transformers(sub-transmission system) and attended 11 main type kV sub-station. 7.9.4 Electrical Safety Rules(see Appendix V) Minimum safety standards are mandatory and are framed in such a manner that the supply authorities can adopt them as working procedures. Supply authorities, in addition, frame their own rules which cover such aspects as requiring that all equipment must be regarded as alive until proved dead, protective clothing to be worn, demarcation of dangerous areas, safe working distances, use of safety equipment and insulated tools, and associated testing requirements. Methods of isolation, earthing, labelling, proving dead, use of tape barriers and the use of an access permit system are given. Special precautions to be observed in the use of equipment, such as tong tester, ammeters and