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City And Guild Second Edition: for the Level 3 Apprenticeships (5357 and 5393), Level 3 Advanced Technical Diploma (8202), Level 3 Diploma (2365): > Inspection testing and commissioning electrical installations > Flashcards

Inspection testing and commissioning electrical installations Flashcards

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1
Q

What is the primary purpose of initial verification of an electrical installation?

A

To ensure compliance with current regulations and confirm suitability for use

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2
Q

According to the Electricity at Work Regulations 1989, who is responsible for ensuring the safety of electrical installations during inspection and testing?

A

The duty holder (the person in control of the danger)

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3
Q

What does Regulation 13 of the EAWR 1989 emphasize regarding electrical equipment made dead for inspection and testing?

A

Adequate precautions should be taken to prevent it from becoming electrically charged during work

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4
Q

During the isolation process, why is it important to post caution notices?

A

To alert everyone to the ongoing work being carried out

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5
Q

How many signatures are typically required on the certificate for initial verification of an electrical installation, and who provides these signatures?

A

Three signatures by the designer, installer, and the duty holder

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6
Q

Which regulation of the EAWR 1989 deals specifically with work on or near live conductors during inspection and testing?

A

Regulation 14

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7
Q

What is the key purpose of a voltage indicator in the isolation process?

A

To confirm the isolation is secure by testing for voltage presence

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8
Q

What is the term for the procedure that involves applying potentially dangerous test voltages and currents to an electrical installation?

A

Inspection and testing

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9
Q

What are the risks associated with not carrying out safe isolation during inspection and testing?

A

Risk of electrocution, burns, arcing, and explosions

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10
Q

In the context of inspection and testing, what is the purpose of periodic inspection and testing?

A

To assess the safety of an existing electrical installation over time

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11
Q

Which of the following statutory documents imposes general duties on employers to ensure the health, safety, and welfare of employees, including electrical safety?

A

Health and Safety at Work Act 1974

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12
Q

What is the name of the document that outlines safe working practices for electrical isolation and can be downloaded from the Health and Safety Executive (HSE) website?

A

HSR25 Safe Working Practices Booklet

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13
Q

Which regulation of the EAWR 1989 emphasizes the importance of having adequate working space, access, and lighting at electrical equipment during inspection and testing?

A

Regulation 15

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14
Q

During a single-phase isolation, how many tests are typically carried out as part of the three-point test?

A

3

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15
Q

What is the term for the procedure that confirms that the voltage indicator is still functioning correctly after isolation?

A

Proving

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16
Q

Which of the following documents is specifically concerned with electrical safety and imposes responsibilities on the duty holder during inspection and testing?

A

Electricity at Work Regulations 1989

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17
Q

What is the primary purpose of Regulation 4(1) of the Electricity at Work Regulations 1989 (EAWR)?

A

To ensure that electrical systems are constructed to prevent danger

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18
Q

Which part of the Electricity at Work Regulations 1989 (EAWR) identifies the need to prevent danger by ensuring that electrical systems are constructed to be safe?

A

Regulation 4(1)

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19
Q

What is the key responsibility of the designer when providing a signature for the initial verification certificate of an electrical installation?

A

To declare any departures from regulations in the design

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20
Q

Which of the following is NOT a risk associated with not carrying out safe isolation during inspection and testing?

A

Risk of misinterpreting test results

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21
Q

What is the primary purpose of the proving unit used in the isolation process?

A

To test the accuracy of the voltage indicator

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22
Q

During a three-phase isolation, how many possible tests are typically carried out as part of the ten-point test, assuming the neutral is present?

A

10

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23
Q

What is the term for the process of confirming that the isolation is secure and that the correct equipment has been isolated before inspection and testing can proceed?

A

Confirmation of isolation

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24
Q

Which document outlines safe working practices for electrical isolation and can be downloaded from the Health and Safety Executive (HSE) website?

A

HSR25 Safe Working Practices Booklet

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25
Q

What is the primary purpose of periodic inspection and testing of electrical installations?

