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Summary
Summary
This book deals with an area of practice that many students and non-electricians find particularly challenging. It explains how to interpret circuit diagrams, wiring systems, and outlines the principles of testing before explaining how to apply this knowledge to fault finding in electrical circuits.
A handy pocket guide for anybody that needs to be able to trace faults in circuits, whether in domestic, commercial or industrial settings, this book will be extremely useful to electricians, plumbers, heating engineers and intruder alarm installers.
Author Notes
Brian Scaddan, IEng, MIET, is a consultant for and an Honorary Member of City Guilds. He has over 35 years' experience in Further Education and training. He is Director of Brian Scaddan Associates Ltd, an approved City Guilds and NICEIC training centre offering courses on all aspects of Electrical Installation Contracting including NICEIC DISQ courses. He is also a leading author of books on electrical installation.
Table of Contents
| Preface | p. vii |
| Chapter 1 Diagrams | p. 1 |
| BS EN 60617 Symbols | p. 1 |
| Diagrams | p. 5 |
| Circuit Convention | p. 9 |
| Constructing and Interpreting Circuit Diagrams | p. 9 |
| Heating and Ventilation System | p. 12 |
| Relay Logic | p. 14 |
| Programmable Logic Controllers | p. 16 |
| Drawing Exercises | p. 21 |
| Chapter 2 Wiring Systems | p. 23 |
| Radial Systems | p. 24 |
| Ring Circuits | p. 24 |
| Distribution Systems | p. 25 |
| Emergency Lighting Systems | p. 32 |
| Security and Fire Alarm Systems | p. 36 |
| Call Systems | p. 40 |
| Motor Starter Circuits | p. 40 |
| Central Heating Systems | p. 43 |
| Extra Low-Voltage Lighting | p. 48 |
| Domestic Telephone Systems | p. 49 |
| Chapter 3 Testing and Test Instruments | p. 53 |
| Measurement of Electrical Quantities | p. 53 |
| Selection of Test Instruments | p. 54 |
| Approved Test Lamps and Voltage Indicators | p. 55 |
| Accidental RCD Operation | p. 56 |
| Calibration, Zeroing and Care of Instruments | p. 56 |
| Continuity of Protective Conductors | p. 57 |
| Continuity of Ring Final Circuit Conductors | p. 60 |
| Insulation Resistance | p. 65 |
| Polarity | p. 67 |
| Earth Fault Loop Impedance | p. 69 |
| Earth Electrode Resistance | p. 74 |
| Functional Testing | p. 79 |
| Prospective Fault Current | p. 80 |
| Chapter 4 Fault Finding | p. 83 |
| Signs and Symptoms | p. 83 |
| Ring and Radial Socket Outlet Circuits | p. 85 |
| Radial Circuits Feeding Fixed Equipment | p. 86 |
| Cable Fault Location | p. 87 |
| Emergency Lighting | p. 89 |
| Security and Fire Alarm Systems | p. 89 |
| Call Systems | p. 90 |
| Central Heating Systems | p. 91 |
| Motor Starter Circuits | p. 91 |
| Conclusion and a Cautionary Tale | p. 95 |
| Appendix 1 Shock Risk and Safe Isolation | p. 97 |
| Electric Shock | p. 97 |
| Safe Isolation of Supplies | p. 102 |
| Appendix 2 Basic Electrical Theory | p. 103 |
| Electrical Quantities and Units | p. 103 |
| Power, Current and Voltage | p. 106 |
| Appendix 3 Solutions | p. 109 |
| Quiz Controller (Chapter 1) | p. 109 |
| Index | p. 111 |
