Seeking advice on selecting explosion-proof electrical equipment
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Everyone, let’s discuss the issues related to choosing explosion-proof electrical equipment. What factors influence these choices? For example, from what perspectives such as fire classification should considerations be made? It would be great if standards could be provided. Thank you!
EX——General explosion-proof mark； 5 Z3 n’ K& G; P3 F1 L; Z2 `0 _8 X d——Structural type, flame-proof ； 6 |) 4 f$ }4 K2 a: Z TI 450< t 4500 e% I+ U+ C. d) T& @- E. IIC ≤ 0.5
You can take a look at the GB3836 series of standards at http://ishare.iask.sina.com.cn/f/4841316.html
One additional question: For buildings classified according to fire hazard categories, there are at least two levels of fire resistance required; how is it determined which level to choose? For example, for Class A fire hazard, there are Grade 1 and Grade 2 fire resistance ratings. Under what circumstances is Grade 1 used and when is Grade 2 used? How is this determined? Thank you
Are explosion-proof electrical devices designed primarily for use in environments with explosive gases? If there is no such environment, then there is no need to consider explosion-proof electrical devices. Only after that should the appropriate type of explosion-proof device be chosen based on the level of hazard in the environment Is that the case? Please, an expert, explain it.
Reply to 5# Rainbow Environmental Protection: Additionally, flammable dust also requires explosion protection
Reply to 6# wdzcl0536: Can we ignore the conditions related to combustible solids then? Right?
Reply to 7# Rainbow Ring: By combustible dust, is meant something that is fixed in place. Dust can be generated whenever there is fixed crushing or similar processes involving flammability; for example, in corn silo equipment and in the drying sections for starch, dust explosions are possible.