IET Guidance Note 1 Selection & Erection BS7671:2018+A2:2022 9th Edition 2022 (PDF)

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About the book:

Publisher: IET
Place of Publication: United Kingdom
Pages: 242
Edition: 2022
Language: English
Size: 112 Mb

Complies with BS7671:201 8+A2:2022.

Content:

Cooperating organizations 9
Acknowledgements 10
Preface 11
Introduction 13
Section 1 General requirements 15
1.1 General 15
1.2 Equipment 15
1.3 The Electricity at Work Regulations 1989 16
1.4 The Construction (Design and Management) Regulations 2015 16
1.5 Building Regulations 17
1.5.1 The Building Regulations 2010 (England and Wales) 17
1.5.2 The Building (Scotland) Regulations 2004 18
1.5.3 Building Regulations in Northern Ireland 19
1.6 Competence 20
Section 2 Selection and erection of equipment 21
2.1 General 21
2.2 Compliance with standards 21
2.2.1 European Norms (ENs) 21
2.2.2 Harmonization Documents (HDs) 21
2.3 Operational conditions and external influences 22
2.3.1 Motors 23
2.3.2 Electromagnetic compatibility (EMC) 23
2.3.3 Harmonics 23
2.4 Identification and notices 24
2.4.1 Cables and conductors 24
2.4.2 Circuits 25
2.4.3 Switchgear 25
2.4.4 Warning notices 26
2.4.5 Other notices 26
2.4.6 Safety signs 26
2.4.7 Notices and identification labels 26
2.5 Mutual detrimental influence 28
2.6 Compatibility 28
2.7 Functional earthing 29
2.8 Low voltage (LV) switchgear and controlgear assemblies 30
2.8.1 Forms of separation 30
2.8.2 General 32
Section 3 Protection against overcurrent,
electric shock and overvoltage 35
3.1 Protection against electric shock: overview 35
3.1.1 Automatic disconnection of supply (ADS) 36
3.1.2 Basic protection 36
3.1.3 Fault protection 36
3.1.4 Additional protection 36
3.2 Protective devices 37
3.3 Overcurrent protective devices 37
3.3.1 Motor circuits 38
3.4 Fuses 39
3.5 Circuit-breakers 40
3.5.1 Circuit-breakers for applications not exceeding 440 V AC
3.5.2 Circuit-breakers for applications not exceeding 40
1,000 VAC (MCCBs) 41
3.5.3 Circuit-breakers - general 41
3.6 Insulation monitoring devices (IMDs) 43
3.7 Residual current devices (RCDs) 43
3.7.1 Terminology 44
3.7.2 A wide choice of devices 45
3.7.3 Selectivity (discrimination) 48
3.7.4 Additional protection 51
3.7.5 Location of RCDs 51
3.7.6 Selection of types of RCD 51
3.7.7 TT systems 51
3.7.8 Two distinct categories 52
3.7.9 Limitations and precautions 53
3.7.10 Unwanted tripping 54
3.8 Automatic disconnection of supply (ADS) 54
3.8.1 Types of protective conductor 56
3.8.2 Protective equipotential bonding 56
3.8.3 Sizing of earthing conductor and main protective bonding conductors 58
3.8.4 Earthing of flush metal accessory boxes 60
3.9 Protection against voltage disturbances
3.9.1 Disturbances due to earth faults in the high voltage system and due to faults in the low voltage system 61
3.9.2 Protection against overvoltages of atmospheric origin or due to switching 62
3.9.3 Equipment rated impulse voltages 62
3.9.4 Overvoltage control 64
3.9.5 Switching overvoltages 64
3.9.6 Surge protective devices (SPDs) 64
3.10 Protection against arcing and arc faults - arc fault detection devices (AFDDs) 69
Section 4 External influences 71
4.1 General 71
4.2 Ambient temperature (AA) 72
4.3 Solar radiation (AN) and ultraviolet radiation 72
4.4 The IP and IK codes 73
4.5 Presence of water (AD) or high humidity (AB) 73
4.6 Presence of solid foreign bodies (AE) 74
4.7 Presence of corrosive or polluting substances (AF) 75
