Modern wiring practice: design and installation

W E Steward, T A Stubbs0750666625, 9780750666626, 9780080458496

Continuously in print since 1952, the twelfth edition of Modern Wiring Practice has now been fully revised to provide an up-to-date source of reference to electrical design and installation, meeting the requirements of the 2004 version of the IEE Wiring Regulations BS 7671:2001 (incorporating Amendments 1:2002 & 2:2004). This compact and practical guide addresses wiring systems design and electrical installation together in one volume, creating a comprehensive overview of the whole process for contractors and architects, as well as electricians and other installation engineers. Best practice is incorporated throughout, combining theory and practice with clear and accessible explanation, all within the framework of the Wiring Regulations. Modern Wiring Practice is one of the classic handbooks for the trade, designed for a wide range of professionals. Introducing the fundamentals of design and installation with a minimum of mathematics, this book is also an essential purchase for all students of electrical installation courses, such as the 2330 Certificate in Electrotechnical Technology, and NVQs from City & Guilds (including 2356 and 2391, 2381, 2400 awards), as well as trainees in industry undertaking Apprenticeships and Advanced Apprenticeships. * Brought fully in line with the latest IEE Wiring Regulations BS 7671:2001 * Well established and renowned text in the trade – continuously in print since 1952! * Wiring systems design and electrical installation fully explained with a minimum of math’s – ideal text for students and apprentices new to the field, and an essential reference for electrical installation engineers in industry

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Table of contents :
Cover……Page 1
Modern Wiring Practice: Design and Installation……Page 4
Contents……Page 6
Preface……Page 10
Acknowledgements……Page 11
Part 1 DESIGN OF ELECTRICAL INSTALLATION SYSTEMS……Page 12
Planning of installation work……Page 14
The Electricity Safety, Quality and Continuity Regulations 2002……Page 16
IEE Wiring Regulations – BS 7671……Page 17
Part 1 Scope……Page 19
Part 2 Definitions……Page 20
Part 3 Assessment of general characteristics……Page 21
Part 6 Special installations or locations……Page 22
The Electricity at Work Regulations 1989……Page 23
The Low Voltage Electrical Equipment (Safety) Regulations 1989……Page 27
Health and Safety at Work Act 1974 (reprinted 1977)……Page 28
Assessment of general characteristics……Page 29
The maximum current demand……Page 30
Compatibility of the equipment……Page 31
Maintainability……Page 33
Systems of supply……Page 34
Protective multiple earthing (PME)……Page 37
Protection against electric shock……Page 38
Protection against thermal effects……Page 42
Protection against overcurrent……Page 43
Protection against undervoltage……Page 48
Isolation and switching……Page 49
Circuit design……Page 50
Subdivision and number of circuits……Page 51
Multicore cables in parallel……Page 53
4-core cables with reduced neutrals……Page 54
Designed circuit current……Page 55
Size of live conductors……Page 56
Grouped cables not subject to simultaneous overload……Page 64
Voltage drop……Page 67
Short-circuit protection……Page 70
Protection against indirect contact……Page 74
Summary……Page 77
Worked example……Page 80
Design by computer……Page 93
3 Tables from IEE Regulations for Electrical Installations……Page 104
4 Distribution of supplies in buildings……Page 114
Main switchgear……Page 117
Selection of switchgear of suitable capacity……Page 119
Main switchgear for domestic installations……Page 123
Main switchgear for industrial installations……Page 126
Types of distribution boards……Page 134
Positions of distribution boards……Page 136
Supplies exceeding 230 V a.c…….Page 138
Feeding distribution boards……Page 139
Colour identification of cables and conductors……Page 140
Switch wires……Page 141
Distribution circuits……Page 143
Protective multiple earthing (PME)……Page 144
Power factor……Page 145
Wattless current……Page 146
Improving the power factor……Page 147
Regulations governing final circuits……Page 148
Final circuit feeding fixed equipment or 2 A sockets……Page 149
Final circuit feeding 13 A sockets to BS 1363……Page 152
Spurs……Page 155
Flexible cords for fused plugs……Page 157
Final circuit for socket outlets to BS 196……Page 158
Final circuit for socket outlets to BS EN 60309……Page 159
Final circuits feeding fluorescent and other types of discharge lighting……Page 160
Final circuits feeding motors……Page 162
Final circuits feeding cookers……Page 170
Bath and shower rooms……Page 172
Off-peak heating……Page 174
Underfloor and ramp heating……Page 175
Installations in hazardous areas……Page 177
Electrical installations for caravan parks and caravans……Page 178
Caravan installations……Page 179
Installations on construction sites……Page 180
Emergency supplies to premises……Page 182
Emergency lighting systems……Page 184
Standby supplies……Page 185
System of wiring……Page 186
Agricultural and horticultural premises……Page 187
Highway power supplies……Page 188
Part 2 PRACTICAL WORK……Page 190
Principal types of wiring systems……Page 192
Choice of wiring system……Page 193
Foundations of good installation work……Page 195
Methods of installation……Page 206
Band II……Page 208
The screwed steel conduit system……Page 214
Types of screwed steel conduit……Page 215
Choice of the correct size of conduit……Page 216
Installation of screwed conduit……Page 218
The surface system……Page 219
Termination of conduit at switch positions……Page 236
Termination of conduit at other than switch positions……Page 237
Conduit installed in damp conditions……Page 238
Flexible conduit……Page 239
Surface conduits feeding luminaires and clocks……Page 240
Drawing cables into conduits……Page 241
Some practical hints……Page 244
Checking conduit for obstructions……Page 245
Bending conduit……Page 246
Drilling and cutting……Page 247
Running conduit in solid floors……Page 248
The light gauge unscrewed conduit system……Page 253
Insulated conduit system……Page 255
Installation of plastic conduit……Page 257
Metallic trunking……Page 262
Regulations……Page 264
Lighting trunking system……Page 266
Non-metallic trunking……Page 267
Installation of non-metallic trunking……Page 269
Cable ducts……Page 271
Steel floor trunking……Page 272
Plastic underfloor trunking……Page 275
Busbar system……Page 278
Busbar system for rising mains……Page 280
Grid catenary system……Page 281
Armoured, insulated and sheathed cables……Page 284
LSF sheathed cables……Page 285
Cable tray, cable basket and cable ladder……Page 286
Paper-insulated cables……Page 293
12 All-insulated wiring systems……Page 295
Surface wiring……Page 296
Concealed wiring……Page 299
Precautions where cables pass through walls, ceilings, etc…….Page 301
Practical hints……Page 302
Fixing……Page 304
Regulations on sealing……Page 307
Preparation of cable end……Page 308
Some practical hints……Page 315
Inductive loads……Page 316
Ceiling roses……Page 317
Luminaires……Page 318
Flexible cords……Page 319
Lampholders……Page 320
Socket outlets and plugs……Page 321
Switches……Page 323
15 Earthing……Page 327
Inspection……Page 334
Testing……Page 335
Continuity tests……Page 336
Insulation resistance……Page 337
Polarity……Page 339
Earth electrode resistance……Page 340
Earth fault loop impedance……Page 341
Completion Certificates and Inspection Report Forms……Page 342
Notice of re-inspection and testing……Page 343
B……Page 346
C……Page 347
D……Page 349
E……Page 350
F……Page 351
I……Page 352
M……Page 353
P……Page 354
R……Page 355
S……Page 356
U……Page 357
X……Page 358