Inspection testing and commissioning electrical installations Flashcards
(232 cards)
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
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)
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
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
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
6
Q
Which regulation of the EAWR 1989 deals specifically with work on or near live conductors during inspection and testing?
A
Regulation 14
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
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
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
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
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
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
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
14
Q
During a single-phase isolation, how many tests are typically carried out as part of the three-point test?
A
3
15
Q
What is the term for the procedure that confirms that the voltage indicator is still functioning correctly after isolation?
A
Proving
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
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
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)
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
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
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
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
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
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
25
What is the primary purpose of periodic inspection and testing of electrical installations?
To assess the on-going safety of an existing electrical installation over time
26
Which statutory document imposes general duties on employers to ensure the health, safety, and welfare at work, including electrical systems and installations?
The Health and Safety at Work Act 1974
27
What is the primary focus of the Electricity at Work Regulations 1989 (EAWR)?
Public safety with regard to electrical installations
28
Which document requires every employer to assess the risks to workers and others who may be affected by work activities, including electrical installations?
The Management of Health and Safety at Work Regulations 1999
29
According to the Provision and Use of Work Equipment Regulations 1998, what is required regarding equipment used for work activities involving electricity?
Equipment must be maintained in an efficient state, in working order, and in good repair.
30
Which document specifically applies to electrical installations in domestic dwellings and is often referred to as "electricity at home regulations"?
Part P of the Building Regulations
31
What is the primary purpose of the IET Wiring Regulations (BS 7671: 2018)?
To set international safety rules for electrical installations
32
Which document serves as a simple guide to the practical approach of designing, installing, inspecting, and testing electrical installations?
The IET On-Site Guide (OSG) to BS 7671
33
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?
HSE Guidance Note GS38
34
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?
Minor Electrical Installation Works Certificate (MEIWC)
35
What is the purpose of an Electrical Installation Certificate (EIC) used during initial verification?
To certify new installations, rewires, or the installation of a single circuit or a change of consumer unit or distribution board
36
What is the primary purpose of the Electrical Installation Condition Report (EICR) in the context of periodic inspection and testing?
To assess the on-going safety of existing electrical installations
37
According to BS 7671 Regulation 514.9.1, what information must be provided before carrying out an initial verification of an electrical installation?
Diagrams, documents, plans, and design criteria for the building
38
What must be inserted on the Electrical Installation Certificate (EIC) after assessing the maximum demand and diversity of a new installation?
The assessed demand after diversity*
39
Which document provides specific guidance on inspection and testing in relation to BS 7671 and is prepared by the IET?
The IET Guidance Note 3: Inspection and Testing to BS 7671
40
What is the purpose of the Generic Schedule(s) of Test Results in initial verification documentation?
To document the results of electrical tests and inspections carried out during initial verification
41
Which document is used to report the condition of an existing electrical installation and is not classified as certification?
Electrical Installation Condition Report (EICR)
42
In the context of periodic inspection and testing, what is the purpose of the Condition Report Inspection Schedule(s)?
To document the condition of the electrical installation, including any observed defects and limitations
43
What does the term "extent" refer to in the context of limitations during electrical inspection and testing?
The amount of inspection and testing to be performed
44
In the context of limitations during electrical inspection and testing, what is the difference between agreed limitations and operational limitations?
Agreed limitations are pre-defined, while operational limitations arise during the testing process.
45
Which document provides details of methods used to calculate the maximum demand and diversity of small installations?
Appendix A of the IET On-Site Guide (OSG)
46
In an Electrical Installation Condition Report (EICR), what information must be provided to satisfy Regulation 514.9.1 of BS 7671?
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
47
What is the nominal voltage to earth (U0) for low-voltage public electricity supply systems?
230 V
48
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?
HSE Guidance Note GS38
49
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?
Maximum demand and diversity, conductor and system earthing arrangements, supply characteristics, and diagrams/documents/plans/design criteria for the building
50
Which part of the electrical installation process involves assessing the maximum demand and diversity of a new installation?
