... Insulator: ANSI Standard Insulator: 55-1,55-2,55-3,55-4,55-5,55-6,55-7 ANSI55-155-2Insulator ... 2Leakage Distance/in (mm)4(102)5(127)Dry Arcing Distance/in (mm)2-1/4(57)3-3/8(86)Minimum Pin ... Height/Average/lb (kN)3,000(13.3)2,500(11.1)Average ... groove shall seat a mandrel with a diameter of 1-3/4 inches. LOW AND MEDIUM VOLTAGE PIN TYPE INSULATOR(ANSI STANDARD ...