NICEIC Inspection, Testing and Certification to BS7671:2018+A2:2022 Edition 2022 (PDF)

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About the book:

Publisher: NICEIC
Place of Publication: United Kingdom
Pages: 286
Edition: 2022
Language: English
Size: 102 Mb

Complies with BS7671:201 8+A2:2022.

Content:

CHAPTER 1. Introduction 1
1.1 Aims and objectives 3
1.2 Scope 4
1.3 Arrangement of the Guide 4
1.4 The purpose of inspection, testing and certification or reporting 7
1.5 NICEIC certificates and reports 7
1.5.1 NICEIC online certification service 8
1.6 The inspector 9
1.7 Safe working procedure 10
1.8 Test equipment 12
CHAPTER 2. The Electrical Installation Certificate 1 3
General 15
Requirements 17
Additions or alterations 17
Continuation sheets 19
2.0 Compilation of the certificate 19
2.1 Part 1: Details of the contractor, client and installation 19
2.2 Part 2: Details of the electrical work covered by this installation certificate 21
2.2.1 Description and extent of the installation covered by this certificate 21
2.3 Part 3: Comments on the existing installation 22
2.4 Part 4: Declaration for the electrical installation work 22
2.4.1 Single declaration for design, construction, inspection and testing 23
2.4.2 Separate declarations for design, construction and inspection and testing (EIC only) 25
2.4.3 Recommendation for next inspection  28
2.5 Part 5: Supply characteristics and earthing arrangements 29
2.5.1 System type and earthing arrangements  29
2.5.2 Supply protective device 30
2.5.3 Number and type of live conductors 30
2.5.4 Nature of supply parameters 31
2.6 Part 6: Particulars of installation referred to in this certificate 33
2.6.1 Maximum demand (load) 33
2.6.2 Means of Earthing 33
2.6.3 Main protective conductors 34
2.6.4 Main protective bonding connections 34
2.6.5 Main switch / Switch -fuse / Circuit-breaker / RCD 35
2.7 Part 7: Schedule of items inspected 36
CHAPTER 3. The Minor Electrical Installation Works Certificate 37
General 40
3.1 Compilation of the certificate 42
3.1.1 Part 1: Details of the contractor, client and installation 42
3.1.2 Part 2: Details of the minor works, supply characteristics and earthing arrangements 43
3.1.3 Part 3: Circuit details 45
3.1.4 Part 4: Test results for the circuit altered or extended 46
3.1.5 Part 5: Declaration 49
General 55
Safety 56
Requirements 58
4 Compiling the form 60
4.1 Part 1: Details of the contractor, client and installation 60
4.2 Part 2: Purpose of the Report 61
4.3 Part 3: Summary of the condition of the installation 62
4.4 Part 4: Declaration 63
4.5 Part 5: Observations 65
4.6 Part 6: Details and limitations of the inspection and testing 70
4.7 Part 7: Supply characteristics and earthing arrangements 72
4.8 Part 8: Particulars of installation referred to in this Report 73
4.9 Part 10: Schedules and additional pages 73
CHAPTER 5. The Schedule of Circuit Details and Test Results (for new installation work and condition reporting)  75
5.1 General 77
5.2 Schedule of circuit details 78
5.2.1 Circuit number and description 78
5.2.2 Type of wiring 78
5.2.3 Reference methods 79
5.2.4 Number of points served 79
5.2.5 Circuit conductors (number and csa) 80
5.2.6 Maximum disconnection time permitted by BS 7671 80
5.2.7 Overcurrent protective device 81
5.2.8 RCD 82
5.2.9 Distribution board (DB) details 83
5.2.9.1 The distribution board (DB) details required here must be completed in every case 83
5.2.9.2 To be completed only if the DB is not connected directly to the origin of the installation 84
5.3 Schedule of test results 86
5.3.1 Continuity (Ω) 86
5.3.2 Ring final circuits only (measured end-to-end)  86
5.3.3 All circuits (complete at least one column)
5.3.4 Insulation resistance  87
5.3.5 Polarity 88
5.3.6 Maximum measured earth fault loop impedance, Zs 89
5.3.7 RCD operating time  89
5.3.8 Test buttons 90
5.3.9 Comments and additional information 90
5.3.10 Circuits / equipment vulnerable to damage when testing  91
5.3.11 Tested by
5.3.12 Test instruments
5.4 Continuation sheets 92
CHAPTER 6. The Schedule of Items Inspected for New Installation Work 95
General 101
Initial inspection of new work 101
6.0 The Schedule of Items Inspected 102
6.1 External condition of electrical intake equipment (visual inspection only) 103
6.2 Parallel or switched alternative sources of supply 104