Certification phase*
51
What information should be included on the Electrical Installation Certificate regarding the maximum demand?
The assessed demand after diversity
52
In the context of electrical systems, what does "TN or TT system" refer to?
Conductor and system earthing arrangements
53
What is the nominal voltage to earth (U0) for low-voltage public electricity supply systems in the UK?
230 V
54
What information does an inspector need to know about supply characteristics for an electrical installation?
Nominal voltage (U0), current type, frequency, prospective short-circuit current (PFC), and external earth fault loop impedance (Ze)
55
What is the purpose of the external earth fault loop impedance (Ze) in electrical installations?
To determine fault current levels and protective device coordination
56
Which document outlines the information required for the identification of each device performing functions like protection, isolation, and switching in an electrical installation?
Diagrams, documents, plans, and design criteria for the building, as specified in Regulation 514.9.1
57
Which sense is primarily used during the inspection process to identify signs of burning or overheating due to bad connections?
Sight
58
What method is used to assess protection against access with a finger, as described in the IP code (e.g., IP2X)?
Using a British Standard finger (IPXXB
59
When is automatic disconnection of supply (ADS) typically used as a form of fault protection?
In systems to ensure disconnection in the event of a fault for electrical safety purposes
60
What does RCD stand for in the context of electrical protection?
Residual Current Device
61
Which British Standard specifies the regulations for electrical installations in the UK?
BS 7671
62
What is the typical frequency of the electricity supply in the UK?
50 Hz
62
In an electrical installation, what is the purpose of the protective bonding conductors?
To connect extraneous conductive parts to prevent differences in potential
63
When inspecting an electrical installation, what is the primary purpose of checking connections between conductors and equipment?
To ensure durable electrical continuity and mechanical strengt
64
What is the minimum cross-sectional area required for a supplementary bonding conductor connecting two extraneous conductive parts in accordance with BS 7671?
2.5 mm²
65
In the context of electrical installations, what does SELV stand for?
Separated Extra-Low Voltage
66
Which human sense is primarily used to detect arcing caused by insecure connections during the inspection of electrical installations?
Hearing
67
What is the main purpose of the Electrical Installation Certificate (EIC)?
To certify that the installation complies with BS 7671 and other regulations
68
What is the purpose of supplementary equipotential bonding as additional protection in electrical installations?
To provide additional protection against electric shock
69
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?
IP2X
70
According to Regulations 132.11 and 515.1, what is the requirement regarding the electrical installation's impact on other installations?
It should not cause detriment to other electrical and non-electrical installations.
71
When selecting devices for an electrical installation, which of the following devices are needed according to the provided information?
Fault protective devices, AFDDs, and surge protection devices.
72
What is the purpose of providing a means of isolation at the origin of the installation?
To interrupt the supply on load and ensure safety.
73
In a TN-S or TN-C-S system, which conductors need to be interrupted by the isolator at the origin of the installation?
Only the line conductors.
74
According to the information, which of the following should be provided with a means of switching for safety and maintenance purposes?
Hand dryers and showers.
75
What is the primary function of an isolator?
To switch on/off the supply during no-load conditions.
76
Why is it important to check the manufacturer's information regarding the rating of a device for switching?
To ensure the device is rated for its intended use as a switch.
77
Which level of protection is indicated by the code "IPX7" in equipment used where water is likely to be present?
Protected against immersion in water.
78
When completing a schedule of inspections for an Electrical Installation Certificate, what should be marked in the boxes for compliance?
A tick for compliance
79
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)?
FELV (Functional Extra-Low Voltage)
80
What is the purpose of item 2.1 on the schedule of inspections checklist?
To ensure the generator doesn't power up the supply system.
81
According to item 1.0, what should inspectors check regarding the consumer's isolator?
Its level of basic protection against electric shock.
82
When dealing with a backup generator, what is the importance of an independent earthing system?
It ensures the supply system is not energized if the supply system fails.
83
Which item on the checklist deals with the compatibility of characteristics of means of generation?
