... Cap and Pin Type Insulator: ANSI Standard Insulator: 55-1,55-2,55-3,55-4,55-5,55-6,55-7 ANSI55-155-2Insulator TypePlainRadio Freed PlainRadio FreedNeck ... (mm)2-1/4(57)3-3/8(86)Minimum Pin Height/Average/lb (kN)3,000(13.3)2,500(11.1)Average ... 152)Cantilever Strength/Average/lb (kN)2,500(11)3,000(13)3,000(13)Average Flashover VoltageLow-frequencyDry/kV655570658580Wet/kV353040354545Critical-impulsePositive ...