Classification of explosion-proof zones for open-flame equipment

I would like to ask which standard specifies that the area within 5 meters around open-flame equipment should be designated as a non-explosion-proof zone? GB50058-92 does not have such a provision.

This post was last edited by hzlxsj on 2010-9-12 at 11:45. According to Section 2.2.2 of GB59958-92, areas near equipment that uses open flames during production, or near equipment whose surface temperature of hot components exceeds the ignition temperature of flammable materials in that area, can be classified as non-explosion hazardous areas. However, the clause does not state that it is within a 5m range. There is no clear specification regarding the exact distance range that is meant by \"this vicinity\".

Classification of explosion-proof areas: The explosive gas environment is divided into 3 hazard zones: (1) Zone 0: An environment where explosive gas mixtures are present continuously or for an extended period of time； (2) Zone 1: An environment where explosive gas mixtures may occur during normal operation ； (3) Zone 2: An environment in which an explosive gas mixture may occur during normal operation, or an environment in which such a mixture exists only for a short period of time, if at all. The classification of hazardous areas in oil depots was covered in the initial training, so it will not be repeated here. By understanding this classification, we can be aware of the risks associated with the area in which we are working. Moreover, for different hazardous areas, we can select appropriate explosion-proof electrical equipment and implement different protective measures to achieve the best preventive effects. Classification of dust explosion hazard areas: Zone 20: Areas where combustible dust is present continuously or frequently during normal operation, in amounts sufficient to form a combustible dust-air mixture or to potentially create uncontrollable and extremely thick layers of dust. Zone 21: During normal operation, there may be enough dust present to form a flammable mixture with air, but it does not fall under Zone 20. Zone 22: Areas where, under abnormal conditions, flammable dust clouds occasionally appear and exist for only a short time, or where flammable dust occasionally accumulates or dust layers may be present, thereby creating flammable dust-air mixtures.