Item 2.5
84
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?
To ensure safety by disconnecting the generator in case of power system issues.
85
What is the purpose of the distributor's earthing arrangement according to Regulation 3.1?
To ensure proper earthing based on the supply earthing arrangement.
86
When would supplementary equipotential bonding be provided according to Regulation 3.7?
In situations where disconnection times cannot be met, and an RCD is not feasible.
87
what is the purpose of Class II or equivalent equipment?
To minimize the risk of parts becoming live.
88
What is the primary purpose of RCDs not exceeding 30 mA as specified in Regulation 6.1?
To provide additional protection against fault currents.
89
According to Regulation 7.15, where should all single-pole devices such as fuses or circuit breakers be connected?
To the phase conductor only.
90
What is the purpose of providing protection against electromagnetic effects where cables enter ferromagnetic enclosures (Regulation 7.18)?
To reduce heating effects caused by induced eddy currents.
91
What should be ensured regarding conductor connections, as per Regulation 7.19?
Connections must be tight and correctly located in terminals.
92
What is the purpose of an isolator in an electrical installation?
To disconnect the entire installation or individual circuits.
93
Why is it essential to verify the suitability of equipment in terms of IP and fire ratings?
To protect against external influences and fire hazards.
94
What is the purpose of a firefighter's switch in an electrical installation?
To provide emergency shutdown in the event of a fire.
95
In an electrical installation, what does "undervoltage protection" refer to?
Protection against voltage sags and drops.
96
Why is it important to ensure that cables and conductors are correctly connected and enclosed without undue mechanical strain?
To ensure reliable electrical connections.
97
What does "supplementary bonding" refer to in an electrical installation?
Connecting conductive parts to maintain equal potential.
98
In an electrical installation, why is it necessary to verify the coordination between conductors and overload protective devices?
To ensure that conductors are suitably sized for the intended load.
99
What is the purpose of "additional protection" in an electrical installation?
To provide protection against external influences.
100
What is the primary purpose of testing in an electrical installation?
To confirm the installation's compliance with safety and performance standards.
101
Why is it important to obtain comprehensive and reliable test results during the initial verification of an installation?
Because future periodic testing will likely only be sampling.
102
Which of the following tests relies on the results of continuity tests for conductors?
Insulation resistance.
103
When might the test for "Insulation resistance/impedance of floors and walls" (643.5) be applicable in an electrical installation?
Very rarely, as it is only applicable in specific, unusual installations.
104
Which type of test meter is commonly used for checking the continuity of protective conductors and ring-final circuit conductors?
Low-resistance ohmmeter.
105
What is the minimum requirement for the short-circuit current of a low-resistance ohmmeter used for continuity testing?
200 mA.
105
Which test meter setting is used for insulation resistance testing?
Megohms (MΩ).
106
What is the typical test voltage for insulation resistance testing?
250 V DC, 500 V DC, or 1000 V DC.
107
Which test meter is used to measure earth fault loop impedance and prospective fault current?
Earth fault loop impedance tester.
108
What is the maximum value for earth fault loop impedance typically measured in?
Ohms (Ω).
109
What type of test is performed with an RCD tester?
Residual current device operation.
110
Why is it essential to ensure that the correct scale and setting are selected on a test instrument?
To avoid incorrect test results and ensure safety.
111
What does the number "1" on the left side of a meter's display typically indicate?
An out-of-range measurement.
112
When is it appropriate to use the 'no-trip' function when testing earth fault loop impedance?
Only in circuits with RCDs.
113
What is the purpose of calibrating test equipment?
To ensure the accuracy of measurements.
114
Which of the following is a crucial aspect of ensuring safe and correct use of test instruments?
Understanding the equipment to be used.
115
What does GS38 relate to in electrical testing?
Equipment safety standards for electricians.
116
When should test leads be checked for compliance with Health and Safety Executive Guidance Note GS38?
Regularly, especially before important tests.