A

To assess the on-going safety of an existing electrical installation over time

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26
Q

Which statutory document imposes general duties on employers to ensure the health, safety, and welfare at work, including electrical systems and installations?

A

The Health and Safety at Work Act 1974

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27
Q

What is the primary focus of the Electricity at Work Regulations 1989 (EAWR)?

A

Public safety with regard to electrical installations

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28
Q

Which document requires every employer to assess the risks to workers and others who may be affected by work activities, including electrical installations?

A

The Management of Health and Safety at Work Regulations 1999

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29
Q

According to the Provision and Use of Work Equipment Regulations 1998, what is required regarding equipment used for work activities involving electricity?

A

Equipment must be maintained in an efficient state, in working order, and in good repair.

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30
Q

Which document specifically applies to electrical installations in domestic dwellings and is often referred to as “electricity at home regulations”?

A

Part P of the Building Regulations

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31
Q

What is the primary purpose of the IET Wiring Regulations (BS 7671: 2018)?

A

To set international safety rules for electrical installations

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32
Q

Which document serves as a simple guide to the practical approach of designing, installing, inspecting, and testing electrical installations?

A

The IET On-Site Guide (OSG) to BS 7671

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33
Q

Which document, published by the Health and Safety Executive (HSE), provides guidelines for good practice when using electrical test equipment to reduce the risk of danger and injury?

A

HSE Guidance Note GS38

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34
Q

Which form is used when alterations or additions are made to an existing circuit, such as adding a light to an already working lighting circuit?

A

Minor Electrical Installation Works Certificate (MEIWC)

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35
Q

What is the purpose of an Electrical Installation Certificate (EIC) used during initial verification?

A

To certify new installations, rewires, or the installation of a single circuit or a change of consumer unit or distribution board

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36
Q

What is the primary purpose of the Electrical Installation Condition Report (EICR) in the context of periodic inspection and testing?

A

To assess the on-going safety of existing electrical installations

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37
Q

According to BS 7671 Regulation 514.9.1, what information must be provided before carrying out an initial verification of an electrical installation?

A

Diagrams, documents, plans, and design criteria for the building

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38
Q

What must be inserted on the Electrical Installation Certificate (EIC) after assessing the maximum demand and diversity of a new installation?

A

The assessed demand after diversity*

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39
Q

Which document provides specific guidance on inspection and testing in relation to BS 7671 and is prepared by the IET?

A

The IET Guidance Note 3: Inspection and Testing to BS 7671

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40
Q

What is the purpose of the Generic Schedule(s) of Test Results in initial verification documentation?

A

To document the results of electrical tests and inspections carried out during initial verification

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41
Q

Which document is used to report the condition of an existing electrical installation and is not classified as certification?

A

Electrical Installation Condition Report (EICR)

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42
Q

In the context of periodic inspection and testing, what is the purpose of the Condition Report Inspection Schedule(s)?

A

To document the condition of the electrical installation, including any observed defects and limitations

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43
Q

What does the term “extent” refer to in the context of limitations during electrical inspection and testing?

A

The amount of inspection and testing to be performed

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44
Q

In the context of limitations during electrical inspection and testing, what is the difference between agreed limitations and operational limitations?

A

Agreed limitations are pre-defined, while operational limitations arise during the testing process.

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45
Q

Which document provides details of methods used to calculate the maximum demand and diversity of small installations?

A

Appendix A of the IET On-Site Guide (OSG)

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46
Q

In an Electrical Installation Condition Report (EICR), what information must be provided to satisfy Regulation 514.9.1 of BS 7671?

A

A diagram or table indicating the type and composition of each circuit, method of compliance with Regulation 410.3.2, and other information specified in the regulation

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47
Q

What is the nominal voltage to earth (U0) for low-voltage public electricity supply systems?

A

230 V

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48
Q

Which document provides guidelines for good practice when using electrical test equipment and is intended to reduce the risk of danger and injury during electrical tests?

