Wednesday, May 9, 2018

A PRACTICAL GUIDE TO THE WIRING REGULATIONS Fourth Edition By Geoffrey Stokes and John Bradley

A PRACTICAL GUIDE TO THE WIRING REGULATIONS Fourth Edition By Geoffrey Stokes and John Bradley
1 Plan and terminology of BS 7671:2008 and supporting publications
2 Electricity, the law, standards and codes of practice
3 Scope, object and fundamental principles
4 Assessment of general characteristics
5 Protection against electric shock
6 Protection against thermal effects
7 Protection against overcurrent, undervoltage and overvoltage
8 Isolation and switching
9 Equipment selection: common rules
10 Wiring systems
11 Switchgear, protective devices and other equipment
12 Protective conductors, earthing and equipotential bonding
13 Specialized installations
14 Safety services
15 The smaller installation
16 Special installations and locations
17 Inspection, testing, certification and reporting
This fourth edition of A Practical Guide to the Wiring Regulations takes account of the requirements of BS 7671:2008 Requirements for Electrical Installations (IEE Wiring Regulations Seventeenth Edition). BS 7671:2008 was issued on 1 January 2008 and came into effect on 1 July 2008. It replaces BS 7671:2001 (IEE Wiring Regulations Sixteenth Edition) as the national standard for electrical installation work, and its requirements are to be complied within all electrical installation work designed after 30 June 2008. The content of BS 7671:2008 has undergone extensive changes and additions compared with that of BS 7671:2001. The numbering of the regulations has also been revised to follow the pattern and corresponding references of International Electrotechnical Com mission (IEC) Standard 60364. Account has been taken in BS 7671:2008 of the technical intent of a significant number of revised and new CENELEC harmonization documents (HDs). Indeed, of the 28 HDs listed in the preface of BS 7671:2008, 17 are revised com pared with the versions used in BS 7671:2001, as finally amended, and seven are newl introduced to BS 7671. The revised HDs have led to changes in, amongst other things, the various protective measures specified in Part 4 of BS 7671 and the requirements for special installations or locations. Not the least of the changes are those affecting the general requirements for protection against electric shock, which have been restructured and are subject to new terminology. Another notable change is that it is now permitted to install general-purpose socket-outlets in locations containing a bath or shower, provided these outlets are at least 3 m horizontally outside the boundary of zone 1 and the circuit supplying them is provided with additional protection by an RCD having specified characteristics (as must be all the circuits of the special location). The newly introduced HDs have led to the addition of new sections in BS 7671 relating to: marinas and similar locations; exhibitions, shows and stands; solar photovoltaic power supply systems; mobile or transportable units; caravans and motor caravans (previously covered in Section 608 of BS 7671:2001); temporary installations for structures, amusement devices and booths at fairgrounds, amusement parks and circuses; and floor and ceiling heating systems.

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