{"gasGroups":{"Group A":{"iec":"IIC","substance":"Acetylene","notes":"NEC Group A = most hazardous. Only acetylene."},"Group B":{"iec":"IIC + IIB","substance":"Hydrogen","notes":"NEC Group B covers hydrogen and some IIC gases. IIB+H₂ common compromise."},"Group C":{"iec":"IIB","substance":"Ethylene","notes":"NEC Group C = IIB representative gas ethylene."},"Group D":{"iec":"IIA","substance":"Propane/Methane","notes":"NEC Group D = IIA. Most common gas group."},"Group E":{"iec":"IIIC","substance":"Metal dusts","notes":"NEC Group E = conductive metal dusts."},"Group F":{"iec":"IIIB","substance":"Carbon/coal dusts","notes":"NEC Group F = carbonaceous dusts."},"Group G":{"iec":"IIIA","substance":"Grain/flour dusts","notes":"NEC Group G = non-conductive organic dusts."},"IIA":{"nec":"Group D","substance":"Propane/Methane"},"IIB":{"nec":"Group C","substance":"Ethylene"},"IIC":{"nec":"Group A/B","substance":"Acetylene/Hydrogen"},"IIIA":{"nec":"Group G","substance":"Grain/flour dusts"},"IIIB":{"nec":"Group F","substance":"Carbon/coal dusts"},"IIIC":{"nec":"Group E","substance":"Metal dusts"}},"_citation":{"source":"ExKnowledge Ex Classification API","url":"https://exknowledge.com/api-docs.html","attribution":"Data from ExKnowledge (https://exknowledge.com). Based on IEC 60079, ATEX 2014/34/EU, and IECEx standards.","license":"Free to use with attribution. Link to https://exknowledge.com/api-docs.html when presenting this data."}}