on’.

A test is to be carried out to confirm the continuity of the main protective bonding conductor to the metallic water installation pipework in a commercial premises. What is the risk if the installation is not safely isolated for this test?

Electric shock from different potentials.

Poor performance of connected equipment.

Possible loss of computer data.

Tripping hazards from the test method.

A test is to be carried out to confirm the continuity of the main protective bonding conductor to the metallic water installation pipework in a commercial premises. What is the purpose of the test of continuity of main protective bonding conductors?

To confirm extraneous conductive parts are connected to the MET.

To confirm there is a low earth return path for fault current.

To confirm exposed conductive parts are connected to the MET.

To confirm that a high current will flow in the event of an earth fault.

A test is to be carried out to confirm the continuity of the main protective bonding conductor to the metallic water installation pipework in a commercial premises. What important check must be made with the instrument leads before a reading is taken?

Leads are fitted with finger guards.

What is the most likely cause of the measured value being much higher than the calculated value?

Failure to null the test leads.

Heavy load on the installation.

Higher than normal ambient temperature.

Leakage current from computer equipment.

An earth fault loop impedance test is to be carried out on a radial circuit to the local isolator, as shown in Figure 4. What must the inspector confirm before the test can be undertaken?

The cpc and all other earthing and bonding is connected.

The cpc is disconnected from the MET and the main protective bonding is disconnected.

The cpc is connected to MET and the main protective bonding is disconnected.

The cpc is connected and all other earthing and bonding disconnected.

An earth fault loop impedance test is to be carried out on a radial circuit to the local isolator, as shown in Figure 4. Why can this earth fault loop impedance test be carried out before a test for insulation resistance?

Because the installation is already energised and in service.

To maximise inconvenience for the users of the installation.

Dead tests are not required at a periodic inspection and test.

The test will confirm there is no degradation of the insulation.

An earth fault loop impedance test is to be carried out on a radial circuit to the local isolator, as shown in Figure 4. Why do the test leads used for this test have to comply with GS 38?

The test is at a voltage above 50 V AC.

To ensure the test results are accurate.

Leads to GS 38 are required for all tests.

An earth fault loop impedance test is to be carried out on a radial circuit to the local isolator, as shown in Figure 4. Why would a test to confirm continuity of cpc be unnecessary once the earth fault loop impedance test is completed?

Earth fault loop impedance can confirm continuity of cpc.

Reduces the time taken for the periodic inspection.

Continuity can be proved during insulation resistance testing.

Dead tests are not required at a periodic inspection and test.

What is confirmed by an earth fault loop impedance test on a radial power circuit?

Automatic disconnection of supply will be achieved in the event of a fault.

The line and cpc conductors are the right csa.

Fault protection is provided for the whole installation.

The circuit breaker can disconnect the maximum prospective fault current.

Voltage drop of a single-phase distribution circuit supplying a power distribution board in a remote building is to be verified as part of the periodic inspection and testing within a workshop complex. The installation forms part of a public 400/230 V TN-S system. The circuit has a measured R1+Rn value of 0.15 Ω and an Ib of 60 A. The circuit protective device has an In of 80 A, see Figure 5. Which are the cable characteristics that affect voltage drop?

Length and cross-sectional area.

Type of insulation and room temperature.

Voltage drop of a single-phase distribution circuit supplying a power distribution board in a remote building is to be verified as part of the periodic inspection and testing within a workshop complex. The installation forms part of a public 400/230 V TN-S system. The circuit has a measured R1+Rn value of 0.15 Ω and an Ib of 60 A. The circuit protective device has an In of 80 A, see Figure 5. Why is the test to confirm voltage drop carried out?

To confirm correct operation of the protective device.

To confirm the cable operates at its maximum temperature.

To confirm the circuits function as they are intended.

To confirm the circuit will not be overloaded.

Testing of the RCDs is to be undertaken on the installation which forms part of a TT system as shown in Figure 6. What is confirmed by testing the 100 mA RCD?