117
What type of testing principle is generally used for earth fault loop impedance testers?
Current measurement.
118
Which of the following is an essential step when using test instruments for electrical testing?
Verify the instrument's accuracy with a well-known reference.
119
What type of test is typically performed using an earth electrode resistance test instrument?
Earth electrode resistance.
120
Which safety feature should probes have when conducting electrical testing?
Finger barriers.
121
What is the purpose of the 'no-trip' function in earth fault loop impedance testing?
To prevent tripping of RCDs during testing.
122
Why is it important to choose the correct scale and setting on a test instrument?
To ensure accurate measurements and prevent errors.
123
What is the primary purpose of calibration for test equipment?
To confirm the accuracy of measurements.
124
Which of the following is a critical factor in selecting an appropriate test scale and setting for an instrument?
The specific test being conducted and the expected values.
125
What should be checked regularly to ensure the safe and accurate use of test instruments?
Calibration status and accuracy.
126
In electrical testing, what is the primary function of test leads?
To facilitate safe and secure connections between the instrument and the installation.
127
What is the maximum short-circuit capacity that prospective fault current readings should be compared to?
The rated short-circuit capacity of protective devices.
128
What is the primary reason for conducting continuity tests on electrical conductors?
To confirm the absence of parallel paths.
129
When is it assumed that safe isolation has already been carried out in continuity tests?
For 'dead' tests.
130
Which type of meter is typically used for continuity tests of earthing conductors?
Low-resistance ohmmeter.
131
What additional equipment might be needed for a continuity test of an earthing conductor?
A long wander lead, depending on the length of the earthing conductor.
132
How should test leads be checked before using them for a continuity test?
By checking for visible damage.
133
What is the primary reason for disconnecting the earthing conductor at the MET (main earthing terminal) before conducting a continuity test?
To facilitate safe and accurate measurements.
134
What is the purpose of the 'open lead test' in meter preparation for continuity testing?
To check for damaged leads.
134
Which safety consideration is essential when using long wander leads for continuity testing?
Carrying out a full risk assessment if the building is occupied.
135
Which type of testing method is generally discouraged for initial verification of ring-final circuits?
R2 method.
136
Why is it encouraged to obtain R1 + R2 values for ring-final circuits during initial verification?
To make earth fault loop testing easier.
137
When conducting the figure 8 test for ring-final circuits, what should be interconnected to form the figure 8 configuration?
The lines and circuit protective conductors of both legs.
138
What is the primary purpose of insulation resistance testing in electrical circuits?
To confirm the integrity of insulation.
139
Which voltage is typically used for insulation resistance testing of circuits that operate up to 500 V?
250 V DC.
140
Why is a low test current used during insulation resistance testing?
To reduce the risk of electrocution.
141
What is the purpose of testing insulation resistance in an electrical installation?
To detect damage or deterioration of insulation.
142
What is the main purpose of the continuity test for earthing conductors?
To ensure that the conductor is not broken and is connected to the means of earthing.
143
Which type of meter is typically used for continuity tests of main protective bonding conductors?
Low-resistance ohmmeter.
144
When should the main protective bonding conductors be disconnected before conducting continuity tests?
Always before any continuity tests.
145
What is the primary reason for disconnecting the main protective bonding before conducting continuity tests?
To remove possible parallel paths.
146
Which test method is recommended to verify continuity of main protective bonding conductors?
R1 + R2 method.
147
What is the purpose of the continuity test for circuit protective conductors (cpc) in radial circuits?
To confirm that the cpc is present and effectively connected to all points in the circuit.
148
What is the primary reason for performing a continuity test on ring-final circuits?
To confirm the absence of parallel paths.
149
What type of test is generally discouraged for initial verification of ring-final circuits?
R2 method.
150
Why are the line and neutral conductors disconnected from the distribution board during the figure 8 test for ring-final circuits?
To confirm that the ring is wired correctly.
151
What is the primary purpose of insulation resistance testing in electrical circuits?
To verify the quality of insulation.
