ET1/PSI/120 (2/91) )ġ.1 This code of practice caters for general arrangements of system and equipment earthing at 220/ 25 kV or 132/25 kV or 110/25 kV or 66/25 kV traction substations, 25 kV switching stations, booster transformer stations and auxiliary transformer stations. (This is a reproduction of RDSO's CODE No. FOR EARTHING OF POWER SUPPLY INSTALLATIONS FOR 25kV, ac, 50Hz, SINGLE PHASE TRACTION SYSTEM
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