GN 4 is of interest to all those who are involved with specifying, designing, installing or verifying electrical installations and it covers this essential aspect BS 7671. The market includes consulting engineers, electricians, electrical installers, inspectors and technicians and can also serve as a guide for surveyors. GN 4 Protection Against Fire is guide and reference manual on this key safety aspect of BS 7671 (The IET Wiring Regulations), the national standard to which all domestic and industrial wiring must conform. The Guide has been revised to align with the 17th Edition Amendment No 1.