ANSI line post insulators for high voltage

CLASS ANSI   57-1S 57-1L 57-2S 57-2L 57-3S 57-3L 57-4S 57-4L 57-5S 57-5L Fig No. 3 4 5 1 2 Main Dimansions of the pin mm M16 M20(M16) M20 M20 M20 Creepage distance mm 356 559 737 1015 1145 Dry arcing distance mm 165 241 311 368 438 Cantilever strength kN 12.5 12.5 12.5 12.5 12.5 Low frequency flashover voltage Dry flashover kV 80 110 125 150 175 Wet flashover kV 60 85 100 125 150 Critical impulse flashover voltage Postive kV 130 180 210 255 290 Negative kV 155 205 260 340 380 Radio influence voltage data test voltage to ground kv 15 22 30 44 44 At 1000kHZ Max.RIV �� V 100 100 300 200 200 Weight(kg) 5 9.8 12 16 18