152
Which voltage is typically used for insulation resistance testing of circuits that operate over 500 V?
1000 V DC.
153
Why is insulation resistance testing essential on construction sites?
To detect damage to cable insulation caused by various construction activities.
154
What is the primary reason for using low test currents during insulation resistance testing?
To reduce the risk of damage to the insulation.
155
When should insulation resistance testing be performed on electrical installations?
During initial verification and periodic inspection.
156
What does an insulation resistance test aim to detect in electrical installations?
Deterioration or damage to insulation.
157
What additional equipment is needed when performing the insulation resistance test for general lighting and power circuits?
Connector block
158
Why is it important to remove or disconnect loads before conducting the insulation resistance test?
To ensure correct test values
159
Which electronic switching devices should be disconnected and bridged out during the insulation resistance test?
Dimmer switches
160
In terms of health and safety considerations, why should you release the test button on the circuit tester before moving the probes?
To discharge any stored energy in the cables
160
When is it reasonable to carry out the insulation resistance test on existing circuits during a Periodic Inspection and Test?
Always when required by the regulations
161
What is recorded as the result of the insulation resistance test for an entire installation?
One result per column covering all circuits
162
According to BS 7671, what is the minimum insulation resistance value required for circuits with a nominal voltage above 500 V?
1.0 MΩ
163
Why might the overall insulation resistance value of an installation be lower than expected?
Because circuits are in parallel
164
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?
8.33 MΩ
165
What is the purpose of the insulation resistance test for Separation of circuits, such as SELV and PELV?
To check the functionality of electrical separation devices
166
What is the minimum acceptable insulation resistance value for circuits undergoing the Separation of circuits test?
1.0 MΩ
167
Why is it essential to isolate the primary source circuit before conducting the Separation of circuits test?
To ensure the secondary circuit is not in contact with the primary circuit
168
What should be done if any result below 1 MΩ is recorded during the Separation of circuits test?
Investigate and rectify inadequate separation
169
What is the primary reason for performing the test for Separation of circuits?
To ensure circuits relying on electrical separation are reliably separated
170
What additional equipment is needed for testing insulation resistance in general lighting and power circuits?
Test load resistor
171
What is the purpose of bridging out electronic switching devices like dimmer switches during insulation resistance testing?
To avoid damaging them
172
Why should the supply be isolated when testing insulation resistance?
To avoid electrocution
173
In which situations should you test between live and earth only during insulation resistance testing?
When equipment is reasonably practical to isolate
174
When should switches be in the closed (on) position during insulation resistance testing?
To allow readings throughout the entire circuit
175
What is the term used to describe something located in such a position that expensive or unavailable specialist equipment is needed to isolate it?
Not reasonably practical
176
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?
1.0 MΩ
176
What can affect insulation resistance readings in an otherwise healthy circuit?
Multiple resistances in parallel
177
What is the method of determining the separation of circuits such as SELV or PELV circuits?
Inspection
178
What is the primary purpose of earth electrode resistance testing?
To check the integrity of the earth electrode
179
What meter is typically used for earth electrode resistance testing?
Low-resistance ohmmeter
180
What is the primary consideration for health and safety during earth electrode resistance testing?
Avoiding exposure to live terminals
181
How are the average earth electrode resistance test readings calculated?
Averaging the three readings
182
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?
0.54 Ω
183
Why are calculated values of Zs considered the worst case for protective devices?
Because they take parallel paths into account
184
In which situations is a live EFLI test likely to produce lower values than calculated values?
When testing a ring-final circuit
185
What type of circuit protection should be consulted for protection under short-circuit conditions if EFLI values exceed the limits for protective devices?
Adiabatic equation calculations
186
What is the purpose of testing supply polarity?
To confirm the proper connection of line and neutral
187
When should you test supply polarity in an installation?
Only during initial verification
188
What method is used to determine supply polarity during testing?
Measurement using a voltmeter
189
What is the primary purpose of safely disconnecting devices during testing?
