Designed to provide a step by step guide to successful application of the electrical installation calculations required in day to day electrical engineering practice, the Electrical Installation Calculations series has proved an invaluable reference for over forty years, for both apprentices and professional electrical installation engineers alike. Now in its seventh edition, Volume 1 has been fully updated to meet the requirements of the 2330 Level 2 Certificate in Electrotechnical Technology from City & Guilds, and will also prove a vital purchase for students of the Level 2 NVQ in Installing Electrotechnical Systems (2356). Essential calculations which may not necessarily feature as part of the requirements of these syllabi are retained for reference by professional electrical installation engineers based in industry, or for those students wishing to progress to higher levels of study.