A

HSE Guidance Note GS38

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49
Q

What information is essential before carrying out an initial verification of an electrical installation according to BS 7671 The IET Wiring Regulations, 18th Edition and IET Guidance Note 3?

A

Maximum demand and diversity, conductor and system earthing arrangements, supply characteristics, and diagrams/documents/plans/design criteria for the building

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50
Q

Which part of the electrical installation process involves assessing the maximum demand and diversity of a new installation?

A

Certification phase*

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51
Q

What information should be included on the Electrical Installation Certificate regarding the maximum demand?

A

The assessed demand after diversity

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52
Q

In the context of electrical systems, what does “TN or TT system” refer to?

A

Conductor and system earthing arrangements

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53
Q

What is the nominal voltage to earth (U0) for low-voltage public electricity supply systems in the UK?

A

230 V

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54
Q

What information does an inspector need to know about supply characteristics for an electrical installation?

A

Nominal voltage (U0), current type, frequency, prospective short-circuit current (PFC), and external earth fault loop impedance (Ze)

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55
Q

What is the purpose of the external earth fault loop impedance (Ze) in electrical installations?

A

To determine fault current levels and protective device coordination

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56
Q

Which document outlines the information required for the identification of each device performing functions like protection, isolation, and switching in an electrical installation?

A

Diagrams, documents, plans, and design criteria for the building, as specified in Regulation 514.9.1

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57
Q

Which sense is primarily used during the inspection process to identify signs of burning or overheating due to bad connections?

A

Sight

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58
Q

What method is used to assess protection against access with a finger, as described in the IP code (e.g., IP2X)?

A

Using a British Standard finger (IPXXB

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59
Q

When is automatic disconnection of supply (ADS) typically used as a form of fault protection?

A

In systems to ensure disconnection in the event of a fault for electrical safety purposes

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60
Q

What does RCD stand for in the context of electrical protection?

A

Residual Current Device

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61
Q

Which British Standard specifies the regulations for electrical installations in the UK?

A

BS 7671

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62
Q

What is the typical frequency of the electricity supply in the UK?

A

50 Hz

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62
Q

In an electrical installation, what is the purpose of the protective bonding conductors?

A

To connect extraneous conductive parts to prevent differences in potential

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63
Q

When inspecting an electrical installation, what is the primary purpose of checking connections between conductors and equipment?

A

To ensure durable electrical continuity and mechanical strengt

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64
Q

What is the minimum cross-sectional area required for a supplementary bonding conductor connecting two extraneous conductive parts in accordance with BS 7671?

A

2.5 mm²

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65
Q

In the context of electrical installations, what does SELV stand for?

A

Separated Extra-Low Voltage

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66
Q

Which human sense is primarily used to detect arcing caused by insecure connections during the inspection of electrical installations?

A

Hearing

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67
Q

What is the main purpose of the Electrical Installation Certificate (EIC)?

A

To certify that the installation complies with BS 7671 and other regulations

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68
Q

What is the purpose of supplementary equipotential bonding as additional protection in electrical installations?

A

To provide additional protection against electric shock

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69
Q

Which IP code indicates that an enclosure is protected against access with the back of the hand and against solid foreign objects of 50 mm diameter and greater?

A

IP2X

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70
Q

According to Regulations 132.11 and 515.1, what is the requirement regarding the electrical installation’s impact on other installations?

A

It should not cause detriment to other electrical and non-electrical installations.

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71
Q

When selecting devices for an electrical installation, which of the following devices are needed according to the provided information?

A

Fault protective devices, AFDDs, and surge protection devices.

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72
Q

What is the purpose of providing a means of isolation at the origin of the installation?

A

To interrupt the supply on load and ensure safety.

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73
Q

In a TN-S or TN-C-S system, which conductors need to be interrupted by the isolator at the origin of the installation?

A

Only the line conductors.

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74
Q

According to the information, which of the following should be provided with a means of switching for safety and maintenance purposes?