6.2.1 Presence of adequate arrangements where generator to operate as a switched alternative 105
6.2.2 Presence of adequate arrangements where generator to operate in parallel with the public supply 105
6.3 Protective measure: Automatic disconnection of supply (ADS) 107
6.3.1 Distributor's earthing arrangement or installation earth electrode arrangement 107
6.3.2 Earthing conductor and connections 107
6.3.3 Main protective bonding conductors and connections 108
6.3.4 Earthing/bonding labels at all appropriate locations 110
6.3.5 Accessibility of earthing/bonding connections 110
6.3.6 Functional extra-low voltage (FELV)- requirements satisfied 111
6.3.7 Reduced low voltage (RLV) - requirements satisfied  111
6.4.1 Insulation of live parts 112
6.4.2 Barriers or enclosures 112
6.4.4 Placing out of reach  114
6.5 Additional protection 115
6.5 Additional protection 115
6.5.1 RCDs not exceeding 30 mA operating current, as specified 115
6.5.2 Supplementarybonding 116
6.6 Protective measures other than ADS 117
6.6.1 SELV and PELV 117
6.6.2 Double or reinforced insulation 119
6.6.3 Electrical separation for one item of equipment  120
6.6.4 Other methods of protection
6.6.4.1 Non-conducting location/Earth-free local equipotential bondi
6.6.4.2 Electrical separation for the supply to more than one item of
6.7 Distribution equipment 122
6.7.1 Adequacy of working space/accessibility 123
6.7.2 Security of fixing 124
6.7.3 Insulation of live parts not damaged during erection 124
6.7.4 Adequacy / security of barriers 124
6.7.5 Suitability of enclosures for IP and fire ratings 124
6.7.6 Enclosures not damaged during installation 124
6.7.7 Presence and effectiveness of obstacles 124
6.7.8 Presence and operation (functional check) of main switch(es) 125
6.7.9 Components are suitable according to assembly manufacturer’s instructions or literature 125
6.7.10 Operation of main switch(es), circuit-breakers, RCDs and AFDDs to prove functionality 125
6.7.11 Protection by an RCD 125
6.7.12 RCD(s) provided for fault protection, where specified 126
6.7.13 RCD(s) provided for protection against fire, where specified "TT"
6.7.14 RCD(s) provided for additional protection, where specified 128
6.7.15 Unwanted tripping 128
6.7.16 Confirmation that overvoltage protection (SPDs) provided, where specified 129
6.7.17 Indication of SPDs continued functionality confirmed 130
6.7.18 Selection of protective device(s) and base(s): correct type and rating 130
6.7.19 Single-pole protective devices in line conductors only 130
6.7.20 Protection against mechanical damage where cables enter equipment 130
6.7.21 Protection against electromagnetic effects where cables enter ferromagnetic enclosures 131
6.7.22 Confirmation that ALL conductor connections, including connections to busbars are correctly located in terminals and are tight and secure 131
6.8.1 Identification of conductors 132
6.8.2 Cables correctly supported throughout, with protection against abrasion 134
6.8.3 Examination of cables for signs of mechanical damage during installation 135
6.8.4 Examination of insulation of live parts, not damaged during erection 135
6.8.5 Non-sheathed cables protected by enclosure in conduit, ducting or trunking 136
6.8.6 Suitability of containment systems (including flexible conduit) 136
6.8.7 Correct temperature rating of cable insulation 138
6.8.8 Adequacy of cables for current-carrying capacity with regard to the type and nature of installation 138
6.8.9 Adequacy of protective devices: type and fault current rating for fault protection 138
6.8.10 Adequacy of RCDs: type and current rating 139
6.8.11 Arc fault detection devices provided for protection against fire, where specified 139
6.8.12 Presence and adequacy of circuit protective conductors 140
6.8.13 Coordination between conductors and overload protective devices 140
6.8.14 Wiring systems and cable installation methods / practices appropriate to the type and nature of installation and external influences 140
6.8.15 Cables concealed under floors, above ceilings, in walls/partitions, adequately protected against damage 141
6.8.16 Cables in walls/partitions installed in prescribed zones 142
6.8.17 Provision of additional protection by RCDs having rated residual operating current (lAn) not exceeding 30 mA 144
6.8.18 Provision of fire barriers, sealing arrangements so as to minimise the spread of fire 145
