procurement testing erection and commissioning of 1 set of 420 kv 2500 a center rotating horizontal double break hdb type outdoor isolators with earth switches 420 kv 2000 a along with dismantling of existing chinese make isolator and retrofi procurement testing erection and commissioning of 1 set of 420 kv 2500 a center rotating horizontal double break hdb type outdoor isolators with earth switches 420 kv 2000 a along with dismantling of existing chinese make isolator and retrofitting , procurement, testing , erection & commissioning of 1 set of 420 kv / 2500 a center rotating horizontal double break (hdb) type outdoor isolators with earth switches 420 kv / 2000 a along with dismantling of existing chinese makeisolator and retrofitting of new one at switch yard under emoph department , sgtpp / wbpdcl through opex: 2024-25 , isolator set, hdb, 420kv, 2500a, 3ph for ict 400kv power circuit ,420kv 2500a 3 phase horizontal double break isolator with individual earth switch ,6 no mom boxes ,connectors insulator stack and base channel .individual motor for local & remote operation.stc-50ka ( center rotating ) , 400 kv hdb isolator service job ( a)complete dismantling of 3ph, 420kv,m/s pinggao group ltd make knee type isolators and earth switch including insulators, base channels<(>,<)> pipes, mom boxes etc and shifting to store site. b) installation / retrofit, erection & commissioning of 3 pole 420 kv/2500a horizontal centre rotating double break isolators and earth switch along with base channels, insulator stacks, mom boxes, down pipes etc on the existing support structure. any thing additional required for completeness of the service job. )