When purchasing equipment, how do I determine whether it needs to be explosion-proof? Does explosion protection for equipment refer to explosion protection for the motor? How is the explosion protection rating determined? Is the area’s explosion protection rating the same as its fire hazard rating?

First, identify the hazardous gases present at the site. Based on these gases, select explosion-proof electrical equipment with the appropriate explosion-proof rating; for example, in ordinary factories, ExdIIBT4 rated explosion-proof electrical equipment is sufficient. If acetylene is present, then ExdIICT4 rated equipment is needed, and if combustible dust is present, dust-proof explosion-proof electrical equipment should be used

For such issues, it is best to go to the equipment department or the safety and environmental protection department at your workplace to find relevant information; they will provide you with a proper explanation. If you work in one of these departments but are not sure, then consult the local **regulatory authorities.

This should be asked to the process team; they should be aware of what hazardous gases exist and their properties. Or it could be asked to the electrical team, as they should also know

1. The explosion-proof zone classification of the facility is determined during the design phase by referring to relevant standards based on the process characteristics. 2. Based on the classification of explosion-proof areas, the explosion-proof requirements for electrical instruments were specified one by one. 3. When purchasing equipment, purchases are made in accordance with the requirements put forward by the requesting departments, so that the purchased equipment meets the users’ needs. 4. It is necessary for the procurement department to understand the specifics of these classifications; however, determining how to classify equipment involves many aspects, and it can be somewhat complicated to learn. If you want to learn, go ahead.

This post was last edited by liuyudzh on 2019-2-21 at 15:11. China uses a method equivalent to that of IEC for classifying explosive-hazardous areas. **Standard GB 50058-92 specifies that explosive gas hazardous areas are classified into three levels – Zone 0, Zone 1, and Zone 2 – depending on their degree of hazard, while explosive dust hazardous areas are divided into two levels – Zone 10 and Zone 11. See Table 4-1 for details.     Table 4-1 Classification of Hazardous Areas in China for Explosive Substances Area Classification Definition of Areas Gases Zone 0: An environment where explosive gas mixtures are present continuously or for an extended period. Zone 1: An environment where explosive gas mixtures may occur during normal operation. Zone 2: An environment where explosive gas mixtures cannot occur during normal operation, or if they do appear, it is only for a short time. Dusts Zone 10: An environment where explosive dusts are present continuously or for an extended period. Zone 11: An environment where accumulated dust may occasionally be disturbed, resulting in the formation of explosive dust mixtures

The explosion protection rating and fire hazard rating for the area seem to be classified differently

It seems it has been changed to be divided into zones 20, 21, and 22.

This national standard has strict regulations, especially regarding safety; not the slightest carelessness is allowed. The process and electrical departments of the design firm determine this in accordance with the standards.