15. What is the responsibility of the duty-holder in the inspection and testing procedure?

Manage regular calibration dates.

17. What should be undertaken if a main protective bonding conductor cannot be seen throughout its length?

It should be tested for continuity.

It should be replaced for another.

It should be pulled to check for breaks.

It should be exposed to see it throughout.

18. What would be checked by visual inspection to verify that additional protection is suitably provided by an RCD?

That the IΔN does not exceed 30 mA.

That the IΔN does not exceed 300 mA.

That the IΔN does not exceed 150 mA.

That the IΔN does not exceed 100 mA.

19. When is it acceptable to insert a cross against any item in the schedule of inspections for on an Electrical Installation Certificate?

Under no circumstances, as all must comply.

Where an installation earth electrode is corroded.

When the earthing conductor is under-sized.

Should an item listed be not applicable.

28. Which test does not require GS38 compliant leads?

Continuity of protective conductors.

31. What is a suitable method of testing the function of an insulation resistance tester?

Test with probes open then touching.

Testing a known length of cable.

Checking the last calibration date.

32. Why does continuity testing precede insulation resistance when conducting initial verification?

To ensure conductors are continuous before testing between them.

To ensure conductors are sufficiently insulated before using high voltages.

To ensure the cpc is present to protect persons during high voltage testing.

To ensure all protective devices will trip should a short circuit be revealed.

33. Why is a set test sequence not required when testing existing installations having reliable test records?

Previous test data shows that no faults are present.

Circuits have been working so no faults are possible.

Tests should be arranged to minimize disturbance.

Dead tests are only required to confirm compliance.

35. During the ring-final circuit test, and following successful end to end loop testing, the results at one socket-outlet was: Line – neutral: open circuit line to cpc – 0.12 Ω What is the most likely reason for the open circuit, line to neutral reading? Scenario: Refurbishment work has been undertaken in a retail unit. One new ring-final socket-outlet circuit and one new lighting circuit have been installed. There are no previous records or charts for the electrical installation, so the client requires inspection and testing to the existing circuits. The unit is currently occupied by the client, so some work is being undertaken out of normal operating hours. The supply and installation form a 400/230 V, three-phase TN-C-S system. All testing is to be undertaken at an ambient temperature of 20 °C.

Cross polarity line and neutral.

46. A test is carried out to determine the effectiveness of the earth electrode using an earth fault loop impedance tester. What must be carried out before testing? Scenario: Inspection and testing is to be carried out to a domestic dwelling forming part of a 230 V single-phase TT system. One lighting circuit has had one new lighting point added and the remaining existing installation is to undergo a periodic inspection and test. The earthing conductor connecting the installation earth electrode to the MET has both corrosion and mechanical protection. The installation is protected by a 300 mA RCD for fault protection and all circuits are protected by individual 30 mA RCBOs to BS EN 61009S providing additional protection. A test is carried out to determine the effectiveness of the earth electrode using an earth fault loop impedance tester.

The installation is isolated and the earthing conductor disconnected.

The installation is energized and the earthing conductor connected.

The installation is energized and the earthing conductor disconnected.

The installation is isolated and the earthing conductor connected.

49. When should the integral test button on the RCBOs be operated whilst undertaking the periodic tests? Scenario: Inspection and testing is to be carried out to a domestic dwelling forming part of a 230 V single-phase TT system. One lighting circuit has had one new lighting point added and the remaining existing installation is to undergo a periodic inspection and test. The earthing conductor connecting the installation earth electrode to the MET has both corrosion and mechanical protection. The installation is protected by a 300 mA RCD for fault protection and all circuits are protected by individual 30 mA RCBOs to BS EN 61009S providing additional protection. A test is carried out to determine the effectiveness of the earth electrode using an earth fault loop impedance tester.

Not required for periodic tests.

After the 0.5 × IΔN but before 1 × IΔN test.

2391-52 Exam Practice 3 (IET) Quiz

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

1. What is the purpose of an initial verification?

To confirm the installation is defective or has not deteriorated over time.

To confirm the installation complies with the design or construction parts of BS 7671.

To confirm that the client is satisfied with all the work carried out.

To confirm that contractual elements have been undertaken to ISO 9001.

Answer explanation

Correct answer: b "To confirm the installation complies with the design or construction parts of BS 7671."
Guidance Note 3 (21) states that the purpose of an initial verification is to confirm, by way of inspection and testing, that the installation complies with the design and construction aspects of BS 7671, in so far as is reasonably practical.

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

2. Why is periodic inspection and testing undertaken?

To provide an engineering view that an installation can continue to be used safely.

To provide proof that an alteration to an installation complies with current regulations.

To provide an engineering view that the installation was constructed correctly.

To provide proof that all additions to the installation comply with current regulations.

