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Explosion proof grades BT4 and CT4
The main differences between explosion-proof levels BT4 and CT4 are reflected in their explosion-proof capabilities, applicable gases, and protection levels，If the work environment involves high-risk gases such as acetylene and hydrogen, or requires a high level of protection, CT4 should be selected; If only conventional gases such as methane and ethane are processed and the temperature requirements are low, BT4 can be used.
Explosion proof grades BT4 and CT4
The main differences between explosion-proof levels BT4 and CT4 are reflected in their explosion-proof capabilities, applicable gases, and protection levels, as follows:
1、 Explosion proof rating and protection capability
CT4: The explosion-proof level is ExdIICT4, where C represents factory explosion-proof, T4 represents maximum surface temperature ≤ 135 ℃, and the overall protection level is higher, suitable for more complex and dangerous environments.
BT4: Explosion proof level is ExdIIBT4, with a protection level lower than CT4, suitable for general factory environments, but not suitable for high temperature or special gas scenarios.
2、 Applicable gas environment
CT4: Specially designed for flammable and explosive gases such as acetylene and hydrogen, it can cover sub grades such as CT1 (hydrogen) and CT2 (acetylene), and is suitable for high-risk gas environments.
BT4: Suitable for common flammable gases such as methane, ethane, hydrogen sulfide, as well as Class IIB gases (such as ethylene), but not suitable for special gases such as acetylene.
3、 Applicable area
CT4: Can cover gas hazardous areas Zone 1 and Zone 2, suitable for high temperature or complex gas environments.
BT4: Usually used in Zone 2 of gas hazardous areas, with low temperature requirements (≤ 135 ℃).
4、 Temperature group
Both use T4 temperature group (maximum surface temperature ≤ 135 ℃), but CT4 has a higher protection level and is compatible with more demanding industrial scenarios.
Summary: If the work environment involves high-risk gases such as acetylene and hydrogen, or requires a high level of protection, CT4 should be selected; If only conventional gases such as methane and ethane are processed and the temperature requirements are low, BT4 can be used.
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