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 ... )Leakage Distance/in (mm)4-1/2(114)5(127)6-1/4(159)Dry Arcing Distance/in (mm)5(127 ... )5(127)6(152)Cantilever Strength/Average/lb (kN)2,500(11)3 ...