... 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 ... Pin Height/Average/lb (kN)3,000(13.3)2,500(11.1)Average Flashover VoltageLow-frequencyDry/kV35355045Wet/kV20202525Critical-impulsePositive ... the distance over them is included in the leakage distance.2.Top-and wire groove shall seat a mandrel with ...