17th Edition IEE Wiring Regulations: Inspection, Testing and Certification, Sixth Edition (IEE Wiring Regulations, 17th edition)

137 Pages·2008·1.99 MB·English

by  Brian Scaddan IEng

17th Edition
IEE Wiring Regulations:
Design and Verification of Electrical
Installations
By the same author
17th Edition IEE Wiring Regulations: Inspection, Testing and Certification,
ISBN 978-0-7506-8719-5
17th Edition IEE Wiring Regulations: Explained and Illustrated, ISBN
978-0-7506-8720-1
Electric Wiring: Domestic, ISBN 978-0-7506-8735-5
PAT: Portable Appliance Testing, ISBN 978-0-7506-8736-2
Wiring Systems and Fault Finding, ISBN 978-0-7506-8734-8
Electrical Installation Work, ISBN 978-0-7506-8733-1
17th Edition
IEE Wiring Regulations:
Design and Verification of Electrical
Installations
Sixth edition
Brian Scaddan , IEng, MIET
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British Library Cataloguing in Publication Data
Scaddan, Brian
17th edition IEE wiring regulations : design and verification of electrical
installations. – 6th ed. 1. Electric wiring, Interior – safety regulations – Great Britain
2. Electric wiring, Interior – Handbooks, manuals, etc. I. Title II. Scaddan, Brian.
16th edition IEE wiring regulations III. Institution of Electrical Engineers
IV. Seventeenth edition IEE wiring regulations
621.3’1924’0941
Library of Congress Control Number: 2008926538
ISBN: 978-0-7506-8721-8
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In memory of
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A friend and colleague
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17th Edition IEE Wiring Regulations vii
Contents
PREFACE .............................................................................................ix
CHAPTER 1 Design ............................................................................1
Assessment of General Characteristics ..................................................1
Protection for Safety ..............................................................................6
Protection Against Electric Shock ...........................................................7
Protection Against Thermal Effects (IEE Regulations Chapter 42) .........15
Protection Against Overcurrent ............................................................16
Protection Against Overload .................................................................18
Protection Against Fault Current ..........................................................19
Protection Against Undervoltage (IEE Regulations Section 445) ...........23
Protection Against Overvoltage
(IEE Regulations Sections 442 and 443) ...............................................23
Isolation and Switching ........................................................................23
Design Calculations .............................................................................25
CHAPTER 2 Inspection and Testing..................................................53
Initial Verification .................................................................................53
Inspection ...........................................................................................54
Testing ................................................................................................54
Approved Test Lamps and Indicators ...................................................55
Calibration, Zeroing/Nulling and Care of Instruments ...........................57
The Tests ............................................................................................58
Continuity of Protective Conductors .....................................................59
Continuity of Ring Final Circuit Conductors ..........................................61
Insulation Resistance ..........................................................................70
Polarity ...............................................................................................72
Ring Final Circuits ...............................................................................72
Radial Circuits .....................................................................................73
Earth Electrode Resistance ..................................................................73
External Loop Impedance Z ................................................................77
e
Earth Fault Loop Impedance Z ...........................................................78
s
Additional Protection ...........................................................................78
vii
viii Contents
CHAPTER 3 Special LocationsIEE Regulations Part 7 .......................85
Introduction ........................................................................................85
BS 7671 Section 701: Bathrooms, etc. . ...............................................86
BS 7671 Section 702: Swimming Pools ...............................................89
BS 7671 Section 703: Hot Air Saunas .................................................92
BS 7671 Section 704: Construction Sites.............................................93
BS 7671 Section 705: Agricultural and Horticultural Locations.............95
BS 7671 Section 706: Restrictive Conductive Locations .......................97
BS 7671 Section 708: Caravan and Camping Parks .............................97
BS 7671 Section 709: Marinas ............................................................99
BS 7671 Section 711: Exhibitions, Shows and Stands........................100
BS 7671 Section 712: Solar Photovoltaic (PV) Supply Systems ..........101
BS 7671 Section 717: Mobile or Transportable Units .........................102
BS 7671 Section 721: Caravans and Motor Caravans ........................102
BS 7671 Section 740: Amusement Devices, Fairgrounds,
Circuses, etc. ....................................................................................104
BS 7671 Section 753: Floor and Ceiling Heating Systems ..................104
APPENDIX 1 BS 7671 Appendices ................................................107
APPENDIX 2 Sample Questions .....................................................109
APPENDIX 3 Suggested Solutions to Sample Questions ..................115
INDEX...............................................................................................123
Preface
There are many electrical operatives who, quite innocently I am
sure, select wiring systems based on the old adage of ‘that’s the
way it’s always been done ’ or ‘we always use that size of cable for
that circuit’ etc. Unfortunately this approach, except for a few
standard circuits, is quite wrong. Each wiring system should be
designed to be fit for purpose and involves more than arbitrary
choices.
The intention of this book is to illustrate the correct procedure for
basic design of installations from initial assessment to final com-
missioning. It will also be of use to candidates studying for a C& G
2391-20 Design qualification.
This edition has been revised to serve as an accompaniment to the
new City & Guilds scheme and has been brought fully up-to-date
with the 17th Edition IEE Wiring Regulations.
Brian Scaddan, April 2008
Acknowledgements
I would like to thank Paul Clifford for his thorough technical proof
reading.
ix