6.8.19 Segregation / separation of Band 1 (ELV) and Band II (LV) circuits 146
6.8.20 Cables segregated/sepa rated from non-electrical services 146
6.8.21 Termination of cables at enclosures 147
6.8.22 Suitability of circuit accessories for external influences 147
6.8.23 Circuit accessories not damaged during erection 148
6.8.24 Single-pole devices for switching or protection in line conductors only 148
6.8.25 Adequacy of connections, including cpcs, within accessories and at fixed and stationary equipment 148
6.9 Isolation and switching 148
6.9.1 Isolators 150
6.9.2 Switching off for mechanical maintenance 151
6.9.3 Emergency switching off 153
6.9.4 Functional switching 155
6.9.4.1 Presence of appropriate devices 155
6.9.4.2 Correct operation verified (functional check) 155
6.10 Current-using equipment (permanently connected) 155
6.10.1 Suitability of equipment in terms of IP and fire ratings 156
6.10.2 Enclosure not damaged/deteriorated during installation so as to impair safety  156
6.10.3 Suitability for the environment and external influences 156
6.10.4 Security of fixing  156
6.10.5 Cable entry holes in ceilings above luminaires, sized or sealed so as to restrict the spread of fire 157
6.10.6 Recessed luminaires (downlighters) 157
6.10.7 Provision of undervoltage protection 159
6.10.8 Provision of overload protection, where specified 159
6.10.9 Adequacy of working space / accessibility to equipment 159
6.11 Identification and notices 160
6.11.1 Presence of PCD six-monthly test notice, where required 160
6.11.2 AFDD six-monthly test notice, where required 160
6.11.3 Presence of diagrams, charts or schedules at or near each distribution board, where required 160
6.11.4 Presence of alternative / additional supply warning notices 162
6.11.5 Presence of next inspection recommendation label  162
6.11.6 Presence of other required labelling 163
6.11.7 Presence of labels to indicate the purpose of switchgear and protective devices 163
6.11.8 Warning notice posted in situation where live parts cannot be isolated by the operation of a single device 164
6.11.9 The circuit or part thereof to be disconnected clearly identified by location and/or durable marking 164
6.11.10 The installation, circuit or part thereof to be disconnected clearly identified by location and/or durable marking 164
6.12 Location(s) containing a bath or shower 164
6.12.1 Additional protection for all low voltage (LV) circuits by RCD not exceeding 30 mA 166
6.12.2 Where used as a protective measure, requirements for SELV or PELV met 166
6.12.3 Shaver supply units comply with BS EN 61558-2-5 formerly BS 3535 166
6.12.4 Presence of supplementary bonding conductors, unless not required by BS 7671 167
6.12.5 Low voltage (e.g. 230 V) socket-outlets sited at least 2.5 m from zone 1 168
6.12.6 Suitability of equipment for external influences for installed location in terms of IP rating 168
6.12.7 Suitability of accessories and controlgear etc. for a particular zone 169
6.12.8 Suitability of current-using equipment for particular position within the location 170
6.13 Other special installations or locations 171
6.14 Prosumer's installations 171
6.15 Schedule of items inspected by 171
CHAPTER 7. The Inspection Schedule for Condition Reporting 173
General 175
7.0 Completionof the ‘Scheduleof Items Inspected’ 176
7.1 Intake equipment (visualinspectiononly) 177
7.2 Presenceof adequate arrangementsfor parallel or switched alternative sources 178
7.3 Methods of protection 178
7.3.1. Automatic disconnectionof supply (ADS) 178
7.3.2 Other methodsof protection 179
7.4 Distribution equipment includingconsumerunits and distributionboards 180
7.5 Distribution circuits 182
7.6 Final circuits 183
7.7 Isolationand switching 184
7.8 Current-usingequipment (permanentlyconnected) 185
7.9 Speciallocationsand installationscoveredby this Report 187
7.9.1 Location(s) containinga bath or shower 187
7.9.1.1 Additional protection by RCD having rated residual operating current not exceeding 30 mA for all low voltage (LV) circuits serving the location or passing through zones 1 and / or 2 of the location 187
7.9.1.2 Where used as a protective measure, requirements for
SELV or PELV circuits 188
7.9.1.3 Shaver supply units complying with BS EN 61558-2-5 formerly BS 3535 188
7.9.1.4 Presence of supplementary protective equipotential bonding conductors, unless not required by BS 7671: 2018  188
