The Ex d IIC T4 marking is utilized as a standard identification for explosion-proof electrical equipment. The core parameters are summarized in the following table:
| Marking Code | Core Definition |
|---|---|
| Ex | Certified explosion-proof equipment |
| d | Flameproof enclosure protection type |
| IIC | Severe explosive gas group |
| T4 | Maximum surface temperature limit (135°C) |
Detailed Parameter Breakdown
- Ex: It is indicated that the equipment is an explosion-proof type. Explosion-proof certification has been successfully passed, and the device is permitted for use in flammable and explosive environments.
- d: The protection method is designated as a “flameproof enclosure.” It is ensured by this structural design that internal explosions can be withstood by the enclosure without damage, and the propagation of flames and explosive byproducts to the external environment is effectively prevented.
- IIC: The explosion-proof rating for explosive gas environments is represented. (Note: While basic classification levels exist in industrial standards, the IIC grade is specifically applied to the most severe explosive gas environments).
- T4: The maximum surface temperature class of the equipment is defined as T4. It is strictly guaranteed that under normal operating conditions, the equipment’s surface temperature will not be elevated beyond the T4 limit (typically 135°C), so that surrounding explosive atmospheres are prevented from being ignited.
In summary, Ex d IIC T4 explosion-proof electrical equipment is deployed in environments characterized by explosive gases and strict safety requirements. Production demands can be securely met while operational safety is comprehensively guaranteed.
