• The Ex-groups classify the combustible gases and vapours
according to their relative minimum ignition electrical current:
• Group I: For areas of danger of firedamp (gases, no dust,
mining only)
• Group II: For all other hazardous areas (gases only, no
dust, no mining)
Ex-Groups and minimum ignition current
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Group MIC - ratio*
(Minimum Ignition Current)
IIA > 0.8
IIB 0.45 ... 0.8
IIC < 0.45
*relative to Methane
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