A great reference for the new diploma for electrical installations. Well set out with key facts, definitions and safety first sign posts. Well written questions with some answers given accurately at the rear of book. Some other answers can be found in the text. Need occasionally to cross reference to BS7671:2008 but most regulations are mentioned within this books text. Good clear illustration in colour. Some information repeats i.e. safe isolation. Maybe to highlight this concept. Multi choice & short written questions plus diagrams asked for by students to complete. Overall, a well researched product. Not a complete item but a very good course companion. Highly recommended.