To ensure devices don't explode
190
Why is it essential to establish the maximum possible fault current for an installation?
To ensure protective devices can handle fault currents
190
What is the rated short-circuit capacity called for fuses, circuit breakers, and RCBOs?
Breaking capacity
191
What should be done if a test instrument requires three leads to carry out the prospective fault current test?
Double up the earth and neutral leads
192
When is it ideal to isolate the supply before conducting the prospective fault current test?
Only for initial verification
193
What type of test is performed between L and N in single-phase installations?
Prospective short-circuit current (PSCC)
194
What is recorded as the result for a single-phase prospective fault current test?
The highest value of L-N and L-E tests
195
How can you verify that prospective fault current values are within acceptable limits?
Check the rated short-circuit capacities of protective devices
196
Why is it important to conduct phase sequence testing?
To check if the phases are correctly wired
197
What type of meter is typically used for phase rotation testing?
Phase rotation tester
198
When should phase rotation testing be conducted?
After energizing phase-sequence sensitive equipment
199
What is the primary purpose of testing RCDs under simulated fault current conditions?
To verify the functionality of RCDs
200
What should the RCD tester be set to when testing RCDs?
The residual current rating of the RCD
201
Why should the RCD test be conducted on the load side of the RCD?
To put a fault into the earthing system
202
What is the expected result when testing RCDs at 0.5 times IΔn?
The RCD should not trip
203
What is the maximum acceptable disconnection time for general-purpose RCDs?
300 milliseconds
204
When is testing for voltage drop typically not required during initial verification?
When the installation is designed correctly
205
What is the maximum acceptable voltage drop for power circuits in installations connected to a public supply?
5% of the supply voltage
206
Which certificate demonstrates that electrical installation work has been designed, constructed, inspected, and tested in accordance with BS 7671?
Electrical Installation Certificate
207
What should be included in the Operation and Maintenance (O&M) manual for electrical and electronic equipment?
Manufacturer's documentation
208
What is the primary reason for checking the sequence of three-phase supply conductors?
To verify that machines rotate in the correct direction
209
What should be included in an Operation and Maintenance (O&M) manual for electrical and electronic equipment?
Manufacturer's documentation
210
Which certificate is appropriate when minor electrical installation work has been carried out?
Before voltage drop testing
211
Why is it important to ensure that the Schedule of Circuit Details and the Schedule of Test Results are completed with satisfactory outcomes?
To demonstrate compliance with BS 7671
212
What must be done if the voltage drop in a circuit exceeds permitted values during testing?
Correct the circuit before certification
213
Which document provides information on each circuit in an electrical installation, including circuit design and test results?
Schedule of Circuit Details
214
What should you do if equipment is found to be phase-sequence sensitive during phase rotation testing?
Check the manufacturer's handbook
215
Which type of RCD should be installed for additional protection requirements?
Time-delay (S type) RCD
216
What is the primary purpose of the voltage drop test?
To ensure correct equipment operation
217
When should testing of RCDs be conducted every six months?
When clocks are reset for daylight saving time changes
218
What is the primary purpose of the Schedule of Inspections?
To demonstrate that no faults were found
219
What is the purpose of checking phase rotation in an installation?
To ensure that machines rotate correctly
219
Which certificate should be provided to the customer to confirm that electrical installation work complies with BS 7671?
Electrical Installation Certificate
220
Which certificate is used when extensive electrical installation work has been carried out?
Electrical Installation Certificate
221
What does the term "adiabatic equation calculation" refer to in the context of electrical testing?
A calculation to assess the adequacy of cable size
222
Which document is used to provide proof of compliance with BS 7671 for minor electrical installation work?
Minor Electrical Installations Works Certificate
223
When should the RCD test be performed in relation to earth fault loop impedance testing?
After earth fault loop impedance testing
224
What is the primary purpose of performing a phase rotation test?
To verify that machines rotate correctly
225
What information should be included in the Operation and Maintenance (O&M) manual for electrical and electronic equipment?
Manufacturer's documentation
