Experimental determination of minimum ignition current (MIC) ratio of hydrogen/methane (H2NG) blends up to 20Â vol.% of hydrogen

The interpretation of our results would lead us to conclude that methane/hydrogen mixtures containing 16 vol.% of hydrogen or more should be Group IIB gases. However, other results available in scientific literature and standards lead to the conclusion that these concentrations would still remain within the Group IIA classification. This issue was recently discussed in the IEC subcommittee 31 M of the International Electrotechnical Commission, in order to resolve this contradiction.