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TheDifferenceBetweenExplosion-ProofLevelBT6andBT4|TechnicalSpecifications

Technical Specifications

The Difference Between Explosion-Proof Level BT6 and BT4

The ‘B’ classification denotes the approved level of equipment for handling gases and vapors within a facility, typically used for substances like ethylene, dimethyl ether, and coke oven gas.

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

The ‘T’ category specifies temperature groups, where T4 equipment has a maximum surface temperature of 135°C, and T6 equipment maintains a maximum surface temperature of 85°C.

Since T6 equipment operates at a lower surface temperature compared to T4, it reduces the likelihood of igniting explosive gases. Consequently, BT6 is superior to BT4.

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