4.8 Impact (AG), vibration (AH) and other mechanical stresses (AJ) 76
4.9 Presence of fauna (AL), flora and/or mould growth (AK) 76
4.10 Potentially explosive atmospheres 77
4.11 Precautions where particular risks of fire exist 77
4.11.1 Protected escape routes 78
4.11.2 Locations with risks of fire due to the nature of processed or stored materials 79
4.11.3 Locations constructed of combustible materials 80
4.11.4 Fire propagating structures 82
4.11.5 Locationsof national,commercial,industrialor public significance 82
Section 5 Installation of cables 83
5.1 Cable selection 83
5.1.1 Conduit, trunking and ducting systems standards 84
5.2 Cables concealed in structures 86
5.2.1 Walls and partitions 86
5.3 Cable routes and livestock 89
5.4 Capacities of conduit and trunking 89
5.5 Selection of cables and wiring systems with low emission of smoke and corrosive gases when affected by fire 89
5.6 Buried cables 90
5.7 Sealing and fire stopping 95
Section 6 Sizing of cable 97
6.1 Current-carrying capacity and voltage drop 97
6.2 Diversity 98
6.3 Neutral conductors 98
6.4 Voltage drop in consumers' installations 99
Section 7 Other influences 101
7.1 Electrical connections 101
7.2 Cables in contact with thermal insulation 103
7.2.1 Typical cable sizes 104
7.3 Mutual or individual deterioration 104
7.4 Proximity of wiring systems to other services 105
7.5 Plasticiser migration from PVCinsulation 106
7.6 Section 444 Measures against electromagnetic disturbances 107
7.6.1 Introduction to electromagnetic compatibility (EMC) 107
7.6.2 EMC legislation 107
7.6.3 Scope of BS 7671 Section 444 108
7.6.4 Section 444 and general EMC advice 108
7.6.5 Recommended further reading 116
7.7 Auxiliary circuits 116
7.7.1 Introduction 116
7.7.2 Content of Section 557 117
7.7.3 Power supplies and configuration 118
7.7.4 Current transformers and voltage transformers 119
7.7.5 Connection to the main circuit 119
Sections Installation of equipment 121
8.1 Earthing requirements for the installation of equipment having high protective conductor currents 121
8.1.1 Scope 121
8.1.2 The risks 122
8.1.3 Equipment 123
8.1.4 Labelling 123
8.1.5 Circuits for fixed equipment 123
8.1.6 Ring circuits 124
8.1.7 Radial circuits 124
8.1.8 Busbar systems 125
8.1.9 RCDsand high protective conductor currents 126
8.2 Water heating 126
8.3 Safety services 126
8.4 Other equipment 127
8.5 Luminaires 128
8.5.1 Scope 128
8.5.2 General 128
8.5.3 Protection against fire 129
8.5.4 Transformers, convertors and controlgear 130
8.5.5 Independent lamp controlgear 130
8.5.6 Stroboscopic effect 131
8.6 Highway power supplies, street furniture and external lighting installations 131
8.6.1 Protection against electric shock 131
8.6.2 Equipment doors and access covers 132
8.6.3 Devices for isolation and switching 132
8.6.4 Protection and identification of cables 132
8.6.5 External influences 133
8.6.6 References 133
8.7 Extra-low voltage lighting installations 133
8.7.1 Protection against overcurrent 133
8.7.2 Isolation and switching 133
8.7.3 Protection against fire 1 34
8.7.4 Nature of processed or stored materials 134
8.7.5 Fire risk of transformers and convertors 134
8.7.6 Fire risk from short-circuiting of uninsulated conductors 135
8.7.7 Bare conductors 135
8.7.8 Suspended systems 136
8.7.9 Cross-sectional area (csa) of conductors 136
8.8 Selection and erection in relation to operation and maintainability 136
8.9 Low voltage assemblies according to the BS EN 61439 series 137
