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).

Udidi lwemeko	Ukuhlelwa kwegesi	Iigesi ezimele	Ubuncinci beNtlantsi yokuLawula amandla
Ngaphantsi koMgodi	I	IMethane	0.280mJ
Iifektri eziNgaphandle koMgodi	IIA	Ipropane	0.180mJ
	IIB	Ethylene	0.060mJ
	IIC	Ihydrogen	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, iacetylene, carbon disulfide, ethyl nitrate, and water gas. Those in the IIB category encompass ethylene, coke oven gas, propyne, kwaye ihydrogen sulfide. The IIA classification includes gases such as methane, ethane, benzene, kwaye diesel.