| minimum current in a test circuit that causes ignition of the explosive test mixture in the spark test apparatus Note 1 to entry: This note applies to the French language only. Note 2 to entry: The test circuit is specified in ISO/IEC 80079-20-1, Explosive atmospheres – Part 20-1: Material characteristics for gas and vapour classification – Test methods and data. Note 3 to entry: The spark test apparatus is specified in IEC 60079-11, Explosive atmospheres – Part 11: Equipment protection by intrinsic safety "i".
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