A

Hand dryers and showers.

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75
Q

What is the primary function of an isolator?

A

To switch on/off the supply during no-load conditions.

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76
Q

Why is it important to check the manufacturer’s information regarding the rating of a device for switching?

A

To ensure the device is rated for its intended use as a switch.

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77
Q

Which level of protection is indicated by the code “IPX7” in equipment used where water is likely to be present?

A

Protected against immersion in water.

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78
Q

When completing a schedule of inspections for an Electrical Installation Certificate, what should be marked in the boxes for compliance?

A

A tick for compliance

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79
Q

According to the provided information, which of the following is not regarded as a protective measure and forms part of ADS (Automatic Disconnection of Supply)?

A

FELV (Functional Extra-Low Voltage)

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80
Q

What is the purpose of item 2.1 on the schedule of inspections checklist?

A

To ensure the generator doesn’t power up the supply system.

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81
Q

According to item 1.0, what should inspectors check regarding the consumer’s isolator?

A

Its level of basic protection against electric shock.

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82
Q

When dealing with a backup generator, what is the importance of an independent earthing system?

A

It ensures the supply system is not energized if the supply system fails.

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83
Q

Which item on the checklist deals with the compatibility of characteristics of means of generation?

A

Item 2.5

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84
Q

What is the purpose of means to provide automatic disconnection of the generator in the event of a loss of the public supply system or voltage/frequency deviation beyond declared values?

A

To ensure safety by disconnecting the generator in case of power system issues.

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85
Q

What is the purpose of the distributor’s earthing arrangement according to Regulation 3.1?

A

To ensure proper earthing based on the supply earthing arrangement.

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86
Q

When would supplementary equipotential bonding be provided according to Regulation 3.7?

A

In situations where disconnection times cannot be met, and an RCD is not feasible.

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87
Q

what is the purpose of Class II or equivalent equipment?

A

To minimize the risk of parts becoming live.

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88
Q

What is the primary purpose of RCDs not exceeding 30 mA as specified in Regulation 6.1?

A

To provide additional protection against fault currents.

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89
Q

According to Regulation 7.15, where should all single-pole devices such as fuses or circuit breakers be connected?

A

To the phase conductor only.

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90
Q

What is the purpose of providing protection against electromagnetic effects where cables enter ferromagnetic enclosures (Regulation 7.18)?

A

To reduce heating effects caused by induced eddy currents.

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91
Q

What should be ensured regarding conductor connections, as per Regulation 7.19?

A

Connections must be tight and correctly located in terminals.

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92
Q

What is the purpose of an isolator in an electrical installation?

A

To disconnect the entire installation or individual circuits.

93
Q

Why is it essential to verify the suitability of equipment in terms of IP and fire ratings?

A

To protect against external influences and fire hazards.

94
Q

What is the purpose of a firefighter’s switch in an electrical installation?

A

To provide emergency shutdown in the event of a fire.

95
Q

In an electrical installation, what does “undervoltage protection” refer to?

A

Protection against voltage sags and drops.

96
Q

Why is it important to ensure that cables and conductors are correctly connected and enclosed without undue mechanical strain?

A

To ensure reliable electrical connections.

97
Q

What does “supplementary bonding” refer to in an electrical installation?

A

Connecting conductive parts to maintain equal potential.

98
Q

In an electrical installation, why is it necessary to verify the coordination between conductors and overload protective devices?

A

To ensure that conductors are suitably sized for the intended load.

99
Q

What is the purpose of “additional protection” in an electrical installation?

A

To provide protection against external influences.

100
Q

What is the primary purpose of testing in an electrical installation?

A

To confirm the installation’s compliance with safety and performance standards.

101
Q

Why is it important to obtain comprehensive and reliable test results during the initial verification of an installation?

A

Because future periodic testing will likely only be sampling.

102
Q

Which of the following tests relies on the results of continuity tests for conductors?

A

Insulation resistance.

