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Explosion-proof enclosure ratings commonly adopted in factories are IIB and IIC.
Explosion-proof products are classified into two types, dI and dIIBT4:
dI is designated for non-mining areas in coal mines.
dIIBT4, used in manufacturing settings, is suitable for explosive gas mixtures categorized under Classes IIA and IIB, from Group T1 to T4. This product adheres to the JB/T8528-1997 standard requirements. Explosion-proof models conform to both the GB3836.1-2000 standard and the JB/T8529-1997 standard.