[Help] Under what circumstances should an explosion-proof motor be used when selecting a pump?

Electrical equipment for explosive hazard environments should be selected based on the hazard level of the installation location, the group and category of hazardous substances, as well as the type and operating conditions of the electrical equipment. The group and category of the selected electrical equipment shall not be lower than those of the hazardous substances present in that environment. Relevant information is provided below for reference: An explosive hazard area refers to a place where there is a risk of explosion due to the presence of explosive mixtures, and therefore preventive measures must be taken regarding its production, use, storage, and handling. Based on the degree of risk of fire and explosion as well as the state of the hazardous materials, gas and vapor explosion hazard areas are classified as follows: Zone 0 refers to environments where explosive gas mixtures are present continuously or for extended periods during normal operation. Zone 1 refers to environments where explosive gas mixtures may occur under normal conditions. Zone 2 refers to environments where explosive gas mixtures are not likely to occur under normal conditions but may appear occasionally under abnormal circumstances. According to the physical properties of the explosive mixtures, they are divided into three categories: Category I includes methane in mines; Category II includes explosive gases, vapors, and mists; Category III includes explosive dusts and fibers. Explosive gases are classified according to their ability to propagate explosions, using methods such as the maximum test gap method or the minimum ignition current ratio, resulting in classifications of IIA, IIB, and IIC. Explosive substances are grouped based on the lowest temperature at which an explosive mixture can be ignited when tested using standard methods; explosive substances in Category II are divided into six groups: T1, T2, T3, T4, T5, and T6. Electrical equipment used in areas with explosion hazards must have a structure that prevents sparks, arcs, or high temperatures generated during use from becoming sources that ignite explosive mixtures in those areas. Depending on the environment in which they are used, explosion-proof electrical equipment is classified as Type I for use in coal mines and Type II for use in factories. Based on their explosion-proof design, electrical equipment is further categorized into flameproof types, increased safety types, oil-immersed types, positive pressure types, intrinsically safe types, sand-filled types, spark-free types, and special types.

Thank you very much, I understand, thanks!