7.9.1.5 Low voltage (e.g.230 volt) socket-outlets sited at least 2.5 m from zone 1 189
7.9.1.6 Suitability of equipment for external influences for installed location in terms of IP rating 189
7.9.1.7 Suitability of accessoriesand control gear etc. for a particular zone 189
7.9.2 Other specialinstallationsor locations 189
7.10 Prosumer's low voltage installation 189
7.11 Scheduleof items inspected 190
CHAPTER 8. Testing 191
8.1 Safety 194
8.2 Instrument accuracy BHHB 195
8.3 Required tests 197
8.3.1 Sequence of testing- Initial verification 197
8.3.2 Sequence of testing - for condition reporting 198
8.4 Continuity of conductors 200
8.4.1 Continuity testing of protective conductors, including protective bonding conductors 201
8.4.1.1 The R2 (wander lead) method 201
8.4.1.2 The (R1 + R2) method 204
8.4.2 Continuity of the live conductors of ring final circuits 206
8.5 Insulation resistance 209
8.5.1 Details of installed equipment vulnerable to testing 211
8.5.2 The test procedure 211
8.5.2.1 Insulation resistance testing between live conductors 211
8. 5.2.2 Insulation resistance between live conductors and Earth 212
8.5.3 Protection by SELV, PELV or by electrical separation 213
8.5.3.1 Test requirements for SELV circuits 214
8.5.3.2 Test requirements for PELV circuits 215
8.5.4 Test requirements for electrical separation 215
8.5.4.1 Insulation resistance I impedance of floors and walls 216
8.6 Polarity 216
8.7 Installation earth electrode resistance, (RA ) 217
8.7.1 Measurement of installation earth electrode resistance using a proprietary tester 217
8.7.2 Measuring RA using an earth fault loop impedance test instrument 219
8.7.3 Comparing the results of earth electrode resistance testing obtained using different methods 219
8.7.4 Verification of earth electrode test results 220
8.8 Live testing - Polarity of incoming supply 221
8.8.1 TT and TN-S systems 221
8.8.2 TN-C-S system 222
8.9 Protection by automatic disconnection of supply (ADS) 223
8.10 Measurement of external earth fault loop impedance (Ze) 224
8.10.1 Conducting an external earth fault loop impedance test 225
8.10.2 Measurement of Ze at a single-phase board 225
8.11 Measurement of maximum prospective fault current 227
8.11.1 Determining prospective fault current 228
8.11.1.1 Single-phase installations
8.11.1.2 Three-phase installations
8.11.2 Maximum short-circuit breaking capacities of protective devices 231
8.12 Measurement of Earth fault loop impedance (Zs) 232
8.12.1 The earth fault loop impedance path 233
8.12.2 The Procedure for measuring Zs with a loop impedance test instrument 234
8.12.3 Determination of Zs using (R1 + R2) measured values 235
8.12.4 Verifying earth fault loop impedance test results 237
8.12.5 Verification of circuits connected to TN systems 238
8.12.6 Verification of circuits connected to TT systems 240
8.13 Additional protection 241
8.13.1 Additional protection by RCDs 241
8.13.2 Supplementary protective equipotential bonding 241
8.14 Operation of residual current devices 242
8.14.1 RCD testing 242
8.14.2 Test procedure 243
8.14.3 Operation of the integral test button 244
8.15 Verification of phase sequence 245
8.16 Functional testing of assemblies 246
8.17 Verification of voltage drop 246
8.17.1 Evaluation of voltage drop by measurement 247
APPENDICES 249
APPENDIX A Safe isolation
A1 Safe Isolation 251
APPENDIX B Test equipment
B1 Test equipment 256
APPENDIX C Minor Electrical Installation Works Certificate
C1 Minor Electrical Installation Works Certificate (MEIWC) 258
APPENDIX D Recommended maximum periods between inspection and testing
D1 Recommended Initial Frequencies of Inspection of
Electrical Installations 259
APPENDIX E Extraneous-conductive-parts
E1 Extraneous-conductive-parts 260
APPENDIX F International Protection (IP) Codes
F1 International Protection (IP) Codes 262
APPENDIX G Examples of the use of Classification codes
G1 Examples of the use of Classification codes 263 i
APPENDIX H Resistance of copper conductors
H1 Resistance of copper conductors 265
H1.1 Conductor resistance values at a conductor temperature other than 20 °C 266
H1.2 Calculation of conductor resistance at 30 °C 266
H1.3 Conductor resistance at 70 °C 267
H1.4 Further information on conductor temperature correction multiplication factors 267

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