17th edition iet wiring regulations explained and illustrated tenth edition pdf
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
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..
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
Part 2 is devoted to the definitions of the terms used throughout the
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,