tender for post insulator for 25 kv isolator and bus bars ( ri - 6090 ) as per rdsosspecn. no. ti/spc/ohe/ins/0070 ( 4/2007 ).main estimate no.104/deposit/15-16 dtd. dtd. 12.01.2016 subestimate no : 46/d/trd/asn/15-16 dtd. 12/01/16, make rdso/core approved sources.