|Book Details :|
Brain Scaddan is the editor of IET Wiring Regulations Explained and Illustrated Tenth Edition eBook.
- CHAPTER 1. Fundamental Requirements for Safety.
- CHAPTER 2. Earthing.
- CHAPTER 3. Protection.
- CHAPTER 4. Isolation Switching and Control.
- CHAPTER 5. Circuit Design.
- CHAPTER 6. Inspection and Testing.
- CHAPTER 7. Special Locations IET Regulations.
As a result of many years developing and teaching courses devoted to compliance with the IET Wiring Regulations, it has become apparent to me that many operatives and personnel in the electrical contracting industry have forgotten the basic principles and concepts upon which electric power supply and its use are based.
As a result of this, misconceived ideas and much confusion have arisen over the interpretation of the Regulations. It is the intention of this book to dispel such misconceptions and to educate and where necessary refresh the memory of the reader.
In this respect, emphasis has been placed on those areas where most confusion arises, namely earthing and bonding, protection, and circuit design.
The current seventeenth edition of the IET Wiring Regulations, also known as BS 7671, to which this book conforms, was published in January 2008 and now incorporates Amendment 3.
This book is not a guide to the Regulations or a replacement for them; nor does it seek to interpret them Regulation by Regulation.
It should, in fact, be read in conjunction with them; to help the reader, each chapter cites the relevant Regulation numbers for cross-reference.
It is hoped that the book will be found particularly useful by college students, electricians and technicians, and also by managers of smaller electrical contracting firms that do not normally employ engineers or designers. It should also be a useful addition to the library of those studying for the C&G 2382 series qualifications.
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It was once said, by whom I have no idea, that ‘rules and regulations are for the guidance of wise men and the blind obedience of fools’. This is certainly true in the case of the IET Wiring (BS 7671) Regulations.
They are not statutory rules, but recommendations for the safe selection and erection of wiring installations. Earlier editions were treated as an ‘electrician’s Bible’: the Regulations now take the form primarily of a design document.
The IET Wiring Regulations are divided into seven parts. These follow a logical pattern from the basic requirements to inspection and testing of an installation and finally to the requirements for special locations:
Part 1 indicates the range and type of installations covered by the Regulations, what they are intended for, and the basic requirements for safety.
Part 2 is devoted to the definitions of the terms used throughout the Regulations.
Part 3 details the general information needed and the fundamental principles to be adopted before any design work can usefully proceed.
Part 4 informs the designer of the different methods available for protection against electric shock, overcurrent, etc., and how to apply those methods.
Part 5 enables the correct type of equipment, cable, accessory, etc. to be selected and erected in accordance with the requirements of Parts 1–4.
Part 6 provides details of the relevant tests to be performed on a completed installation before it is energized.
Part 7 deals with particular requirements for special installations and locations such as bathrooms, swimming pools, construction sites, etc.
Appendices. These provide tabulated and other background information required by the designer/installer/tester.
It must be remembered that the Regulations are not a collection of unrelated statements each to be interpreted in isolation; there are many cross-references throughout which may render such an interpretation valueless.
In using the Regulations I have found the index an invaluable starting place when seeking information. However, one may have to try different combinations of wording in order to locate a particular item.
For example, determining how often an RCD should be tested via its test button could prove difficult since no reference is made under ‘Residual current devices’ or ‘Testing’; however, ‘Periodic testing’ leads to Regulation 514.12, and the information in question is found in 514.12.2. In the index, this Regulation is referred under ‘Notices’.