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Class I electrical equipment does not adhere to a specific grading system.

For Class II electrical equipment, classification is determined by the type of flammable gas encountered. This equipment is further categorized into three explosion-proof types: IIA, IIB, and IIC.

In environments utilizing Class I electrical equipment, where combustible gases other than methane are present, compliance with both Class I and Class II explosion-proof standards is mandatory.

Based on the specific properties of the متفجرة dust environment, Class III electrical equipment is segmented into three categories: IIIA, IIIB, and IIIC.