There are several explosion-proof levels of explosion-proof control box, how to choose
Explosion proof equipment is suitable for hazardous production environment. There are many kinds of explosion-proof control boxes and cabinets. How to select the explosion-proof grade of explosion-proof control box? Which level of explosion-proof control is better? Let's see.
The explosion-proof level of explosion-proof control box is divided into three levels: IIA, IIB and IIC. Grade IIC is higher than grade IIB and IIA. Prices should also be higher. Many customers do not know what explosion-proof grade to choose. In fact, the explosion-proof grade is related to the flammable and explosive gas mixture in the place of use. For example, the explosion-proof electrical apparatus grade corresponding to hydrogen is IICT1. The corresponding grade of carbon monoxide is IIAT1. The explosion-proof control box it uses is also IIAT1. In reality, IIB is basically used to replace the grade. Please refer to "Introduction to Explosive Mixtures" for specific classification
For example, a workshop needs to install 5 explosion-proof control boxes. In the production process, the workshop will produce ethanol. The explosion-proof control box must be above IIAT2. It can be IIBT2-6 or IICT2-6. The general practice is IIBT4.
Property: ratio of small ignition current of explosive mixture of gas and steam to small ignition current of explosive mixture of methane. According to Chinese regulations, hazardous substances in steam are classified into Class IIA, Class IIB and Class IIC according to the very small ignition current ratio. If the ignition current ratio is very small ≤ 1.0 and>0.8, it is Class IIA; Those ≤ 0.8 and>0.45 are Grade IIB; Those ≤ 0.45 are Grade IIC. For example, ethane, ethylene and acetylene are Class IIA, Class IIB and Class IIC hazardous substances respectively.
How to select the control box?
All buildings requiring integrated circuits will use explosion-proof control boxes. The current buildings are powered by the central grid, but they need to be distributed to different rooms for trial use. The existence of distribution box is to distribute the daily power consumption of residents more reasonably.
The current control box materials can be divided into wood and metal, because metal control boxes are usually explosion-proof control boxes, which are more widely used in practical applications, and the level of protection will be far higher than ordinary control boxes. Therefore, it can ensure that the use of metal control boxes is safer in the daily life of residents, and no power accidents will occur.
