【 Weak current College 】 electrical fire-explosion hazardous areas-electrical equipment-Power By 【 China power house network 】

Electrical equipment and wiring of electrical discharge or electrical equipment surface temperature is too high can cause explosive mixtures. In order to guarantee security, according to the electrical equipment and wiring and electrical equipment produced by EDM surface of the heating temperature, take all measures to enable these explosion-proof electrical equipment and wiring in explosion hazardous areas. An explosion hazardous areas by type and grade of explosion hazardous areas, is flammable and explosive substances in the production, use and storage process, be able to form an explosive mixture, or explosive mixtures can be intrusive. According to the likelihood of accidents and their consequences, risk and physical condition, the explosion hazardous areas classified as second class five levels, with a view to taking appropriate measures to protect against electrical equipment and wiring explosion and fire. First class: a gas or vapour explosion explosive mixture of dangerous places, divided into three levels. Q a 1 level places: under normal circumstances can form explosive mixtures in the workplace, it includes the normal driving, running, stopping, for example open loading, unloading, etc. Q a 2-level places: under normal circumstances could not form, but only in unusual circumstances can form explosive mixtures. Abnormal situation including plant or equipment of accident damage, improper operation, maintenance and installations or equipment dismantling, repair, etc. Q a 3-level places: is not normally the whole space formation of explosive mixtures are less likely. The second category: there is dust or the explosion of an explosive mixture of fiber dangerous places, classified as level 2. G a 1 level places: under normal circumstances can form explosive mixtures. For example: aluminium powder, flour, sulfur powder and other production equipment of internal space, powdered plastic, resins, etc. of air drying equipment in the space. G a 2-level places: under normal circumstances could not form an explosive mixture. That is, 6 1 production equipment of the factory interior space to a 2-level 6. The second explosion-proof electrical equipment of the type of explosion-proof electrical equipment, explosion-proof safety (A flag), explosion-proof (symbol B), explosion-proof filling oil type (mark G), explosion-proof ventilation inflatable type (mark E), explosion-proof safety Sparks (mark H), explosion (symbol T). 1 · the nature of the explosive mixtures use explosion-proof electrical equipment if you already know the explosive mixtures, use explosion-proof electrical equipment can use table 3 a 7 to the explosive mixture is in the first few lines, which column, and then in the table 3 a 8 select suitable explosion-proof electrical equipment. If in the same place within multiple explosive mixtures should be selected according to the risk of explosion-proof electrical equipment. For General site with explosion risk, also can choose the most common model, B3c, B3d-motor, B3c, B4c-lighting and COe, AOd-explosion-proof switch. In this way, only a few substances such as water, hydrogen, acetylene, carbon disulphide, selection is required further consideration, for the vast majority of explosive mixtures are satisfied. This is generally the production of these models.