Contents
PREFACE ………………………………………………………………………………………… vii
CHAPTER 1 The UK Generation, Transmission and Distribution System ……… 1
Voltage Bands …………………………………………………………………………………… 2
The Electricity Safety, Quality and Continuity Regulations 2002 (ESQCR) ……… 5
The Electricity at Work Regulations 1989 ……………………………………………….. 5
The IET Wiring Regulations (BS 7671) …………………………………………………… 6
The Building Regulations 2000 Part āPā …………………………………………………. 6
Earthing Systems …………………………………………………………………………….. 12
CHAPTER 2 Domestic Electrical Installations……………………………………….. 17
The Main Intake Position …………………………………………………………………… 17
Circuits ………………………………………………………………………………………….. 23
Cables …………………………………………………………………………………………… 36
Wiring Systems and Installation Methods ……………………………………………… 40
CHAPTER 3 The Importance of Earthing and Bonding …………………………… 55
Electric Shock …………………………………………………………………………………. 55
Basic Protection ………………………………………………………………………………. 57
Fault Protection ……………………………………………………………………………….. 57
What is Earth and Why and How Do We Connect to it? ……………………………. 58
Residual Current Devices ………………………………………………………………….. 65
Bonding: Questions and Answers ……………………………………………………….. 66
The Faraday Cage ……………………………………………………………………………. 68
CHAPTER 4 Bathrooms ……………………………………………………………………. 69
Zone 0 …………………………………………………………………………………………… 69
Zone 1 …………………………………………………………………………………………… 70
Zone 2 …………………………………………………………………………………………… 71
Supplementary Equipotential Bonding …………………………………………………. 72
CHAPTER 5 Protection …………………………………………………………………….. 73
Protection Against Mechanical Damage ……………………………………………….. 74
Protection of Persons/Livestock Against Dangers …………………………………… 76
CHAPTER 6 Circuit Design ……………………………………………………………….. 85
Diversity …………………………………………………………………………………………. 86
Basic Circuit Design …………………………………………………………………………. 88
Summary ……………………………………………………………………………………….. 99
CHAPTER 7 Inspection and Testing ………………………………………………….. 101
Instruments ………………………………………………………………………………….. 101
Testing …………………………………………………………………………………………. 107
CHAPTER 8 Security Alarm and Telephone Systems ……………………………. 127
Security Alarms ……………………………………………………………………………… 127
Telephone Systems ………………………………………………………………………… 129
APPENDIX 1 Basic Electrical Theory Revision …………………………………….. 133
Electrical Quantities and Units ………………………………………………………….. 133
Power, Current and Voltage ……………………………………………………………… 137
APPENDIX 2 Conductor Identifi cation, Notices and Warning Labels……….. 139
Conductor Identification………………………………………………………………….. 139
Notices and Warning Labels…………………………………………………………….. 140
INDEX …………………………………………………………………………………………. 141