Reference Current (Iref) IEEE and IEC
The peak value of the resistive component of a power-frequency current high enough to make the effects of stray
capacitance of the arrester negligible. This current level shall be specified by the manufacturer.
Note Depending on the arrester design, the reference current will typically be in the range
of 0.05 mA to 1.0 mA per square centimeter of disk area.