Shenhai Explosion-Proof
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 equipment | Maximum allowable surface temperature of electrical equipment (℃) | Gas/vapor ignition temperature (℃) | Applicable device temperature levels |
|---|---|---|---|
| T1 | 450 | ＞450 | T1~T6 |
| T2 | 300 | ＞300 | T2~T6 |
| T3 | 200 | ＞200 | T3~T6 |
| T4 | 135 | ＞135 | T4~T6 |
| T5 | 100 | ＞100 | T5~T6 |
| T6 | 85 | ＞85 | T6 |
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.