Many customers when buying explosion-proof motor, I don't know the explosive-proof grade is what meaning, don't know what I should use level of explosion-proof motor, explain for everybody below motor of explosive-proof grade represents meaning.
Motors explosion-proof grade according to the working condition of categories, respectively for mine and mine factory two kinds big. Outside the mine explosion-proof motor and can be divided into: Exd Ⅱ AT4 and Exd Ⅱ BT4, Exd Ⅱ CT4. Exd Ⅱ AT4 level due to the low level of explosion-proof explosion-proof electric motor has been eliminated, the current domestic have not explosion-proof motor manufacturers. Although Exd Ⅱ CT4 explosion-proof level is higher, but the price a lot more expensive, only used on special occasions. Therefore, the most commonly used for Exd Ⅱ BT4 explosion-proof motor.
Then, someone asks, Exd Ⅱ BT4 what's the meaning?
1. Represents the Ex explosion-proof motor signs;
The structure of 2 d on behalf of explosion-proof motor, namely the meaning of "flameproof";
3. Ⅱ represents the category of the explosion-proof electric motor, namely the meaning of "factory with";
4. On behalf of explosion-proof motors explosion-proof grade B to B;
5. T4 represent temperature classes, namely the maximum surface temperature is less than 135 degrees Celsius.