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A Practical Guide to The Wiring Regulations: 17th Edition IEE Wiring Regulations (BS 7671:2008), 4th Edition

ISBN: 978-1-4051-7701-6
626 pages
June 2009, Wiley-Blackwell
A Practical Guide to The Wiring Regulations: 17th Edition IEE Wiring Regulations (BS 7671:2008), 4th Edition (1405177012) cover image


This best-selling text has been revised to reflect the requirements of the 17th Edition of the IEEWiring Regulations (BS 7671: 2008).

It includes essential information on the new rules applied to special installations or locations, such as bathrooms, swimming pool locations, camping/caravan sites, marinas, exhibition and show locations, solar photovoltaic power supply systems, and floor and ceiling heating systems, amongst others. It presents clear explanations on inspection, testing, certification and reporting, test instruments and test methods, as well as covering:

  • electricity, the law, standards and codes of practice;
  • assessment of general characteristics;
  • protection against electric shock, thermal effects, overcurrent, undervoltage and overvoltage;
  • isolation and switching;
  • the common rules of equipment selection;
  • switchgear, protective devices and other equipment;
  • wiring systems (including the external influences on them and cable installation methods);
  • protective conductors, earthing and protective bonding;
  • supplies for safety services;
  • the smaller installation, and;
  • specialised installations, such as outdoor lighting, installations in churches, multi-occupancy blocks of flats.

These topics are addressed with pertinent regulation numbers, and a useful appendix lists the relevant Standards. Background guidance and worked examples are provided where appropriate.

Like the earlier editions of this text, this new edition will be a useful aid for designers, installers and verifiers of electrical installations, students of the industry wishing to gain better understanding of the many facets of electrical safety, and ‘duty holders’ as defined by the Electricity at Work Regulations 1989.

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Table of Contents


Preface to the Fourth Edition




1 Plan and terminology of BS 7671:2008 and supporting publications

1.1 Plan of BS 7671:2008

1.2 Terminology of BS 7671:2001

1.3 Supporting publications

2 Electricity, the law, standards and codes of practice

2.1 General

2.2 Electricity: the hazards

2.3 The law

2.4 Standards and codes of practice

3 Scope, object and fundamental principles

3.1 General

3.2 Scope

3.3 Object and effects

3.4 Fundamental principles

4 Assessment of general characteristics

4.1 General

4.2 Loading, maximum demand and diversity

4.3 Arrangement of live conductors and type of earthing

4.4 Nature of supply

4.5 Supplies for safety services and standby purposes

4.6 Installation circuit arrangements

4.7 External influences

4.8 Compatibility

4.9 Maintainability

5 Protection against electric shock

5.1 General

5.2 Provisions for basic protection

5.3 Protective measure: automatic disconnection of supply

5.4 Protective measure: double or reinforced insulation

5.5 Protective measure: electrical separation

5.6 Protective measure: extra-low voltage provided by separated extra-low voltage or protective extra-low voltage

5.7 Additional protection

5.8 Obstacles and placing out of reach

5.9 Protective measures for application only where the installation is controlled or under the supervision of skilled or instructed persons

