Description: How flammable gases and dusts are classified into groups based on ignition properties. Covers MESG and MIC ratio, theIIA/IIB/IIC hierarchy, the IIB+H2 certification shortcut, why hydrogen is a special case, dust groups IIIA/IIIB/IIIC, conductive vs non-conductive dust, dual ignition mechanisms for dust, and theNEC/CEC letter-based equivalents. Based on IEC 60079. More info: https://exknowledge.com