103
Q

When might the test for “Insulation resistance/impedance of floors and walls” (643.5) be applicable in an electrical installation?

A

Very rarely, as it is only applicable in specific, unusual installations.

104
Q

Which type of test meter is commonly used for checking the continuity of protective conductors and ring-final circuit conductors?

A

Low-resistance ohmmeter.

105
Q

What is the minimum requirement for the short-circuit current of a low-resistance ohmmeter used for continuity testing?

A

200 mA.

105
Q

Which test meter setting is used for insulation resistance testing?

A

Megohms (MΩ).

106
Q

What is the typical test voltage for insulation resistance testing?

A

250 V DC, 500 V DC, or 1000 V DC.

107
Q

Which test meter is used to measure earth fault loop impedance and prospective fault current?

A

Earth fault loop impedance tester.

108
Q

What is the maximum value for earth fault loop impedance typically measured in?

A

Ohms (Ω).

109
Q

What type of test is performed with an RCD tester?

A

Residual current device operation.

110
Q

Why is it essential to ensure that the correct scale and setting are selected on a test instrument?

A

To avoid incorrect test results and ensure safety.

111
Q

What does the number “1” on the left side of a meter’s display typically indicate?

A

An out-of-range measurement.

112
Q

When is it appropriate to use the ‘no-trip’ function when testing earth fault loop impedance?

A

Only in circuits with RCDs.

113
Q

What is the purpose of calibrating test equipment?

A

To ensure the accuracy of measurements.

114
Q

Which of the following is a crucial aspect of ensuring safe and correct use of test instruments?

A

Understanding the equipment to be used.

115
Q

What does GS38 relate to in electrical testing?

A

Equipment safety standards for electricians.

116
Q

When should test leads be checked for compliance with Health and Safety Executive Guidance Note GS38?

A

Regularly, especially before important tests.

117
Q

What type of testing principle is generally used for earth fault loop impedance testers?

A

Current measurement.

118
Q

Which of the following is an essential step when using test instruments for electrical testing?

A

Verify the instrument’s accuracy with a well-known reference.

119
Q

What type of test is typically performed using an earth electrode resistance test instrument?

A

Earth electrode resistance.

120
Q

Which safety feature should probes have when conducting electrical testing?

A

Finger barriers.

121
Q

What is the purpose of the ‘no-trip’ function in earth fault loop impedance testing?

A

To prevent tripping of RCDs during testing.

122
Q

Why is it important to choose the correct scale and setting on a test instrument?

A

To ensure accurate measurements and prevent errors.

123
Q

What is the primary purpose of calibration for test equipment?

A

To confirm the accuracy of measurements.

124
Q

Which of the following is a critical factor in selecting an appropriate test scale and setting for an instrument?

A

The specific test being conducted and the expected values.

125
Q

What should be checked regularly to ensure the safe and accurate use of test instruments?

A

Calibration status and accuracy.

126
Q

In electrical testing, what is the primary function of test leads?

A

To facilitate safe and secure connections between the instrument and the installation.

127
Q

What is the maximum short-circuit capacity that prospective fault current readings should be compared to?

A

The rated short-circuit capacity of protective devices.

128
Q

What is the primary reason for conducting continuity tests on electrical conductors?

A

To confirm the absence of parallel paths.

129
Q

When is it assumed that safe isolation has already been carried out in continuity tests?

A

For ‘dead’ tests.

130
Q

Which type of meter is typically used for continuity tests of earthing conductors?

A

Low-resistance ohmmeter.

131
Q

What additional equipment might be needed for a continuity test of an earthing conductor?

A

A long wander lead, depending on the length of the earthing conductor.

132
Q

How should test leads be checked before using them for a continuity test?

A

By checking for visible damage.

133
Q

What is the primary reason for disconnecting the earthing conductor at the MET (main earthing terminal) before conducting a continuity test?

A

To facilitate safe and accurate measurements.

134
Q

What is the purpose of the ‘open lead test’ in meter preparation for continuity testing?

