IEC 60052 sets forth recommendations concerning the construction and use of standard air gaps for the measurement of peak values of the following four types of voltage:
a) alternating voltages of power frequencies;
b) full lightning impulse voltages;
c) switching impulse voltages;
d) direct voltages.
Air gaps constructed and used in accordance with this standard represent IEC standard measuring devices in accordance with IEC 60060-2 and are primarily intended for performance checks of high voltage measuring systems.
BS EN 60052:2002 history
2003BS EN 60052:2003 Voltage measurement by means of standard air gaps
2003BS EN 60052:2002 Voltage measurement by means of standard air gaps
1960BS 358:1960 Method for the measurement of voltage with sphere-gaps (one sphere earthed)