... . Specification:1) Porcelain or glass insulators for low & medium or high voltage2) Voltage: 0.4KV~132KV3) The disc suspension insulator ... J,st-20/J,p-20-DType insulators for high voltage (AS): LP,LV,SLP11/180,ALP11/275,ALP22 ... 480,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