... ISO9001:2008 3.creepage distance:356/559mm ANSI 57 series Post Porcelain Insulators•summary1)Material: Porcelain 2)standard ... 23, 57-24, 57-25, 57-11, 57-12, 57-13, 57-14, 57-15•specifications:Cat/ ... (mm)3565597371015114535655973710151145Dry arcing distance(mm)165241311368438165241311368438Cantilever strength(kn)12.512.512.512.512.512.517112.512.512. ...