What Does Explosion-Proof Level ABC Mean

I “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).

Isigaba Sesimo	Ukuhlukaniswa Kwegesi	Amagesi amele	I-Minimum Ignition Spark Energy
Ngaphansi Kwemayini	I	I-Methane	0.280mJ
Izimboni Ngaphandle Kwezimayini	IIA	I-Propane	0.180mJ
	IIB	I-Ethylene	0.060mJ
	I-IIC	I-hydrogen	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, i-acetylene, carbon disulfide, ethyl nitrate, and water gas. Those in the IIB category encompass ethylene, coke oven gas, propyne, futhi i-hydrogen i-sulfide. The IIA classification includes gases such as methane, ethane, benzene, futhi diesel.