A

To check for damaged leads.

134
Q

Which safety consideration is essential when using long wander leads for continuity testing?

A

Carrying out a full risk assessment if the building is occupied.

135
Q

Which type of testing method is generally discouraged for initial verification of ring-final circuits?

A

R2 method.

136
Q

Why is it encouraged to obtain R1 + R2 values for ring-final circuits during initial verification?

A

To make earth fault loop testing easier.

137
Q

When conducting the figure 8 test for ring-final circuits, what should be interconnected to form the figure 8 configuration?

A

The lines and circuit protective conductors of both legs.

138
Q

What is the primary purpose of insulation resistance testing in electrical circuits?

A

To confirm the integrity of insulation.

139
Q

Which voltage is typically used for insulation resistance testing of circuits that operate up to 500 V?

A

250 V DC.

140
Q

Why is a low test current used during insulation resistance testing?

A

To reduce the risk of electrocution.

141
Q

What is the purpose of testing insulation resistance in an electrical installation?

A

To detect damage or deterioration of insulation.

142
Q

What is the main purpose of the continuity test for earthing conductors?

A

To ensure that the conductor is not broken and is connected to the means of earthing.

143
Q

Which type of meter is typically used for continuity tests of main protective bonding conductors?

A

Low-resistance ohmmeter.

144
Q

When should the main protective bonding conductors be disconnected before conducting continuity tests?

A

Always before any continuity tests.

145
Q

What is the primary reason for disconnecting the main protective bonding before conducting continuity tests?

A

To remove possible parallel paths.

146
Q

Which test method is recommended to verify continuity of main protective bonding conductors?

A

R1 + R2 method.

147
Q

What is the purpose of the continuity test for circuit protective conductors (cpc) in radial circuits?

A

To confirm that the cpc is present and effectively connected to all points in the circuit.

148
Q

What is the primary reason for performing a continuity test on ring-final circuits?

A

To confirm the absence of parallel paths.

149
Q

What type of test is generally discouraged for initial verification of ring-final circuits?

A

R2 method.

150
Q

Why are the line and neutral conductors disconnected from the distribution board during the figure 8 test for ring-final circuits?

A

To confirm that the ring is wired correctly.

151
Q

What is the primary purpose of insulation resistance testing in electrical circuits?

A

To verify the quality of insulation.

152
Q

Which voltage is typically used for insulation resistance testing of circuits that operate over 500 V?

A

1000 V DC.

153
Q

Why is insulation resistance testing essential on construction sites?

A

To detect damage to cable insulation caused by various construction activities.

154
Q

What is the primary reason for using low test currents during insulation resistance testing?

A

To reduce the risk of damage to the insulation.

155
Q

When should insulation resistance testing be performed on electrical installations?

A

During initial verification and periodic inspection.

156
Q

What does an insulation resistance test aim to detect in electrical installations?

A

Deterioration or damage to insulation.

157
Q

What additional equipment is needed when performing the insulation resistance test for general lighting and power circuits?

A

Connector block

158
Q

Why is it important to remove or disconnect loads before conducting the insulation resistance test?

A

To ensure correct test values

159
Q

Which electronic switching devices should be disconnected and bridged out during the insulation resistance test?

A

Dimmer switches

160
Q

In terms of health and safety considerations, why should you release the test button on the circuit tester before moving the probes?

A

To discharge any stored energy in the cables

160
Q

When is it reasonable to carry out the insulation resistance test on existing circuits during a Periodic Inspection and Test?

A

Always when required by the regulations

161
Q

What is recorded as the result of the insulation resistance test for an entire installation?

A

One result per column covering all circuits

162
Q

According to BS 7671, what is the minimum insulation resistance value required for circuits with a nominal voltage above 500 V?

A

1.0 MΩ

163
Q

Why might the overall insulation resistance value of an installation be lower than expected?

A

Because circuits are in parallel

164
Q

If three individual circuits were tested between line and neutral with resistances of 20 MΩ, 20 MΩ, and 50 MΩ, what would be the overall resistance when tested together?

