The “abc” represents gas classifications, categorized into three levels—IIA, IIB, and IIC—according to the maximum experimental safe gap (MESG) or the minimum igniting current (MIC).
Kategoria stanu | Klasyfikacja gazów | Reprezentatywne gazy | Minimalna energia iskry zapłonowej |
---|---|---|---|
Pod Kopalnią | I | Metan | 0.280mJ |
Fabryki poza kopalnią | IIA | Propan | 0.180mJ |
IIB | Etylen | 0.060mJ | |
IIC | Wodór | 0.019mJ |
Of these, the IIC classification is deemed the most hazardous, with IIB and IIA following in decreasing order of risk. Gases falling under the IIC classification include hydrogen, acetylen, dwusiarczek węgla, ethyl nitrate, and water gas. Those in the IIB category encompass ethylene, coke oven gas, propyne, I wodór sulfide. The IIA classification includes gases such as methane, etan, benzen, I diesel.