... and transmission line upto 132KV. 57 Series Line Post Insulator Line Post Insulator used on distribution line and transmission line upto 132KV ... , 16KN. Main type: ANSI C29.7 type: 57-1, 57-2, 57-3, 57-4, 57-5, 57-11, 57-12 ... Approx(kg)5.09.5111618Number in standard package63322 line post insulator 57-2