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Explosion-Proof T4 Temperature

T4 is one of the temperature classifications. The most optimal is T6, while T1 is the least desirable.

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

Specifically, Group T4 is categorized by having a maximum surface temperature of ≤135°C.

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