Temperature classes on equipment are applicable to gases and indicate the max. acceptable surface temperature. When a site is classified as Zone 1 / IIA / T4 Hot surfaces become dangerous ≥ 135°C.
For that reason all Ex equipment shall be selected having a T class T4, T5 or T6. Remarks: The higher the T class, the lower the belonging acceptable temperature. (T6 classified sites are most dangerous, T6 certified equipment is most safe!)
| T Class | Surface Temperature |
| T1 | 450 °C |
| T2 | 300 °C |
| T3 | 200 °C |
| T4 | 135 °C |
| T5 | 100 °C |
| T6 | 85 °C |
Executive Summary:
This report provides a comprehensive examination of Temperature Classes (T1-T6) applied to electrical equipment, emphasizing their significance in ensuring safe operations in industrial settings. By understanding the characteristics, applications, and considerations associated with each Temperature Class, industries can make informed decisions regarding the selection, installation, and maintenance of electrical equipment.
1. Introduction:
Temperature Classes serve as a crucial classification system, defining the maximum surface temperature allowable for electrical equipment during regular operation. This classification is particularly pertinent in industries where the risk of ignition is heightened due to the presence of flammable gases, vapors, or dust. The Temperature Classes range from T1 (lowest maximum surface temperature) to T6 (highest maximum surface temperature).
2. Characteristics of Temperature Classes:
- T1: Maximum surface temperature not exceeding 450°C. Suited for areas with an extremely low risk of flammable materials.
- T2: Maximum surface temperature not exceeding 300°C. Applicable in environments where flammable substances are unlikely to be present in significant quantities.
- T3: Maximum surface temperature not exceeding 200°C. Suitable for areas with a moderate risk of flammable materials.
- T4: Maximum surface temperature not exceeding 135°C. Appropriate for environments where the risk of ignition is present but minimized.
- T5: Maximum surface temperature not exceeding 100°C. Designed for areas with a high risk of flammable substances.
- T6: Maximum surface temperature not exceeding 85°C. Suitable for environments with the highest risk of flammable materials.
3. Applications:
The selection of the appropriate Temperature Class hinges on the surrounding atmosphere and the potential presence of flammable substances. Common applications for each Temperature Class include laboratories and clean rooms for T1-T2, chemical processing plants and refineries for T3-T4, and oil and gas facilities for T5-T6.
4. Considerations:
- Environmental Conditions: Ambient temperature, humidity, and other environmental factors must be considered when determining the suitable Temperature Class.
- Equipment Design: Manufacturers must design equipment to meet Temperature Class requirements, ensuring that surface temperatures stay within defined limits.
- Regular Inspections: Periodic inspections and maintenance are vital to ensure ongoing compliance with Temperature Class specifications.
5. Compliance and Regulations:
Adherence to international standards such as IEC and ATEX is critical for complying with safety regulations related to electrical equipment in hazardous environments.
6. Conclusion:
Temperature Classes T1-T6 play a pivotal role in maintaining safety standards in environments with an elevated risk of ignition. Proper selection, installation, and maintenance of electrical equipment in alignment with Temperature Classes are essential for preventing accidents and ensuring the safety of personnel and assets.
7. Recommendations:
Industries are advised to conduct thorough risk assessments and consult relevant safety standards to determine the appropriate Temperature Class for their specific applications. Regular training and awareness programs should be implemented to educate personnel on adhering to Temperature Class specifications for electrical equipment. For expert guidance on explosion-proof needs, consider reaching out to Shikamaru Tech, specializing in reliable solutions for hazardous environments. This report serves as a valuable guide to understanding Temperature Classes and underscores their critical role in promoting a safe working environment in industries prone to explosions or fires.