23 Year Industrial Explosion-Proof Manufacturer

Explosion-Proof Level BT2 and BT4

The explosion-proof classification dⅱ bt4 for electrical equipment surpasses dⅱ bt2, differing only in the classification numbers 4 and 2.

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

Classification T4 specifies that the gas ignition temperature is under 135°C, whereas T2 allows for temperatures up to 300°C.

Ignition temperatures are divided into six categories, ranging from T1 to T6, with each higher category being suitable for the conditions of all preceding categories.

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