One of the three errors: explosion-proof electrical equipment waterproof <br> <br> many people think, explosion-proof power distribution box explosion-proof electrical equipment has been able, because of its shell can prevent hazardous explosive gas into its interior, its The sealing performance must be good enough to prevent rainwater from entering and it should be no problem to install it outdoors for outdoor use. In fact, this is confusing the two concepts of explosion-proof electrical equipment in the form of explosion-proof and shell protection.
Explosion-proof electrical equipment is divided into different types of explosion-proof according to different explosion-proof principles. Explosion-proof explosion-proof electrical equipment is an electrical device that has an explosion pressure that withstands the explosive mixture of internal explosive gases and prevents internal explosions from propagating to the explosive mixture around the enclosure. Obviously, its explosion-proof performance has nothing to do with the degree of protection of the enclosure. The national standard does not require special protection for its enclosure. As long as it satisfies the protection requirements for the enclosure of motors and low-voltage electrical enclosures, it strictly regulates the material and mechanical strength of its enclosure. Increased safety explosion-proof electrical equipment is a device structure that does not generate arcs, sparks, or may ignite explosive mixtures at elevated temperatures under normal operating conditions. Measures are taken to increase safety to avoid these phenomena under normal and recognized overload conditions. Electrical Equipment. The intrinsically safe explosion-proof electrical equipment (commonly found in small and weak electrical equipment) is an electrical device in which the entire electrical circuit does not ignite the prescribed explosive mixture due to the electrical sparks and thermal effects generated under the specified fault conditions. These two types of explosion-proof electrical equipment either do not produce sparks and high temperatures, or sparks and thermal effects do not suffice to ignite the explosive mixture. Obviously, its explosion-proof performance is also independent of the degree of protection of the enclosure. Therefore, the national standard does not require special protection for its enclosure. .
It can be seen that the vast majority of explosion-proof electrical equipment can not prevent gas or water from entering its interior, so these explosion-proof electrical equipment can not be installed directly in outdoor open space, nor can it be flushed with water. In fact, the waterproof performance of the equipment is entirely determined by the degree of protection of its enclosure, and the degree of protection of the enclosure of electrical equipment that is normally used outdoors to protect against rainwater should be IPX5 (ie it can withstand water spray from all directions without entering the water), so it is purchased explosion-proof. When the electrical equipment is used, the protection level of the housing must be specified at the same time. The other thing to note is that the explosion-proof electrical equipment used outdoors must be corrosion resistant.
Three Mistakes two: gas explosion-proof electrical equipment can be used in dust explosion hazardous areas <br> <br> Currently, many people on the dust-proof and dust explosion-proof electrical equipment also lack a full understanding of the practical application of either gas explosion hazard Or dust explosion hazardous locations, gas explosion-proof electrical equipment are selected. In fact, this is wrong, because from the explosion-proof principle of explosion-proof electrical equipment, we can see that most of the gas explosion-proof electrical equipment enclosure protection level is lower than the dust explosion-proof electrical equipment, if the gas explosion-proof electrical equipment is used in dust explosion hazardous locations, the dust will It enters the equipment and accumulates, which will prevent the safe operation of explosion-proof electrical equipment. Of course, it is also possible to increase the degree of protection of the shell of the gas explosion-proof electrical equipment and use it in dust explosion hazardous locations, but this is extremely uneconomical because the functions such as flameproof and increased safety for gas explosion protection are wasted.
Conversely, can dust explosion-proof electric operation box equipment be used in places with dangerous gas explosions? The answer is negative. Because dust explosion-proof electrical equipment is only a high level of protection of the shell, and can not prevent the explosive gas into its shell, no explosion-proof, increased safety and other anti-explosive measures, so the two explosion-proof electrical equipment must not be replaced.
Three Mistakes three: no need to produce crush-proof electrical equipment places <br> <br> This is the rural widespread misunderstanding. In fact, explosive dust can be divided into the following four types: explosive dust, flammable conductive dust, flammable non-conductive dust and combustible fiber. Dust from agricultural products is flammable non-conductive dust. Taking buckwheat flour as an example, its explosion risk indicators are equivalent to those of red phosphorus in metals. Therefore, the explosion-proof problem of agricultural product crushing and processing places must be given enough attention, and explosion-proof electrical equipment must be selected.
