Guidance Note 5 Protection Against Electric Shock to BS 7671:2018+A2:2022 9th Edition 2022 (PDF)

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About the book:

Publisher: IET
Place of Publication: United Kingdom
Pages: 166
Edition: 2022
Language: English
Size: 80Mb

Updated to BS7671:2018+A2:2022 lET Wiring Regulations.

Amendment 2 to BS 7671:2018 (18th Edition of the IET Wiring Regulations), which introduces a new requirement for Arc Fault Detection Devices (AFDDs), updated requirements for the fire safety design for buildings and a new chapter on Prosumer’s Low Voltage Electrical Installations.

Amendment 2 comes into effect immediately when published on 28th March 2022 and the previous version, BS 7671:2018+A1:2020, will be withdrawn six months later.

Significant changes include:

- a new requirement for Arc Fault Detection Devices (AFDDs) in some AC final circuits for installations in some types of higher risk residential buildings;
- the requirement for the fire safety design of buildings to be documented where specific conditions of external influence exist, such as protected escape routes and locations with risk of fire;
- method for determining the requirement to provide overvoltage protection;
- changes to identification, labels and notices, such as for consumer units, affecting how safety information is provided to the user of the electrical installation;
- a chapter on Prosumer’s Low Voltage Electrical Installations, in a new part, Part 8.

Content:

Cooperating organizations 6
Acknowledgements 7
Preface 8
Introduction 9
Chapter 1 Statutory Regulations and The Wiring Regulations 11
1.1 Statutory Regulations l l
1.2 The Electricity at Work Regulations 1 989 (EAWR) as amended 11
1.3 The Electricity Safety, Quality and Continuity Regulations 2002 (ESQCR) 12
1.4 The Building Regulations 14
1.5 The Construction (Design and Management) Regulations 2015 16
Chapter 1 Electric shock and protective measures
2.1 Electric shock 17
2.2 Physiology of electric shock 18
2.3 Protective provisions and protective measures 19
Chapter 3 Provisions for basic protection 21
3.1 Introduction 21
3.2 Insulation 21
3.3 Barriers or enclosures 22
Chapter 4 Automatic disconnection of supply 25
4.1 The protective provisions 25
4.2 Definitions 25
4.3 Automatic disconnection of supply 26
4.4 TN system, requirements for disconnection 32
4.5 TT system, requirements for disconnection 34
4.6 IT systems 36
4.7 Functional extra-low voltage (FELV) 38
4.8 Reduced low voltage systems 39
4.9 Additional protection by RCDs 41
4.10 Additional protection where automatic disconnection times cannot be achieved 44
4.11 Where automatic disconnection is not required for shock protection 45
4.12 Highway power supplies 45
Chapter 5 Double or reinforced insulation 47
5.1 The protective provisions 47
5.2 Effective supervision of installations and circuits 47
5.3 Circuit protective conductors (cpcs) 47
5.4 Equipment marking 48
5.5 Wiring systems 48
Chapter 6 Electrical separation 49
6.1 The protective provisions 49
6.2 Electrical separation applied to one item of equipment 5 0
6.3 Electrical separation for the supply to more than one item of current-using equipment 50
Chapter 7 Extra-low voltage provided by SELV or PELV 5 3
7.1 The protective provisions 53
7.2 Extra-low voltage (ELV) systems 54
7.3 SELV (separated extra-low voltage) 56
7.4 PELV (protective extra-low voltage) 59
7.5 Calculation of loop impedance in PELV (and FELV) circuits 6 0
7.6 SELV and PELV requirements in Part 7 of BS 7671 61
Chapter 8 Additional protection 63
8.1 The protective provisions 63
8.2 Additional protection by residual current devices (RCDs) 63
8.3 Additional protection by supplementary equipotential bonding 68
8.4 Example calculation 70
Chapter 9 Obstacles and placing out of reach 73
9.1 Scope of application 73
9.2 The protective provisions 74
9.3 Definitions 74
9.4 Obstacles 74
9.5 Placing out of reach 75
Chapter 10 Protective measures for application only where the installation is controlled or under the supervision of skilled or instructed persons 81
10.1 Protective measures and provisions 81
10.2 Non-conducting location 82
10.3 Earth-free local equipotential bonding 84
10.4 Electrical separation for the supply to more than one item of current-using equipment 85
Chapter 11 Earthing 87
11.1 Earthing systems 87
11.2 High voltage (HV) supplies 90
11.3 Earth electrodes 9 0
11.4 Earthing conductor 93
11.5 Main earthing terminal or bar 94
11.6 Functional earthing 95
Chapter 12 Circuit protective conductors (cpcs) 97
12.1 Introduction 97
12.2 Sizing of circuit protective conductors (cpcs) 97
12.3 Provision of circuit protective conductors (cpcs) 100
12.4 High protective conductor currents 101
Chapter 13 Protective equipotential bonding 107
13.1 Introduction 107
13.2 Main protective equipotential bonding 107
13.3 Supplementary equipotential bonding 111
13.4 Example of supplementary bonding 113
13.5 Extraneous-conductive-parts 1 15
Chapter 14 Protective multiple earthing 117
14.1 Introduction 117
14.2 Supply system 118
14.3 Potential difference within buildings 119
14.4 Potential difference outside buildings 119
14.5 Additional earth electrode for PME supplies 119
14.6 Special locations 122
Chapter 15 Special installations or locations 131
15.1 The increased risks 131
15.2 Regulation numbering 133
15.3 Supplementary and modified requirements 133
Chapter 16 Cables installed in walls, floors, ceilings and partitions 145
16.1 A cable installed under a floor or above a ceiling 145
16.2 A cable installed in a wall or partition 145
16.3 A cable installed in a wall or partition with metal parts 146
Appendix A Maximum permissible measured earth fault loop impedance 153
Appendix B Resistance of copper and aluminium conductors 153
Index 155

Tags: guidance note 5 BS 7671, guidance note 5-2022, guidance note 5-18th edition, guidance note 5 A2:2022