This book is written principally for the use of the non-academic apprentice electrician. Its practical spproach will supply the reader with the confidence and knowledtge that is necessary to enable him to carry out his everyday work in an efficient manner and will help to prepare him for the City and Guilds certificate in Electrical Installation. The work will also be of interest to those in the industry wishing to brush up on the subject. The book gives practical information on the various types of wiring used in domestic and industrial installations. Starting with Ohm's Law, it uses simple equations throughout for resistance, current, power, heating effect, etc., so that the basic theory is well covered. It goes on to circuits, bells, batteries, motors, certification and lighting. In this third edition great care has been taken to ensure that the units, symbols, circuit diagrams and abbreviations comply with the current I.E.E. regulations and B.S. 3939. Recent City and Guilds examination questions have been added to the text. The craft student will find the volume fully comprehensive, clear and well illustrated.