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What is the difference between explosion-proof levels CT4 and BT4?

2 Answers

AthenaLee

07/30/25 2:11am

The differences between explosion-proof levels CT4 and BT4 are as follows: 1. Different levels: The explosion-proof level of CT4 explosion-proof motors is ExdIICT4, while that of BT4 explosion-proof motors is ExdIIBT4, with a lower protection level than CT4 explosion-proof motors. 2. Different applicable gas environments: BT4 is suitable for some conventional gases, such as methane, ethane, petroleum, hydrogen sulfide, and other common gases. CT4 can cover more uncommon and highly explosive gases, such as hydrogen at CT1 level, water gas, acetylene at CT2 level, and carbon disulfide at CT4 level. 3. Different explosion-proof levels: The explosion-proof level of CT4 explosion-proof motors is higher than that of BT4 explosion-proof motors. 4. Different applicable zones: BT4 is suitable for gas hazardous area Zone 2, with a maximum surface temperature not exceeding 135°C. CT4 is suitable for gas hazardous areas Zone 1 and Zone 2, with a maximum surface temperature not exceeding 135°C.

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Hailey

08/15/25 8:13am

When discussing explosion-proof ratings CT4 and BT4, as someone who frequently deals with industrial equipment, I believe the core difference lies in gas adaptability. BT4 refers to Group IIB gas scenarios, such as ethylene or propane environments, with a temperature class T4 (up to 135°C). CT4, on the other hand, is Group IIC level, designed for more sensitive and explosive gases like hydrogen or acetylene, also with temperature class T4. Simply put, Group IIC gases are more easily ignited than Group IIB, requiring higher equipment protection standards. If misused, equipment in flammable environments may overheat and cause explosions. For example, using BT4 equipment in IIC zones in chemical plants significantly increases accident risks, so selection must comply with the GB 3836 standard to test gas types. I recommend confirming environmental data with manufacturers before procurement to avoid safety hazards. Safety first—equipment maintenance should also include regular inspections.

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