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The difference between explosion-proof mark Exde and Exed in explosion-proof distribution box
Release time:
2024/07/04
The difference between explosion-proof mark Exde and Exed in explosion-proof distribution boxI believe many people don't have much concept of these two explosion-proof signs. Now let's briefly introduce the difference between the two:
First of all, we will introduce the meaning of each letter in the explosion-proof sign. I believe that the first two letters Ex of the explosion-proof sign should not be very strange to these two letters, because this is the most essential difference between the explosion-proof distribution box and the ordinary distribution box.Explosion-proof distribution boxThe surface of the box is engraved with such signs, some of which come with the box mold itself, and some of which are welded to the box. Because of the existence of these two letters, it also allows ordinary distribution boxes and explosion-proof distribution boxes to be directly separated in appearance.
First, the third letter of the explosion-proof sign is also the key to the difference. If the third letter is E, then the fourth letter is D. The explosion-proof sign together is Exed, which means that the box of the explosion-proof distribution box isincreased safety typeYes, the components inside areFlameproof typeof.
Second, the third letter of the explosion-proof sign is also the key to the difference. If the third letter is D, then the fourth letter is E. The explosion-proof sign is Exde together, which means that the box of the explosion-proof distribution box isFlameproof typeYes, the components inside areincreased safety typeof.
The difference between Exd and Exe
1. the two definitions are different
1. Flameproof enclosure "d": an explosion-proof type of electrical equipment, the enclosure can withstand the explosive mixture that enters the interior of the enclosure through any joint surface or structural gap of the enclosure without being damaged, and will not cause external ignition of an explosive gas environment formed by one or more gases or vapors. (by GB3836-2010 definition)
Summary: a) The shell can withstand internal explosion; B) the inside of the shell cannot explode after explosion. The built-in components are ordinary components.
Increased safety type "e": an explosion-proof type of electrical equipment, that is, to take some additional measures to improve the safety of electrical equipment, to prevent the possibility of dangerous temperature, arc and spark under normal operation or specified abnormal conditions.
In short, its internal itself does not produce the possibility of dangerous temperatures, arcs and sparks, but only to improve its safety, such as improving the level of protection. The built-in elements must have Ex marking elements (explosion-proof elements).
2. two different shell structure type
1. Flameproof type "d" must be designed to release energy (simply flange surface) because it must bear internal explosion pressure. The average wall thickness of the shell is thicker than that of the safety-increasing type.
2. Increased safety type "e" has no flange surface because the internal itself does not generate the possibility of dangerous temperature, arc and spark.
3. Other
1. Only flameproof type "D" and intrinsically safe type "I" are divided into ⅡA, ⅡB and ⅡC; However, safety-increasing type does not distinguish between ⅡA, ⅡB and ⅡC.
2. As a wiring cavity, the flameproof "D" introduction device must be "D" (flameproof) introduction. Its sealing ring is longer than the safety-increasing sealing ring. The safety-increasing introduction device only needs to reach to improve its safety level.
3. The flameproof "D" shell must be subjected to hydraulic pressure test (Class II B 1.5MPa/10 seconds water pressure, Class II C 2.0MPa/10 seconds water pressure), while the safety-increasing type is not required.
4. Flameproof "D" shell must be subjected to impact test (impact test when a test object with a mass of 1kg falls vertically from a height of 0.7m), and increased safety shell must not be subjected to impact test.
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