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WhichExplosion-ProofLevelIsHigher,BT4orBT6|TechnicalSpecifications

Technical Specifications

Which Explosion-Proof Level Is Higher, BT4 or BT6

According to national standards for electrical explosion protection, both BT4 and BT6 fall under Class IIB.

Temperature group of electrical equipmentMaximum allowable surface temperature of electrical equipment (℃)Gas/vapor ignition temperature (℃)Applicable device temperature levels
T1450>450T1~T6
T2300>300T2~T6
T3200>200T3~T6
T4135>135T4~T6
T5100>100T5~T6
T685>85T6

However, the ‘T’ classification pertains to the temperature rating of explosion-proof electrical devices. Devices classified as T6 must maintain a surface temperature no higher than 85°C, T5 must not exceed 100°C, and T4 must not surpass 135°C.

The lower a device’s maximum surface temperature, the less likely it is to ignite atmospheric gases, thereby enhancing safety. Consequently, the explosion-proof rating of BT6 exceeds that of BT4.

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