Appendix A Cable capacities of conduit and trunking 139
A1 General 139
A2 Single-core thermoplastic (PVC) insulated cables in straight runs of conduit not exceeding 3 m in length 140
A3 Single-core thermoplastic (PVC) insulated cables in straight runs of conduit exceeding 3 m in length, or in runs of any length incorporating bends or sets 141
A4 Single-core thermoplastic (PVC) insulated cables in trunking 143
A5 Other sizes and types of cable in conduit or trunking, including flexible conduit 144
A6 Background to the tables 145
Appendix B Degrees of protection provided by enclosures 147
B1 IP code for ingress protection 147
B1.I General 147
B1.2 Additional letter 149
B1.3 Supplementary letter 149
B1.4 Product marking 150
B1.5 Drip-proof and splashproof 150
B2 IK code for impact protection 151
B2.1 General 151
Appendix C Standard circuit arrangements and the provision of socket-outlets 153
C1 General 153
C2 Final circuits using socket-outlets and fused connection units complying with BS 1363 153
C2.1 Layout 153
C2.2 Circuit protection 155
C2.3 Conductor size 155
C2.4 Spurs 155
C2.5 Permanently connected equipment 156
C3 Radial final circuits using 16 A socket-outlets complying with BSEN 60309-2 156
C3.1 General 156
C3.2 Circuit protection 156
C3.3 Conductor size 156
C3.4 Types of socket-outlet 156
C4 Cooker final circuits in household premises 157
C5 Water heating and electric shower final circuits in household premises 157
C6 Provision of socket-outlets 157
C6.1 Number of socket-outlets 158
C6.2 Sinks and electrical accessories 159
C7 Mounting heights of accessories 159
C7.1 BS 8300-2:2018 Design of an accessible and inclusive built environment - Part 2 Buildings - Code of practice 160
Appendix D Limitation of earth fault loop impedance for compliance with Regulation 543.1.1 163
D1 Selection of a circuit protective conductor (cpc) 169
D2 Steel conduit and trunking 170
D3 Steel-wire armoured cables 171
D4 Mineral insulated cables 175
D5 Thermoplastic (PVC) insulated and sheathed cables to BS 6004 177
Appendix E Resistance and impedance of copper and aluminium conductors under fault conditions 179
E1 Verification 182
E2 Mineral insulated cable with copper sheath 183
E3 Steel-wire armour, steel conduit and steel trunking 185
Appendix F Selection and erection of wiring systems 187
F1 General 187
F1.1 Construction Products Regulation 188
F2 British Standards 196
F3 Firestopping 196
Appendix G Notes on methods of support for cables, conductors and wiring systems 199
G1 Cable supports generally 199
G2 Particular applications 200
G3 Overhead wiring 200
G4 Conduit and cable trunking 204
G5 Conduit bends 205
G6 Spacing of supports for busbar trunking systems 205
G7 Cable supports for life safety systems 206
Appendix H Maximum demand and diversity 207
Appendix I Permitted protective conductor currents 211
Appendix J Standard symbols, units and graphical symbols for general electrical purposes 213
J1 General symbols 213
J1.1 SI derived units 215
J2 Diagrams and documentation 215
J3 Symbols for use in schematic wiring diagrams 217
J3.1 Making and breaking current 218
J3.2 Isolating 218
J3.3 Making, breaking and isolating 218
J3.4 Meters 218
J4 Common symbols for use on layout diagrams or plans 219
Appendix K Addresses of associated bodies and industry contacts 221
Index 227

Tags: Guidance Note 1 bs7671 pdf, Guidance Note 1-2022, Guidance Note 1+a2 pdf, Guidance Note 1 Selection & Erection pdf