A

8.33 MΩ

165
Q

What is the purpose of the insulation resistance test for Separation of circuits, such as SELV and PELV?

A

To check the functionality of electrical separation devices

166
Q

What is the minimum acceptable insulation resistance value for circuits undergoing the Separation of circuits test?

A

1.0 MΩ

167
Q

Why is it essential to isolate the primary source circuit before conducting the Separation of circuits test?

A

To ensure the secondary circuit is not in contact with the primary circuit

168
Q

What should be done if any result below 1 MΩ is recorded during the Separation of circuits test?

A

Investigate and rectify inadequate separation

169
Q

What is the primary reason for performing the test for Separation of circuits?

A

To ensure circuits relying on electrical separation are reliably separated

170
Q

What additional equipment is needed for testing insulation resistance in general lighting and power circuits?

A

Test load resistor

171
Q

What is the purpose of bridging out electronic switching devices like dimmer switches during insulation resistance testing?

A

To avoid damaging them

172
Q

Why should the supply be isolated when testing insulation resistance?

A

To avoid electrocution

173
Q

In which situations should you test between live and earth only during insulation resistance testing?

A

When equipment is reasonably practical to isolate

174
Q

When should switches be in the closed (on) position during insulation resistance testing?

A

To allow readings throughout the entire circuit

175
Q

What is the term used to describe something located in such a position that expensive or unavailable specialist equipment is needed to isolate it?

A

Not reasonably practical

176
Q

What is the minimum value of insulation resistance for circuits with a nominal voltage of up to and including 500 V, except SELV and PELV circuits?

A

1.0 MΩ

176
Q

What can affect insulation resistance readings in an otherwise healthy circuit?

A

Multiple resistances in parallel

177
Q

What is the method of determining the separation of circuits such as SELV or PELV circuits?

A

Inspection

178
Q

What is the primary purpose of earth electrode resistance testing?

A

To check the integrity of the earth electrode

179
Q

What meter is typically used for earth electrode resistance testing?

A

Low-resistance ohmmeter

180
Q

What is the primary consideration for health and safety during earth electrode resistance testing?

A

Avoiding exposure to live terminals

181
Q

How are the average earth electrode resistance test readings calculated?

A

Averaging the three readings

182
Q

What is the maximum allowable test value for Zs if a circuit is protected by a 32 A Type C circuit breaker, and the table value is 0.68 Ω at operating temperature?

A

0.54 Ω

183
Q

Why are calculated values of Zs considered the worst case for protective devices?

A

Because they take parallel paths into account

184
Q

In which situations is a live EFLI test likely to produce lower values than calculated values?

A

When testing a ring-final circuit

185
Q

What type of circuit protection should be consulted for protection under short-circuit conditions if EFLI values exceed the limits for protective devices?

A

Adiabatic equation calculations

186
Q

What is the purpose of testing supply polarity?

A

To confirm the proper connection of line and neutral

187
Q

When should you test supply polarity in an installation?

A

Only during initial verification

188
Q

What method is used to determine supply polarity during testing?

A

Measurement using a voltmeter

189
Q

What is the primary purpose of safely disconnecting devices during testing?

A

To ensure devices don’t explode

190
Q

Why is it essential to establish the maximum possible fault current for an installation?

A

To ensure protective devices can handle fault currents

190
Q

What is the rated short-circuit capacity called for fuses, circuit breakers, and RCBOs?

A

Breaking capacity

191
Q

What should be done if a test instrument requires three leads to carry out the prospective fault current test?

A

Double up the earth and neutral leads

192
Q

When is it ideal to isolate the supply before conducting the prospective fault current test?

A

Only for initial verification

193
Q

What type of test is performed between L and N in single-phase installations?

A

Prospective short-circuit current (PSCC)

194
Q

What is recorded as the result for a single-phase prospective fault current test?

