According to the national explosion -proof electrical equipment standards "Electric Equipment for Explosive Gas Environmental Electric Electric Electric Equipment" and "FCHD Environmental Electric Electric Electric Electric Equipment", my country's explosion -proof is divided into explosive gas environment and flammable dust environment, and the corresponding explosion -proof areas are divided into explosive gas Area and combustible dust areas.

Explosive gas areas and flammable dust areas are divided into three types according to the frequent degree and duration of explosive gas or combustible dust. Area 0 or 20: refers to an environment where explosive gases or flammable dust occur continuously or for a long time; area 1 or 21: refers to an environment where explosive gas or flammable dust may occur during normal operation; : It refers to an environment where explosive gas or flammable dust cannot occur during normal operation or the environment where explosive gases or flammable dust are existed in short -term.