This new edition of EIS: Maintaining Electrotechnical Systems from the highly successful Electrical Installation Series covers all the information required to complete the Maintaining Electrotechnical Systems 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 SummitSkills 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-in studybooks are the ideal course companion for any aspiring electrician.