TENDER DOCUMENT-TENDER NO. KP1-9A.3-OT-36-20-21 (SUPPLY OF 220KV, 132KV, 66KV AND 33KC CIRCUIT BREAKERS AND SURGE ARRESTERS TENDER NO. KP1/9A.3/OT/36/20-21 FOR SUPPLY OF 220KV, 132KV, 66KV AND 33KV CIRCUIT BREAKERS AND SURGE ARRESTERS ADDENDUM 1-PRE-BID AND CLOSING DATE EXTENSION.-CIRCUIT BREAKERS AND SUREGE ARRESTERS