Through the above information introduction, we should understand that different explosion-proof electrical equipment is suitable for different explosion-proof places, that is to say, when we purchase explosion-proof electrical products, we must judge according to the use place of the products, so as to meet the requirements of use, and we will not neglect security breaches. .
Explosion-proof electrical equipment is divided into different types of explosion-proof according to different explosion-proof principles. Explosion-proof explosion-proof electrical equipment is an electrical device that has an explosion pressure that withstands the explosive mixture of internal explosive gases and prevents internal explosions from propagating to the explosive mixture around the enclosure. Obviously, its explosion-proof performance has nothing to do with the degree of protection of the enclosure. The national standard does not require special protection for its enclosure. As long as it satisfies the protection requirements for the enclosure of motors and low-voltage electrical enclosures, it strictly regulates the material and mechanical strength of its enclosure. Increased safety explosion-proof electrical equipment is a device structure that does not generate arcs, sparks, or may ignite explosive mixtures at elevated temperatures under normal operating conditions. Measures are taken to increase safety to avoid these phenomena under normal and recognized overload conditions. Electrical Equipment. The intrinsically safe explosion-proof electrical equipment (commonly found in small and weak electrical equipment) is an electrical device in which the entire electrical circuit does not ignite the prescribed explosive mixture due to the electrical sparks and thermal effects generated under the specified fault conditions. These two types of explosion-proof electrical equipment either do not produce sparks and high temperatures, or sparks and thermal effects do not suffice to ignite the explosive mixture. Obviously, its explosion-proof performance is also independent of the degree of protection of the enclosure. Therefore, the national standard does not require special protection for its enclosure. .
It can be seen that the vast majority of explosion-proof electrical equipment can not prevent gas or water from entering its interior, so these explosion-proof electrical equipment can not be installed directly in outdoor open space, nor can it be flushed with water. In fact, the waterproof performance of the equipment is entirely determined by the degree of protection of its enclosure, and the degree of protection of the enclosure of electrical equipment that is normally used outdoors to protect against rainwater should be IPX5 (ie it can withstand water spray from all directions without entering the water), so it is purchased explosion-proof. When the electrical equipment is used, the protection level of the housing must be specified at the same time. The other thing to note is that the explosion-proof electrical equipment used outdoors must be corrosion resistant.
Three Mistakes two: gas explosion-proof electrical equipment can be used in dust explosion hazardous areas <br> <br> Currently, many people on the dust-proof and dust explosion-proof electrical equipment also lack a full understanding of the practical application of either gas explosion hazard Or dust explosion hazardous locations, gas explosion-proof electrical equipment are selected. In fact, this is wrong, because from the explosion-proof principle of explosion-proof electrical equipment, we can see that most of the gas explosion-proof electrical equipment enclosure protection level is lower than the dust explosion-proof electrical equipment, if the gas explosion-proof electrical equipment is used in dust explosion hazardous locations, the dust will It enters the equipment and accumulates, which will prevent the safe operation of explosion-proof electrical equipment. Of course, it is also possible to increase the degree of protection of the shell of the gas explosion-proof electrical equipment and use it in dust explosion hazardous locations, but this is extremely uneconomical because the functions such as flameproof and increased safety for gas explosion protection are wasted.
Conversely, can dust explosion-proof electric operation box equipment be used in places with dangerous gas explosions? The answer is negative. Because dust explosion-proof electrical equipment is only a high level of protection of the shell, and can not prevent the explosive gas into its shell, no explosion-proof, increased safety and other anti-explosive measures, so the two explosion-proof electrical equipment must not be replaced.
Three Mistakes three: no need to produce crush-proof electrical equipment places <br> <br> This is the rural widespread misunderstanding. In fact, explosive dust can be divided into the following four types: explosive dust, flammable conductive dust, flammable non-conductive dust and combustible fiber. Dust from agricultural products is flammable non-conductive dust. Taking buckwheat flour as an example, its explosion risk indicators are equivalent to those of red phosphorus in metals. Therefore, the explosion-proof problem of agricultural product crushing and processing places must be given enough attention, and explosion-proof electrical equipment must be selected.
Through the above information introduction, we should understand that different explosion-proof electrical equipment is suitable for different explosion-proof places, that is to say, when we purchase explosion-proof electrical products, we must judge according to the use place of the products, so as to meet the requirements of use, and we will not neglect security breaches. .
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