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Is Hydrogen Explosion-Proof Level CT1 or CT4

Typically, the explosion-proof classification for hydrogen zones is IIC grade. For T1 rated equipment, the highest surface temperature remains below 450°C. Given that hydrogen’s ignition temperature reaches 574°C, opting for T1 is adequate.

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

Being the lowest level in temperature classifications, any T-rating meets the criteria. Hence, in hydrogen explosion-proof ratings, both CT1 and CT4 are viable options, with CT1 equipment generally being more cost-effective.

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