Answer explanation

Correct answer: a "To provide an engineering view that an installation can continue to be used safely."
Guidance Note 3 (3.1) states that the purpose of periodic inspection and testing is to provide an engineering view on whether or not the installation is in a satisfactory condition where it can continue to be used safely. All other options reference new work which involves initial verification.

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

3. What situation would require the issue of an Electrical Installation Condition Report?

The addition of a light to an existing circuit.

The installation of a new distribution board.

Changing a building use from a house to a hotel.

Changing a radial circuit into a ring-final circuit.

Answer explanation

Correct answer: c "Changing a building use from a house to a hotel."
Where the use of a building changes, the local authority, as well as insurance companies, would require a report to determine the suitability of the installation for the new use.

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

4. What is the most suitable document to be issued by an inspector following the addition of an outdoor socket-outlet supplied from an existing ring-final circuit?

Electrical Installation Certificate.

Building Controls Certification to Part P.

Electrical Installation Condition Report.

Minor Electrical Installation Works Certificate.

Answer explanation

Correct answer: d "Minor Electrical Installation Works Certificate."
Where the addition to an existing circuit does not extend to a new circuit, a Minor Electrical Installation Works Certificate would be the simplest document which can be issued by the inspector to certify the new work.

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

5. What decision does an inspector need to make when undertaking periodic inspection, which is not required during initial verification?

The amount of sampling undertaken.

The type of certification to be used.

The suitability of the test instruments.

The suitability of test results obtained.

Answer explanation

Correct answer. a "The amount of sampling undertaken."
During periodic inspection and testing, the inspector would need to decide on the suitable amount of sampling required. Sampling is not undertaken for initial verification. Certification is not suitable for a periodic inspection and test instrument and result suitability applies in both cases.

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

6. What non-statutory document contains the maximum values of earth fault loop impedance at normal test temperature?
Scenario: Refurbishment work has been undertaken in a small industrial unit. Two new socket-outlet radial circuits were installed and several luminaires replaced on an existing lighting circuit. There are no previous records or charts for the electrical installation so the client requires inspection and testing to the existing circuits. The unit is currently vacant so the inspector has no restrictions on circuit or installation isolation. The supply and installation form a 230 V, single-phase TN-C-S system.

BS 7671.

IET GN3.

HSE GS38.

EAWR.

Answer explanation

Correct answer: b "IET GN3."
Whilst BS 7671 does contain maximum values of earth fault loop impedance, they are values given for circuit normal operating temperatures. When testing is undertaken, these values need adjusting so Guidance Note 3 (Appendix A) has values which are already compensated for, so a direct comparison can be made.

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

7. What must be carried out due to the lack of records and charts for the existing circuits?
Scenario: Refurbishment work has been undertaken in a small industrial unit. Two new socket-outlet radial circuits were installed and several luminaires replaced on an existing lighting circuit. There are no previous records or charts for the electrical installation so the client requires inspection and testing to the existing circuits. The unit is currently vacant so the inspector has no restrictions on circuit or installation isolation. The supply and installation form a 230 V, single-phase TN-C-S system.

Inspection would include cables concealed in walls.

A small sample of circuits would be tested first.

Inspection would include dismantling all equipment.

Exploratory work is done to determine circuit control.

Answer explanation

Correct answer: d "Exploratory work is done to determine circuit control."
Before any inspection or testing is carried out, the inspector must have the information relating to the control of each circuit and equipment. The inspector would need to carry out a full survey to do this.

8.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

8. What document must be used when verifying the two new socket-outlet circuits?
Scenario: Refurbishment work has been undertaken in a small industrial unit. Two new socket-outlet radial circuits were installed and several luminaires replaced on an existing lighting circuit. There are no previous records or charts for the electrical installation so the client requires inspection and testing to the existing circuits. The unit is currently vacant so the inspector has no restrictions on circuit or installation isolation. The supply and installation form a 230 V, single-phase TN-C-S system.

Minor Works Certificate.

Electrical Installation Certificate.

Electrical Installation Condition Report.

Periodic Inspection and Test Report.

Answer explanation

Correct answer: b "Electrical Installation Certificate."
New circuits must be verified using an Electrical Installation Certificate.

9.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

9. What inspection limitation is already noted on an Electrical Installation Condition Report?
Scenario: Refurbishment work has been undertaken in a small industrial unit. Two new socket-outlet radial circuits were installed and several luminaires replaced on an existing lighting circuit. There are no previous records or charts for the electrical installation so the client requires inspection and testing to the existing circuits. The unit is currently vacant so the inspector has no restrictions on circuit or installation isolation. The supply and installation form a 230 V, single-phase TN-C-S system.

Cables in trunking and conduit.

Cables in distribution boards.

Surface mounted cables.

Surface mounted switches.

