- This specification has been prepared by Design Department , Power Wing, WAPDA.
- These specifications was first introduced in August 1968.
- Its revised editions were issued in 1979,1985 & 1987.
- These specifications applies to 11KV A.C three phase metal clad switchgear for indoor application.
- the switchgear covered by this specification comprises of SF6 & Vacuum Type Circuit Breakers.
The switchgear, including the operating devices and the auxiliary equipment which form an integral part of it,shall be designed, manufactured and tested in accordance with the following International Electro-technical Commission (IEC) Publications:
- IEC - 56 HV AC Circuit Breakers
- IEC - 298 AC metal enclosed Switchgear & Control
- IEC - 694 HV Switchgear & Control Gear COmmon Clauses
- IEC - 185 Current Transformer
- IEC - 186 Voltage Transformer
- IEC - 265-1 HV Switches
- IEC - 51-1 Electrical Measuring Instruments & their Accessories
- IEC - 51-2 Same as above
- IEC - 51-3 Same as above
- IEC - 51-5
Same as above
- IEC - 51-8
Same as above
- IEC - 468 Measurement of Resistivity of Metallic materials
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