Applied in moisture places containing corrosion explosive gas as well as non-conductive dust.

Applicable Ⅱ A, Ⅱ B, IIC explosive gas mixtures, temperature class T1 ~ T6 of 2 sites; non-conductive flammable dust atmospheres 20, Zone 21 and Zone 22 places. For oil exploration, refining, chemical, military, marine, electric power and other hazardous environments and oil platforms, oil tankers and other places for work-proof lighting.