Guide to the Wiring Regulations: 17th Edition IEE Wiring Regulations (BS 7671:2008)

Guide to the Wiring Regulations......Page 2
Foreword by Giuliano Digilio......Page 14
Preface......Page 16
Acknowledgements......Page 20
	A 1	Introduction to BS 7671: 2008......Page 22
	A 2	Plan and layout of BS 7671: 2008......Page 25
	A 3	Overview of major changes......Page 26
B 1.1	Key UK legislation......Page 32
B 1.2	The Electricity at Work Regulations 1989 (EWR 1989)......Page 33
B 1.3	The Electricity Safety, Quality and Continuity Regulations 2002 (as amended)......Page 34
B 1.5	The Building Act 1984, The Building Regulations and Part P......Page 35
B 1.7	Tort and negligence......Page 37
	B 2	The role of Standards......Page 38
	B 3	Part 3 of BS 7671: 2008 – assessment of general characteristics......Page 40
	C 1	Introduction......Page 42
	C 2	Design procedure overview......Page 43
C 3.1	Principles and definitions......Page 44
C 3.2	Maximum demand assessment......Page 47
C 3.3	Diversity......Page 49
C 4.1	Introduction......Page 51
C 4.3	Overload protection......Page 53
C 4.4	Fault protection......Page 67
C 4.5	Voltage drop......Page 70
C 4.6	Disconnection and electric shock......Page 76
C 5.2	Distribution circuit (submain) selection......Page 85
C 5.3	Armouring as a cpc......Page 86
C 6.1	Principles and system co-ordination......Page 88
C 6.2	Fuse-to-fuse discrimination......Page 90
C 6.3	Circuit breaker to circuit breaker discrimination......Page 91
C 6.4	Circuit breaker to fuse discrimination......Page 92
C 7.1	General and 7671 requirements......Page 93
C 8.1	Requirements......Page 94
C 9.1	Introduction and scope......Page 95
C 9.2	Standard domestic circuits......Page 98
C 9.3	All-purpose standard final circuits......Page 100
C 10.1	Introduction, increased use of RCDs......Page 104
C 10.2	Consumer unit arrangements for RCDs......Page 105
C 11.2	Ring final circuits......Page 108
C 11.3	Radial final circuits......Page 110
	D 1	Introduction and fundamentals......Page 112
	D 2	Compliance with Standards......Page 113
	D 3	Identification of conductors......Page 114
D 3.1	Principle of required identification (514.3.1)......Page 115
D 3.2	Identification by colour......Page 116
D 3.4	Additions and alterations – identification......Page 118
D 3.6	d.c. identification......Page 119
D 4.2	EMC directive and BS 7671......Page 122
D 4.3	EMC cable separation – power, IT, data and control cables......Page 123
D 4.4	Cable management and EMC......Page 126
D 5.1	The choice of wiring systems......Page 127
D 5.2	Circulating currents and eddy currents in single-core installations......Page 131
D 5.3	Electrical connections and joints......Page 133
D 5.4	Wiring systems – minimizing spread of fire......Page 138
D 6.1	General......Page 140
D 6.2	Operation and characteristics......Page 141
D 6.3	Ambient temperature de-rating......Page 145
D 7.1	BS 7671 applications......Page 146
D 7.2	Operation and BS 7671 requirements......Page 148
D 7.3	Unwanted RCD tripping and discrimination......Page 149
D 7.5	TT installations and RCDs......Page 151
D 8.3	Overvoltage, undervoltage and electromagnetic disturbances......Page 153
D 8.4	Surge protective devices......Page 154
D 8.6	Residual current monitors (RCMs)......Page 156
	D 9	Generating sets......Page 158
	D 10	Rotating machines......Page 159
	D 11	Plugs and socket outlets......Page 160
	D 12	Electrode water heaters and electrode boilers......Page 161
	D 14	Lighting and luminaires......Page 162
D 15.2	Classification of break times......Page 165
D 15.3	Safety sources......Page 166
D 16.1	General......Page 167
D 16.2	Equipment applications and examples......Page 170
	E 1	Introduction......Page 172
	E 2	Earthing arrangements......Page 174
	E 3	General requirements of earthing and bonding......Page 180
E 4.2	Physical types of protective conductor......Page 183
E 4.3	Sizing protective conductors......Page 185
E 4.4	Protective conductors up to 16 mm2......Page 186
E 5.1	General......Page 188
E 5.2	ERA report on current sharing between armouring and cpc......Page 189
E 6.1	Purpose of protective equipotential bonding......Page 190
E 6.3	Bonding solutions for the modern installation......Page 191
E 6.4	Sizing protective bonding conductors......Page 198
E 6.6	Supplementary equipotential bonding......Page 199
	E 7	High earth leakage installations......Page 204
F 1.1	Inspection and testing – an integrated procedure......Page 206
	F 2	Visual inspection......Page 207
F 3.2	Required tests......Page 209
F 3.3	Continuity testing......Page 210
F 3.4	Ring continuity......Page 214
F 3.5	Insulation testing......Page 217
F 3.6	Polarity testing......Page 221
F 3.7	Earth fault loop impedance (ELI) testing......Page 222
F 3.8	Prospective fault current testing......Page 226
F 3.9	Testing RCDs and other functional tests......Page 227
F 4.2	Overview of certificates and schedules......Page 229
F 4.3	Completing the paperwork......Page 230
G 1.1	Introduction......Page 240
G 1.2	Purpose and principles......Page 241
G 2.1	Introduction and risks......Page 242
G 2.2	Zone concept......Page 243
G 2.3	Electric shock requirements......Page 247
G 2.4	Equipment selection and erection......Page 248
G 3.1	Introduction and risks......Page 249
G 3.2	Zone concept......Page 250
G 3.3	Requirements and guidance......Page 253
	G 4	Agricultural and horticultural premises (705)......Page 255
G 4.2	Requirements and guidance......Page 256
G 5.1	Introduction, purpose and principles......Page 260
G 5.2	Requirements and guidance......Page 261
	G 6	Exhibitions, shows and stands (711)......Page 264
G 6.2	Requirements and guidance......Page 265
G 7.1	Introduction, principles and terminology......Page 267
G 7.3	Notes and guidance......Page 270
G 8.1	Scope and application......Page 274
G 8.3	Notes and guidance......Page 275
G 9.2	Requirements......Page 277
G 9.3	Notes and guidance......Page 278
Appendices......Page 282
Appendix 1 – Standards and bibliography......Page 283
Appendix 2 – Popular cables: current rating tables from BS 7671: 2008 Appendix 4......Page 288
Appendix 3 – Limiting earth fault loop impedance tables from BS 7671: 2008......Page 291
Appendix 4 – Cable data-resistance, impedance and ‘R1 + R2’ values......Page 293
Appendix 5 – Fuse I2t characteristics......Page 297
Index......Page 298