Now in its eight edition, this volume has been fully updated in line with the 17th Edition IEE Wiring Regulations (BS 7671: 2008) and references the material covered to the Wiring Regulations throughout. The content meets the requirements of the 2330 Level 2 Certificate in Electrotechnical Technology from City & Guilds. Essential calculations that may not necessarily feature as part of the requirements of the syllabus are retained for reference for professional electrical installation engineers based in industry, or for those students wishing to progress to higher levels of study. This book's structure and design makes finding the required calculations easy. Key terms are explained in a glossary section and worked examples and exercises are included throughout the text to maximize accessibility. A complete question and answer section is included at the back of the book, enabling readers to check their understanding of the calculations presented.