tender for retrofitting of 220 kv isolators under em ( oph ) dept., santaldih t.p.s., the wbpdcl---1 isolator, hcb, 245kv, 2000a 40ka short time rating, mechanically ganged, parallel operated, with support insulator, without earth switch additional data: insulator cantilever strength: 6kn, minimum creepage: 31mm/kv. 2 isolator, 220kv, 2000a, complete set #part list: a) isolator mom box: 1 no, b) e/s mom box: 1 no,c) post insulator (6 no. top + 6 no. bottom): 12 no,d) operating rod: 1 no, e) male female arm (3# for 220kv hcb isolator, motor operated additional data: with single earth switch. insulator cantilever strength: 6kn, minimum creepage: 31mm/kv. 3 installation, testing, commissioning.dismantling of existing isolators andinstallation, testing, commissioning of isolators on existing structure of each bay.1 no means 04 disconnectors (02 withe/s & 02 without e/s) of one b