... 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 ... Practice) /KV7.27.2Leakage Distance/in (mm)4(102)5(127)Dry Arcing Distance/in (mm)2-1/4( ... (305)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) ...