Guide to the IET Wiring Regulations (eBook)

Electrical Contractors' Association (ECA), ESCA House, London, UK The Electrical Contractors' Association (ECA) is the UK's leading trade association for contractors who design, install, inspect, test and maintain electrical and electronic equipment and services. In its capacity to work with regulatory bodies and government to lead on issues including safety, training, qualification and technological development, ECA is represented on the committees which regularly reviews and updates British Standards on electrical wiring regulations, used in the UK and many commonwealth countries. The ECA has partnered with Wiley on a number of successful books on key topics of interest to its membership.

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 influences 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