That fault protection is provided for the installation.

The RCD can provide overload protection.

The RCD can disconnect the short circuit current.

That additional protection is provided for the installation.

Testing of the RCDs is to be undertaken on the installation which forms part of a TT system as shown in Figure 6. What must be agreed with the users of the installation before the test of the 100 mA RCD can be carried out?

The installation can be completely isolated.

The test of protective bonding continuity is completed first.

The evacuation of all personnel from the building.

The earthing conductor can be disconnected.

Testing of the RCDs is to be undertaken on the installation which forms part of a TT system as shown in Figure 6. What is the purpose of the ½ x IΔn test on both the 100 mA and 30 mA RCD’s?

To ensure neither device operates before it should.

To ensure they both operate in parallel with each other.

To ensure the 100 mA RCD is too sensitive.

To ensure the 30 mA RCD is too sensitive.

What is the purpose of carrying out a test to determine the prospective fault current at the origin of a three-phase commercial installation?

The protective devices can safely disconnect the fault current.

The earth fault loop path can carry the fault current.

The overcurrent devices will disconnect the earth fault current.

The overcurrent devices are rated lower than the fault current.

The radial circuit is installed using single-core cables in PVC conduit. The installation is 5 years old and there have been no alterations or additions to the radial circuit. Why would it be unnecessary to carry out a continuity of cpc for this circuit at periodic inspection and test?

Continuity of cpc can be confirmed during a test of Z s .

The circuit is installed in PVC conduit and so less likely to be damaged.

Continuity tests are only necessary if the circuit is in flat profile cable.

The circuit is only five years old so continuity testing is not required.

Periodic Inspection and Testing of Electrical Installations

Authored by Sayed Habib

Professional Development

Used 4+ times

Periodic Inspection and Testing of Electrical Installations

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40 questions

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What would be the correct procedure to confirm that the existing electrical installation in a dwelling is suitable for the additional wiring of an extension?

A visual inspection of the wiring and condition of the accessories.

A full review of the original electrical installation certificate.

Certification of the additional wiring on completion of the extension.

A periodic inspection and test of the existing installation.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the purpose of a periodic inspection and test relating to the safety of the building?

There is no risk of electric shock and burns.

There is no risk of fire caused by the electrical installation.

That the electrical installation is not damaged.

That there are no defects or non-compliances present.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the minimum level of IP protection for the opening shown as Item A in Figure 1?

IP4X

IPX4

IP2X

IPX2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the minimum level of IP protection for the accessible top surface of a consumer unit?

IP4X

IPX4

IP2X

IPX2

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which publication gives detailed information for carrying out testing of electrical installations?

HSE GS 38

IET Guidance Note 3

IET Guidance note 1

HS(G)141

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What would be agreed with the client and recorded as a limitation for a periodic inspection and test?

No insulation resistance testing between live conductors to be carried out.

The installation can be isolated and a full range of tests to be carried out.

The finalised report is to be provided to the client electronically.

Only calibrated test instruments are to be used.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which statutory document includes the requirements for working on live conductors?

The Electricity Safety Quality and Continuity Regulations.

The Construction (Design and Management) Regulations.

The Health and Safety at Work Act.

The Electricity at Work Regulations.

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Periodic Inspection and Testing of Electrical Installations

What would be the correct procedure to confirm that the existing electrical installation in a dwelling is suitable for the additional wiring of an extension?

What is the purpose of a periodic inspection and test relating to the safety of the building?

What is the minimum level of IP protection for the opening shown as Item A in Figure 1?

What is the minimum level of IP protection for the accessible top surface of a consumer unit?

Which publication gives detailed information for carrying out testing of electrical installations?

What would be agreed with the client and recorded as a limitation for a periodic inspection and test?

Which statutory document includes the requirements for working on live conductors?

What action should the inspector take, both before and after testing, to confirm isolation of the supply?

Which human sense is best used to confirm the terminals are suitably tightened?

What is confirmed when inspecting the conductor insulation?

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