After many years of developing and teaching courses to comply with the IET Wiring Regulations, it has become apparent that many workers and personnel in the electrical construction industry have forgotten the basic principles and concepts underlying the power supply and its use. This has resulted in misconceptions and much confusion over the interpretation of the regulations.
This publication is intended to clear up these misconceptions, educate the reader, and, if necessary, refresh the reader’s memory. In this regard, emphasis is placed on the areas where the most confusion occurs: grounding and bonding, protection, and circuit design.
About the Book
The current 17th edition of the IET Wiring Regulations (also known as BS 7671), to which this publication conforms, was published in January 2008 and now incorporates Amendment 3.
This book is not a guide to the rules, nor does it replace them, nor does it attempt to inter prêt the rules on a rule-by-rule basis. To assist the reader, each chapter cites the relevant rule number for cross-reference.
It is hoped that this book will be especially useful to college students, electrical engineers, technicians, and managers of small electrical contracting firms that do not normally employ engineers or designers. It should also be useful in the library of those studying for the C&G 2382 series of certifications.
I don’t know who once said, “Rules and regulations are the guidance of the wise and the blind obedience of fools, “and this is certainly the case with the IET Wiring (BS 7671) Regulations. These are not legal regulations, but recommendations for the safe selection and installation of wiring equipment. Earlier editions were treated as the “Electrician’s Bible”.
In using the rules, I have found the index to be a valuable starting point in locating information. However, one may have to try various combinations of wording in order to find a particular item. For example, determining the frequency of testing with the test button for RCD scan prove difficult because there is no mention of it under “residual current devices” or “testing”. In the index, this rule is listed under “Notices”.