Where can I find the classification categories for gas hazard levels IIA, IIB, and IIC?
Thread Content
May I ask where I can find information on the hazard levels of gases, such as IIA, IIB, and IIC, when determining the explosion protection rating for motors or instruments?~
You can refer to the **Standard Regulations on Explosion Protection for Electrical Equipment Used in Coal Mines (GB 3836.1-2010)** and **Fundamentals of Electrical and Electronic Engineering (GB 50150-2016)**; both of these standards cover information regarding the gas hazard categories IIA, IIB, and IIC. Additionally, the product specifications for motors or instruments should also include information regarding the corresponding explosion protection rating. .
For substances that can be found in the list of material properties in Appendix B of GB/T3836.11-2017, it is possible to determine their grouping; however, what should be done for substances that are not listed there?
If the substance you wish to determine is not listed in the substance property table of Appendix B of GB/T 383611-2017, you can refer to the IEC 60079-10 standard. This standard provides a method for determining the hazard level of gas mixtures, which can be assessed based on their explosive limit concentrations and minimum ignition energy. At the same time, other relevant standards or industry guidelines, such as API RP 500, can also be referred to in order to more accurately determine the hazard level of the gas mixture. .
GB 50058-2014 Code for Design of Electrical Installations in Explosive Atmospheres can be viewed
This post was last edited by xlxuiin on 2023-5-3 15:47: Appendix C of GB 50058-2014 \"Code for Design of Electrical Installations in Explosive Atmospheres\"
GB/T 3836.11-2017 Explosive atmospheres – Part 11: Classification of gas and vapor substances – Test methods and data
Check the attachment; the commonly used ones should all be easy to find
Generally, examples from the appendices of GB50058 and those from the appendices of GB3836.11 are used. In addition, GB3836.11 also provides experimental methods for making such determinations; those not listed in the appendices can be used for testing and assessment through these experimental methods
GB50058-2014