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Guide to the IET Wiring Regulations IET Wiring Regulations (BS 7671:2008 incorporating Amendment No 1:2011)



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This is the 17th edition with a publication date of 9/30/2013.

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Major new revisions on the best-selling book, including extensive updates to all existing chapters and new coverage on surge protective devices, electromagnetic compatibility, medical locations and new special locations, bringing it in line with the regulation Amendment No.1 published in July 2011 This is a significant revision to the existing, best-selling book and is necessary to bring it in line with the revisions to the standard BS7671: 2008 Amendment No.1, published in July 2011. The revision includes new chapters and content on: surge protective devices and their applications; electromagnetic compatibility; medical locations; and new special locations. It will also include a fairly extensive modification to existing chapters. Timely publication, covering all the essential new technical requirements of the amended standard with new and revised material Includes new coverage on 'hot' topics such as EMC, Harmonics, surge protective devices and medical locations Endorsed by the ECA and SELECT Previous edition is well-established within the electrical industry Author is on the panel of the BS 7671 committee amending the standards Fully-integrated colour including 60 brand new colour illustrations, 20 tables and new high-quality photographs Retains its handy size and binding, ideal for practicing electricians to carry with them for quick reference

Table of Contents

Foreword by Giuliano Digilio xi

Preface xiii

Acknowledgements xv

Chapter A – BS 7671:2008 Amd No. 1:2011 Requirements for Electrical Installations – Introduction and Overview 1

A 1 Introduction to BS 7671:2008 1

A 2 Plan and layout of BS 7671:2008 2

A 3 Overview of major changes 5

A 4 Amendment No. 1:2011 9

Chapter B – Legal Relationship and General Requirements of BS 7671:2008 Amd No. 1:2011 11

B 1 Legal requirements and relationship 11

B 2 The role of Standards 17

B 3 Part 3 of BS 7671:2008 – assessment of general characteristics 18

Chapter C – Circuitry and Related Parts of BS 7671:2008 Amd No. 1:2011 21

C 1 Introduction 21

C 2 Design procedure overview 21

C 3 Load assessment 23

C 4 Circuitry design 26

C 5 Sub-mains 56

C 6 Discrimination co-ordination 58

C 7 Parallel cables 62

C 8 Harmonics 63

C 9 Standard final circuit designs 64

C 10 RCDs and circuitry 73

C 11 Ring and radial final circuits 75

Chapter D – Selection and Erection – Equipment 79

D 1 Introduction and fundamentals 79

D 2 Compliance with Standards 80

D 3 Identification of conductors – introduction 81

D 4 Protection against voltage and electromagnetic disturbance 86

D 5 Wiring systems 95

D 6 Circuit breakers 106

D 7 Residual current devices 111

D 8 Other equipment 116

D 9 Generating sets 121

D 10 Rotating machines 121

D 11 Plugs and socket-outlets 122

D 12 Electrode water heaters and electrode boilers 123

D 13 Heating conductors 124

D 14 Lighting and luminaires 124

D 15 Safety services 127

D 16 Ingress protection (IP), external infl uences 129

Chapter E – Earthing and Bonding 133

E 1 Introduction 133

E 2 Earthing arrangements 133

E 3 General requirements of earthing and bonding 138

E 4 Protective conductors 139

E 5 Armoured cables as protective conductors 147

E 6 Protective bonding 149

E 7 High earth leakage installations 158

Chapter F – Inspection Testing and Certification (Part 6) 161

F 1 Introduction 161

F 2 Visual inspection 162

F 3 Testing 164

F 4 Certification paperwork 183

Chapter G – Special Locations 201

G 1 Introduction purpose and principles 201

G 2 Locations containing a bath or shower (701) 203

G 3 Swimming pools and other basins (702) 208

G 4 Agricultural and horticultural premises (705) 214

G 5 Caravan parks and camping parks (708) 218

G 6 Medical locations (710) 222

G 7 Exhibitions, shows and stands (711) 227

G 8 Solar photovoltaic (PV) power supply systems (712) 229

G 9 Mobile or transportable units (717) 235

G 10 Floor and ceiling heating systems (753) 237

References 240

Appendices 243

Appendix 1 – Standards and bibliography 244

Appendix 2 – Popular cables: current rating tables from BS 7671:2008 Appendix 4 249

Appendix 3 – Limiting earth fault loop impedance tables from BS 7671:2008 252

Appendix 4 – Cable data resistance, impedance and ‘R1 + R2’ values 254

Appendix 5 – Fuse I2t characteristics 258

Index 259

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