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The explosion-proof mark generally consists of the following 5 parts:
1 Explosion-proof mark EX—indicates that the equipment is explosion-proof electrical equipment;
2 Explosion-proof level - divided into A, B, C three levels, indicating the strength of its explosion-proof ability;
3 Temperature group - divided into six groups T1~T6, indicating the maximum allowable surface temperature of the equipment.
4 Explosion-proof structure form—indicates which measures the equipment adopts for explosion-proof, such as d is explosion-proof type, p is positive pressure type; i is intrinsically safe, etc.;
5 Category of explosion-proof equipment - divided into two categories, I is the electrical equipment used in coal mines, and II is the electrical equipment used in factories;
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