FXBW4-110 / 120 composite suspension insulator insulator type structure height H.mm minimum arc distance L.mm minimum nominal creepage distance mm full-wave lightning impulse withstand voltage kV (peak value) of not less than impulse wet withstand voltage kV (peak ) Not less than power frequency withstand voltage kV (rms) of not less than wet FXBW1-110 / 120 1180 ± 15 1000 2520 550 - 280 230 FXBW2-110 / 120 1240 ± 15 1060 2520 550 - 280 230 FXBW3-110 / 120 1180 ± 15 1000 3150 550 - 280 230 FXBW4-110 / 120 1240 ± 15 1060 3150 550 - 280 230