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The currently published tables for maximum capacitances within the intrinsic safety standard (IEC / AS/NZS 60079-11) are believed to be erroneous at least as far as Group I is concerned.
This ACARP Project aims to define by testing the correct and reliable capacitive discharge ignition values in respect to charging voltage. The voltage - capacitance-ignition relationship tabulated in this preliminary report will give some idea of improvement that can be made to the existing (IEC / AS/NZS 60079-11) A.2 Table capacitance values for Group I. On completion of all the testing the tabulated results will be presented to the International Standard Committee for inclusion into the IEC/AS/NZS 60079-11 Electrical apparatus for explosive gas atmospheres Part 11: Intrinsic safety "i".