There are many books on electrical installation practice where the focus is on calculations and regulations. Electrical Installation Designs has been written from a different viewpoint. Typical projects are examined to produce designs that will fit current standards. Most electrical contractors have an understanding of requirements related to their own regular everyday activities. Work is carried out using rule-ofthumb methods. Repetitive designs are used. Many installers claim that they are not designers and show concern that they are now required to certify the adequacy of an installation design.
In practice problems only arise when an unusual project is undertaken or there is a change in regulations. There is no harm in using a standardized design, rather in the way that an experienced cook uses a published recipe for a cake. Electrical Installation Designs is a book of recipes. The installer may select a design that corresponds as near as possible to the contract in hand and take up such technical and regulatory advice as is required. This will reduce lengthy calculations and detailed study of BS 7671, Requirements for Electrical Installations.
Most basic electrical installations may be completed by a competent person with appropriate guidance to avoid serious problems and hazards. Project chapters illustrate methods that could be used for particular types of installation ranging from a house to an industrial workshop. The ideas are by no means exclusive. Alternative solutions are always possible. In many instances detailed calculations and different circuitry will be more profitable.
By their very nature, simplified examples of fictional projects can only produce generalized results. The book contains special chapters on earthing, isolation and switching and over-current protection which give a down to earth interpretation of the regulations. Electrical installation students and non-electrical associates in the construction industry will appreciate the user-friendly approach. Nevertheless, this is not a do-it-yourself book for the untrained person. Warnings are given where more specialized study is necessary. For example, readers are advised not to embark on flameproof installations without further training. Apart from moral implications and contractual risks, statutory requirements are such that incompetent work may carry criminal penalties.
Although the emphasis is on tried and tested methods, some new techniques are introduced. Most significant is the option for tree circuitry as an alternative to outdated ring mains. This is the first book to give designers the opportunity to compare the advantages of the tree system for both domestic and commercial installations. In recent years consumer requirements have changed. It is essential that the industry keeps an open mind on changes in traditional wiring practice.
The IEE joint wiring regulations committee amended BS 7671:1992 three times, in 1994, 1997 and 1999. In 2001 the standard was renamed BS 7671:2001 with further amendments, and minor amendments were made again in 2002. In addition in 2002, the Electricity Supply Regulations were replaced by the Electricity Supply Quality and Continuity Regulations. The most recent edition of BS 7671 incorporates all alterations and additions to the European HD 384 series of standards. Many of the changes are of a minor nature in order to harmonise with the standards.
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