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The order of explosion-proof ratings is straightforwardly recorded as A < B < C. [table id=280 /] For the 'T' rating, it's remembered by its numerical order: the larger the number, the higher and safer the rating. Therefore, an explosion-proof rating of BT4 surpasses that of AT2. It's important to…

Classes A and C denote locations where hazardous materials are stored, with a higher explosion-proof rating of CT. [table id=108 /] In China, Class A typically includes sites containing propane, whereas Class C encompasses areas with gases like hydrogen and acetylene.

In both gas and temperature categories, BT4 exceeds AT3, therefore providing a higher explosion-proof rating. [table id=280 /] Class A includes gases such as ethane, methanol, ethanol, and gasoline; Class B comprises gases like residential gas, ethylene, and ethylene oxide. The T3 temperature classification applies to environments up to 200°C…

In the realm of explosion-proof electrical certification, the "T" category designates temperature groups, where T1 signifies that the device's maximum surface temperature remains below 450°C. [table id=280 /] Predominantly, explosion-proof electrical equipment is classified into temperature groups T4, T5, and T6. T3 classifications exist but are relatively rare.

The IIB explosion-proof classification inherently exceeds IIA, and the T4 temperature class provides lower and safer temperatures than T1. Thus, BT4 has a superior explosion-proof rating. [table id=280 /] Each explosion-proof class targets specific safety goals. Detailed information can be found by searching on Shenhai Explosion Proof.