This standard specifies the measurement method for measuring AC voltage peak values with a frequency of 100 Hz or less and an effective voltage value of 10 kV or more using a standard bulb gap in electrical equipment and other high voltage tests.
JIS C 1001:1994 history
2010JIS C 1001:2010 Voltage measurement by means of standard air gaps
1994JIS C 1001:1994 Voltage measurement method with sphere gap