This is an extremely detailed account of how to carry out practical testing to BS7671, This book is suitable for students studying C&G 2330, 2381, 2391, 2400, NVQ level II, III and domestic installer level 2 courses. Key topics are; Continuity of circuit protective conductors. Continuity of main and supplementary bonding. Insulation resistance. Earth loop impedance. Prospective short circuit current. Prosective earth fault current. Health and safety when testing. Safe isolation. The book contains very clear concise drawings and wiring diagrammes that detail the practicallities of how to test the fixed wiring within installations.