6 Protection against thermal effects

6.1 General

6.2 Fire caused by electrical equipment

6.3 Precautions where particular risks of danger of fire exist

6.4 Burns

7 Protection against overcurrent, undervoltage and overvoltage

7.1 General

7.2 Nature of protective devices

7.3 Protection against overload

7.4 Protection against fault current

7.5 Determination of prospective fault current

7.6 Characteristics of protective devices

7.7 Overcurrent protection of conductors in parallel

7.8 Coordination of overload and fault current protection

7.9 Protection according to the nature of circuits and distribution systems

7.10 Protection against undervoltage

7.11 Protection against overvoltage

8 Isolation and switching

8.1 General

8.2 Main switch

8.3 Isolation

8.4 Switching off for mechanical maintenance

8.5 Emergency switching and other forms of switching for safety

8.6 Emergency stopping

8.7 Functional switching

8.8 Identification and notices

9 Equipment selection: common rules

9.1 General

9.2 Compliance with standards

9.3 Operational conditions, external influences and accessibility

9.4 Identification and notices

9.5 Mutual detrimental influences

9.6 Compatibility

9.7 Operation and maintenance manual

10 Wiring systems

10.1 Wiring systems

10.2 External influences

10.3 Proximity to other services: general

10.4 Methods of installation of cables

10.5 Resistances of copper conductors

10.6 Electrical connections

10.7 Cable supports and cable management systems

10.8 Minimizing the risk of fire

10.9 Electromagnetic and electromechanical effects

10.10 Conduit and trunking cable capacities

10.11 Maintainability

11 Switchgear, protective devices and other equipment

11.1 Switchgear and protective devices: general

11.2 Switchgear and controlgear

11.3 Selection of devices for overload and fault current protection: general

11.4 Overcurrent protective devices

11.5 Residual current devices

11.6 Identification of overcurrent protective devices

11.7 Discrimination

11.8 Other equipment

12 Protective conductors, earthing and equipotential bonding

12.1 Protective conductors

12.2 Earthing

12.3 Earthing requirements for the installation of equipment having high protective conductor currents

12.4 Protective bonding

13 Specialized installations

13.1 General

13.2 Emergency lighting

13.3 Fire detection and alarm systems

13.4 Petrol filling stations and liquid petroleum gas stations

13.5 Installations in dusty environments

13.6 Installations in underground and multistorey car parks, etc.

13.7 Installations in multi-occupancy blocks of flats

13.8 Installations in ‘Section 20 buildings’

13.9 Installations in churches

13.10 Installations in thatched properties

13.11 Extra-low voltage lighting

13.12 Outdoor lighting installations, highway power supplies and street furniture

13.13 Security lighting

13.14 Welding equipment

13 15 Entertainers’ equipment

13.16 Generator sets

14 Safety services

14.1 Safety services: general

14.2 Common sources

14.3 Parallel and nonparallel sources

14.4 Circuit and equipment requirements

14.5 Protection against overcurrent and electric shock under fault conditions

15 The smaller installation

15.1 Scope

15.2 The IEE On-Site Guide and the NICEIC Domestic Electrical Installation Guide

15.3 User’s requirements

15.4 Wiring systems

15.5 Electricity distributor’s requirements

15.6 Assessment of supply characteristics

15.7 ‘Meter tails’

15.8 System earthing arrangements

15.9 Main protective bonding

15.10 Minimum cross-sectional area of earthing and main protective bonding conductors

15.11 Supplementary bonding

15.12 Devices for protection against overcurrent and for fault protection

15.13 Devices for isolation and switching

15.14 Final circuit design

15.15 Remote buildings

15.16 Minimum number of socket-outlets in domestic premises

15.17 Modifications to existing installations

15.18 Inspection, testing, verification and certification of the smaller installation

16 Special installations and locations

16.1 General

16.2 Locations containing a bath or shower

16.3 Swimming pools and other basins

16.4 Rooms and cabins containing sauna heaters

16.5 Construction-site installations

16.6 Agricultural and horticultural premises

16.7 Conducting locations with restricted movement

16.8 Electrical installations in caravan/camping parks and similar locations

16.9 Marinas and similar locations

16.10 Exhibition shows and stands

16.11 Solar photovoltaic power supply systems

16.12 Mobile or transportable units

16.13 Electrical installations in caravans and motor caravans

16.14 Temporary electrical installations for structures, amusement devices and booths at fairgrounds, amusement parks and circuses

16.15 Floor and ceiling heating systems

17 Inspection, testing, certification and reporting

17.1 Inspection, testing, certification and reporting: general

17.2 Test instruments

17.3 Safety in electrical testing

17.4 Test methods

17.5 Initial verification

17.6 Periodic inspection and testing

17.7 Alterations and additions

17.8 Inspection, testing and certification of specialized installations

Appendix Standards to which reference has been made


Index of figures

Index of tables

Index of regulation numbers

Subject index

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Author Information

EurIng Geoffrey Stokes CEng FIEE FCIBSE was Principal Engineer at the National Inspection Council for Electrical Installation Contracting, and is now a consultant.

EurIng John T Bradley BSc CEng MIET FCIBSE is Principal Engineer at the Electrical Safety Council.

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The Wiley Advantage

  • Revised to take account of 2008 Wiring Regulations revisions

  • Features extensive tabular material, checklists and worked design examples

  • Highly illustrated

  • Includes specimen certificates and standard forms
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