A

The highest value of L-N and L-E tests

195
Q

How can you verify that prospective fault current values are within acceptable limits?

A

Check the rated short-circuit capacities of protective devices

196
Q

Why is it important to conduct phase sequence testing?

A

To check if the phases are correctly wired

197
Q

What type of meter is typically used for phase rotation testing?

A

Phase rotation tester

198
Q

When should phase rotation testing be conducted?

A

After energizing phase-sequence sensitive equipment

199
Q

What is the primary purpose of testing RCDs under simulated fault current conditions?

A

To verify the functionality of RCDs

200
Q

What should the RCD tester be set to when testing RCDs?

A

The residual current rating of the RCD

201
Q

Why should the RCD test be conducted on the load side of the RCD?

A

To put a fault into the earthing system

202
Q

What is the expected result when testing RCDs at 0.5 times IΔn?

A

The RCD should not trip

203
Q

What is the maximum acceptable disconnection time for general-purpose RCDs?

A

300 milliseconds

204
Q

When is testing for voltage drop typically not required during initial verification?

A

When the installation is designed correctly

205
Q

What is the maximum acceptable voltage drop for power circuits in installations connected to a public supply?

A

5% of the supply voltage

206
Q

Which certificate demonstrates that electrical installation work has been designed, constructed, inspected, and tested in accordance with BS 7671?

A

Electrical Installation Certificate

207
Q

What should be included in the Operation and Maintenance (O&M) manual for electrical and electronic equipment?

A

Manufacturer’s documentation

208
Q

What is the primary reason for checking the sequence of three-phase supply conductors?

A

To verify that machines rotate in the correct direction

209
Q

What should be included in an Operation and Maintenance (O&M) manual for electrical and electronic equipment?

A

Manufacturer’s documentation

210
Q

Which certificate is appropriate when minor electrical installation work has been carried out?

A

Before voltage drop testing

211
Q

Why is it important to ensure that the Schedule of Circuit Details and the Schedule of Test Results are completed with satisfactory outcomes?

A

To demonstrate compliance with BS 7671

212
Q

What must be done if the voltage drop in a circuit exceeds permitted values during testing?

A

Correct the circuit before certification

213
Q

Which document provides information on each circuit in an electrical installation, including circuit design and test results?

A

Schedule of Circuit Details

214
Q

What should you do if equipment is found to be phase-sequence sensitive during phase rotation testing?

A

Check the manufacturer’s handbook

215
Q

Which type of RCD should be installed for additional protection requirements?

A

Time-delay (S type) RCD

216
Q

What is the primary purpose of the voltage drop test?

A

To ensure correct equipment operation

217
Q

When should testing of RCDs be conducted every six months?

A

When clocks are reset for daylight saving time changes

218
Q

What is the primary purpose of the Schedule of Inspections?

A

To demonstrate that no faults were found

219
Q

What is the purpose of checking phase rotation in an installation?

A

To ensure that machines rotate correctly

219
Q

Which certificate should be provided to the customer to confirm that electrical installation work complies with BS 7671?

A

Electrical Installation Certificate

220
Q

Which certificate is used when extensive electrical installation work has been carried out?

A

Electrical Installation Certificate

221
Q

What does the term “adiabatic equation calculation” refer to in the context of electrical testing?

A

A calculation to assess the adequacy of cable size

222
Q

Which document is used to provide proof of compliance with BS 7671 for minor electrical installation work?

A

Minor Electrical Installations Works Certificate

223
Q

When should the RCD test be performed in relation to earth fault loop impedance testing?

A

After earth fault loop impedance testing

224
Q

What is the primary purpose of performing a phase rotation test?

A

To verify that machines rotate correctly

225
Q

What information should be included in the Operation and Maintenance (O&M) manual for electrical and electronic equipment?

A

Manufacturer’s documentation

City And Guild Second Edition: for the Level 3 Apprenticeships (5357 and 5393), Level 3 Advanced Technical Diploma (8202), Level 3 Diploma (2365): (6 decks)

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