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 "knowledge" 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. With associated online animations and instructional videos to further support your learning, this is the text that no electrical installations student should be without. It includes a multitude of full colour pictures and diagrams to explain difficult concepts. It offers highlighted definitions of technical terms throughout for quick and easy reference. It includes links within the text to online support material.