Answer explanation

Correct answer: a "Cables in trunking and conduit."
On an Electrical Installation Condition Report (EICR), within the extent and limitations section, a note already declares that cables within trunking and conduit will not be inspected as part of the report.

10.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

10. What would be recorded on a test result sheet as the method of fault protection for the new socket-outlet circuits?
Scenario: Refurbishment work has been undertaken in a small industrial unit. Two new socket-outlet radial circuits were installed and several luminaires replaced on an existing lighting circuit. There are no previous records or charts for the electrical installation so the client requires inspection and testing to the existing circuits. The unit is currently vacant so the inspector has no restrictions on circuit or installation isolation. The supply and installation form a 230 V, single-phase TN-C-S system.

RCD.

Class II.

Class III.

ADS.

Answer explanation

Correct answer: d "ADS."
The newly installed socket-outlets circuits would be relying on automatic disconnection of supply as the protective measure against faults.

2391-52 Exam Practice 3 (IET)

60 questions

1. What is the purpose of an initial verification?

2. Why is periodic inspection and testing undertaken?

3. What situation would require the issue of an Electrical Installation Condition Report?

Correct answer: c "Changing a building use from a house to a hotel."
Where the use of a building changes, the local authority, as well as insurance companies, would require a report to determine the suitability of the installation for the new use.

4. What is the most suitable document to be issued by an inspector following the addition of an outdoor socket-outlet supplied from an existing ring-final circuit?

Correct answer: d "Minor Electrical Installation Works Certificate."
Where the addition to an existing circuit does not extend to a new circuit, a Minor Electrical Installation Works Certificate would be the simplest document which can be issued by the inspector to certify the new work.

5. What decision does an inspector need to make when undertaking periodic inspection, which is not required during initial verification?

Correct answer: d "Exploratory work is done to determine circuit control."
Before any inspection or testing is carried out, the inspector must have the information relating to the control of each circuit and equipment. The inspector would need to carry out a full survey to do this.

Correct answer: b "Electrical Installation Certificate."
New circuits must be verified using an Electrical Installation Certificate.

Correct answer: a "Cables in trunking and conduit."
On an Electrical Installation Condition Report (EICR), within the extent and limitations section, a note already declares that cables within trunking and conduit will not be inspected as part of the report.

Correct answer: d "ADS."
The newly installed socket-outlets circuits would be relying on automatic disconnection of supply as the protective measure against faults.

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2391-52 Exam Practice 3 (IET)

60 questions

1. What is the purpose of an initial verification?

2. Why is periodic inspection and testing undertaken?

3. What situation would require the issue of an Electrical Installation Condition Report?

Correct answer: c "Changing a building use from a house to a hotel."Where the use of a building changes, the local authority, as well as insurance companies, would require a report to determine the suitability of the installation for the new use.

4. What is the most suitable document to be issued by an inspector following the addition of an outdoor socket-outlet supplied from an existing ring-final circuit?

Correct answer: d "Minor Electrical Installation Works Certificate."Where the addition to an existing circuit does not extend to a new circuit, a Minor Electrical Installation Works Certificate would be the simplest document which can be issued by the inspector to certify the new work.

5. What decision does an inspector need to make when undertaking periodic inspection, which is not required during initial verification?

Correct answer: d "Exploratory work is done to determine circuit control."Before any inspection or testing is carried out, the inspector must have the information relating to the control of each circuit and equipment. The inspector would need to carry out a full survey to do this.

Correct answer: b "Electrical Installation Certificate."New circuits must be verified using an Electrical Installation Certificate.

Correct answer: a "Cables in trunking and conduit."On an Electrical Installation Condition Report (EICR), within the extent and limitations section, a note already declares that cables within trunking and conduit will not be inspected as part of the report.

Correct answer: d "ADS."The newly installed socket-outlets circuits would be relying on automatic disconnection of supply as the protective measure against faults.

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Correct answer: c "Changing a building use from a house to a hotel."
Where the use of a building changes, the local authority, as well as insurance companies, would require a report to determine the suitability of the installation for the new use.

Correct answer: d "Minor Electrical Installation Works Certificate."
Where the addition to an existing circuit does not extend to a new circuit, a Minor Electrical Installation Works Certificate would be the simplest document which can be issued by the inspector to certify the new work.

Correct answer: d "Exploratory work is done to determine circuit control."
Before any inspection or testing is carried out, the inspector must have the information relating to the control of each circuit and equipment. The inspector would need to carry out a full survey to do this.

Correct answer: b "Electrical Installation Certificate."
New circuits must be verified using an Electrical Installation Certificate.

Correct answer: a "Cables in trunking and conduit."
On an Electrical Installation Condition Report (EICR), within the extent and limitations section, a note already declares that cables within trunking and conduit will not be inspected as part of the report.

Correct answer: d "ADS."
The newly installed socket-outlets circuits would be relying on automatic disconnection of supply as the protective measure against faults.