This textbook covers all the material you need to pass the first part of the new City & Guilds 2357 Diploma in Electrotechnical Technology.Aligned with the 17th edition IEE Wiring Regulations, this new edition has been thoroughly updated to cover the 'performance' section of the latest 2357 course. Written in an accessible style and with a separate chapter for each unit, this book helps you to master each topic before moving on to the next. End of chapter revision questions help you to check your understanding and consolidate the key concepts learned in each chapter