bids are invited for custom bid for services - replacement of porceline make pin insulator and installation of polymer make pin insulators each pole consisting of ryb phase in place of porcelain make insulator at 33kv overhead line from bcpllepetkata to raw waterintake r.. , custom bid for services - replacement of old porceline make disc insulator and installtion of composit polymer make disc insulators each phase disc insulatorin place of porcelain make insulator at 33kv overhead line per phase from bcpllepetkata to ra.. , custom bid for services - replacement and instalation of faulty 400a goab gang operated air break switch at 33kv overhead line of railway siding lalmati including manpowertools and tacklesladder etc as per requirement for changing the insulators sup..