... fine protection and low residual pressure (series) Ground resistance/diameter: ≤4Ω/ 2.5m Executive standard: GBl8802.1,lEC61643-1 Other feature ... contact discharging,±15KV air discharge IEC61000-4-3(RS):10V/m(80~1000MHz) IEC61000-4-4(EFI):power line ±4KV,data line ... Part 15/EN55022,Class A&B IEEE1613(electric substation),EN50121-4(traffic track) Order Information (Packed in standalone and card type, ...