This new edition of EIS: Principles of Design, Installation and Maintenance from the highly successful Electrical Installation series covers all the information required to complete the Principles of Design, Installation and Maintenance unit as part of the Level 3 Diploma for City and Guilds (2357) and EAL equivalent qualifications. The nine studybooks are endorsed by The Electrical Contractors Association (ECA) and cover all core Level 3 S/NVQ Diploma units and are mapped to the National Occupational Standards. The modular, hands-on approach is designed to clearly explain all the key concepts so learners gain all the necessary theoretical and practical skills required for each unit. The expert author team brings a wealth of industry knowledge and experience to each publication all brought to life by full-colour diagrams, images and photographs. Students can use one book per unit as a complete study resource to support learning in the classroom, at work and for personal study at home. These spiral bound, write-it studybooks are the ideal course companion for any aspiring electrician.