... quality in its raw material and high technics. Specification:1) Porcelain or glass insulators for low & medium or high voltage2) Voltage: ... 56-3,56-4,56-5Pin Type Insulator for low & medium voltage lines (ANSI): 55-1,55-2,55- ... ALP22/520,ALP22/920c. Post insulatorsPost insulators for high voltage lines (ANSI): 57-1s,57-2s,57-3s, ... attention. ANSI standard stay porcelain insulators for low voltage line