Explosion proof measures and technical requirement

2022-08-09
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Explosion proof measures and technical requirements for air tight electrical equipment

the air tight shell of air tight electrical equipment is generally made of metal materials, which are introduced when the time is ripe. All parts of the shell are sealed by welding, extrusion or gluing of metal and metal or metal and glass, but gaskets are not allowed to be used for sealing. Gas tight enclosure is a completely sealed enclosure that can prevent the invasion of gas, dust, solid and liquid. Air tight electrical equipment includes air tight electrical equipment as a whole and air tight electrical components. Airtight electrical components cannot be used alone in explosive environment. The shell structure of air tight electrical equipment shall ensure that it remains air tight during its service life and pass the air tightness test. The air tight housing cannot be opened during use. If the housing is opened, the air tightness of the housing will be damaged. It can be reused only after re sealing and air tight test are carried out. For the gas tight shell made of metal material, if the flange connection is used to guide the relevant units to calibrate the instruments and equipment for novel coronavirus detection such as PCR instrument, then the flange must be welded or glued around, and the width of the glue shall not be less than 6mm, so as to ensure good air tightness. The airtight enclosure should minimize joints. If the sealing of air tight electrical equipment and air tight electrical components uses adhesive, they must pass the thermal stability test first, and then do the air tightness test. They can be used only after passing the test. The main auxiliary device of air tight electrical equipment is the cable entry device on the shell. When the cable or lead passes through the shell wall, protective measures shall be taken to prevent the cable and lead from mechanical damage. The minimum distance between two exposed conductors in the cable or lead passing through the shell wall is 20% of the electrical clearance value specified in the table. The minimum problem is increasingly required to be no less than 2mm. Cables and wires passing through the shell wall shall be strictly sealed, and the thickness of the sealing filler layer shall not be less than 2mm. During sealing pouring, bubbles are not allowed to accumulate in the solidified sealing filler, and the sealing performance cannot be affected by temperature and climate changes. The sealing performance of the cable entry device is good or bad. Therefore, the rapid development trend of such machinery and equipment affects the air tightness of the air tight housing and the explosion-proof performance of the air tight electrical equipment. Therefore, the air tightness of the cable entry device is very important

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