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Explosion-proof designation exdllct4:
| Temperature level IEC/EN/GB3836 | The high surface temperature T of the device [℃] | Igniting temperature of combustible substances [℃] | Combustible substances |
|---|---|---|---|
| T1 | 450 | T>450 | 46 types of hydrogen, acrylonitrile, เป็นต้น |
| T2 | 300 | 450≥T>300 | 47 types of acetylene, ethylene, เป็นต้น |
| T3 | 200 | 300≥T>200 | 36 types of gasoline, butyraldehyde, เป็นต้น |
| T4 | 135 | 200≥T>135 | |
| T5 | 100 | 135≥T>100 | Carbon disulfide |
| T6 | 85 | 100≥T>85 | Ethyl nitrate |
Ex signifies explosion-proof;
d represents a flameproof type;
IIC indicates a safety gap smaller than 0.5 mm and a current below 0.45A;
T4 designates the temperature classification for explosion-proof electrical equipment, specifying that the surface temperature of the explosion-proof equipment must not exceed 135°C.