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What is it called explosion proof certification?
Explosion-proof certification is used to determine the equipment in line with the requirements of explosion-proof standards, type test and adaptation of the routine test and issue the relevant certificate of competency. The explosion-proof certificate can be used for Ex devices or Ex components.
Explosion-proof certification of the enterprise requirements: apply for product certification enterprises need to apply through the ISO9000 series certification.
Since the 21st century, with the rapid development of China's oil, chemical industry, mining and other industries, lighting lamps in the production, storage, rescue the use of more and more widely, more and more varieties. It is particularly important to prevent the occurrence of accidental explosions in explosive atmospheres in explosive atmospheres. So in the flammable and explosive environment through the use of national certification bodies certified explosion-proof lights more and more attention.
Explosion List of Explosion - proof Marks at Home and Abroad

1. Gas group

Note: China GB3836 standard IIC class minimum ignition energy of 19 micro joules, Ⅱ A class minimum ignition energy of 200 micro joules.
The gas grouping and ignition temperature are related to the concentration of combustible gases and air at a certain ambient temperature and pressure.
2. Temperature group (T group)
This is the highest surface temperature of the electrical equipment (assuming an ambient temperature of 40 ° C) associated with the gas ignition temperature, irrespective of the ignition temperature. All flammable gases and their groups are listed in the first part of the standard BS5345.

3. Examples of explosion-proof equipment signs
3.1 If the electrical equipment for the Class IIB flameproof T3 group, marked as Exd Ⅱ BT3.
3.2 such as electrical equipment for the class Ⅱ increase safety type, the temperature group T2 group, marked as Exe Ⅱ T2.
3.3 If the electrical equipment using more than one compound type, then the main proof of the main explosion-proof type, after the other explosion-proof type marked, such as the main use of security-type built-in class IIC explosion-proof parts, temperature group T4, marked Exed Ⅱ CT4.
3.4 Electrical equipment for flammable dust atmospheres - see GB12476.1-2000 Electrical equipment for combustible dust atmospheres - Part 1: Electrical equipment for enclosure and restricted surface temperature protection - Section 1: Technical requirements for electrical equipment For example.
3.5 below to CENELEC hydrogen explosion-proof signs as an example: EExia Ⅱ CT4

4. Classification, classification, and grouping of explosive gas mixtures
The following is the classification of the explosive gas classification, classification, group example table