Classification method for explosion-proof levels of electric heaters

Classification method for explosion-proof levels of electric heaters

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Firstly, explosion-proof electric heaters are divided into two categories: Class I refers to electrical equipment used underground in coal mines; II refers to electrical equipment used in places other than mines. Class II electrical equipment is further divided into: IIA IIB IIC and three other types.

Secondly, it is necessary to know the distinction of explosion-proof levels. First, it is necessary to know the grouping of explosive gas mixtures according to their ignition temperature: groups are indicated by T1. T2. T3. T4. T5. T6, and the ignition temperature is indicated by t ( degree ). Additionally, the ignition temperature for T1 group is:; 450 degree ＜ t; T2 is: 300 degree ＜ t Less than or equal to 450 degree ; T3 is: 200 degree ＜ t Less than or equal to 300 degree ; T4 is: 135 degree ＜ t Less than or equal to 200 degree ; T5 is: 100 degree ＜ t Less than or equal to 135 degree ; T6 is: 85 degree ＜ t Less than or equal to 100 degree .

Once again, it is important to know the explosion-proof types of electrical equipment, which can be divided into: explosion-proof type, symbolizing d; Enhanced safety type, symbolized by: e; Positive pressure type, symbolizing P; Intrinsically safe, symbolized by i; There are also: oil filled, sand filled, pouring and sealing types, etc.

After knowing these points, one will have a great understanding of the distinction between explosion-proof levels. Explosion proof electrical equipment is based on the type of equipment used; The temperature group of explosive gas mixtures; The explosion-proof electrical equipment is distinguished based on its explosion-proof type, for example, the explosion-proof symbol is dIIBT4, which represents that the explosion-proof electrical product is of explosion-proof type and is used in Class IIB (Class) locations, with an ignition temperature of T4 for explosive gases.