VII. B: Disconnecting switch:   VII.B.1: 110 kV disconnecting switch with 01 or 02 Earth switches. Standard: IEC 62271 – 102. Technical Parameters: Three phases interlocking isolation switch, central break and outdoor type. Rated voltage: 123 kV Rated frequency: 50Hz         Rated current: 1250A         Short - time withstand current: 25kA/3s         Making current: 63 kA (peak) Material of contact: Cu, Silver plated         For each disconnecting switch an electromagnetic lock is equipped.         In order to ensure safe operation an interlocking scheme must be designed which covers either motor         operation and hand operations. Operating mechanism: -        Main blade is operated by motor/hand, -        Operating Motor Voltage: 220VDC. -        Earthing blade is operated by hand -        Aux. contacts 6NO/6NC for main blade. -        Aux. contacts 6NO/6NC for earthing blades. -        The operating mechanism will have a stainless steel enclosure, IP55 type. -        Number of earthing blade according to the list table of equipment. -        Equipped with electrical and mechanical interlocking devices. Live parts: -        High voltate terminal shall be made of high strength aluminum alloy or copper with silver plated. -        High voltage terminal and rotary head shall be designed to ensured that conductor or tube which connected to DS do not turn around during operation of disconnector. In the local control box, there must be: -        Push buttons: Open, Close and Stop. -        A local/remote switch for selecting control position. Earthing switch: -        For earthing switch, in order to ensure safe operation an electromagnetic lock with interlocking conditions must be equipped for each earthing switch. -        Number of earthing blade according to scope of supply. Accessories: -        Control cubicle. -        Zinc galvanized Supporting structure, bidder shall specify the height of support according to drawing provided. -        Handle to manual operated -        Terminal connectors for conductor and earthing terminals -        Document for installation, operation, maintenance, and test