The Class I explosion-proof certificate we refer to is a certification certificate used for underground equipment in coal mines, usually used in conjunction with the coal safety certificate of the equipment.

The Class II explosion-proof certificate refers to the certification certificate for explosion-proof equipment used in non mining explosive gas environments. For example, equipment is used in places such as petrochemical, gas, and oil depots.

The Class III explosion-proof certificate refers to the certification certificate for explosion-proof equipment used in non mining explosive dust environments. For example, equipment is used in places such as spray painting, polishing, feed, and food.

From this, it can be seen that Class I, Class II, and Class IIIExplosion proof certificateThe main difference is the location of use of the equipment.

Qualified explosion-proof certification institutions in China include Tianjin PCEC, Nanyang CNex, Shanghai NEPSI, Shanghai Coal Science Institute, Changsha Mining Institute, Suzhou Electric Power Research Institute, Guangzhou Special Inspection Institute, etc.

At present, the domestic explosion-proof certification standards are mainly based on the GB3836 series. The original GB12476 (dust) and GB25286 (non electrical) series standards have also been merged into GB3836.

Enterprise's application for testing in ZhongnuoExplosion proof certificationThe main drawing materials provided include schematic diagrams, final assembly drawings, structural diagrams, enterprise standards, manuals, etc. Generally, 1-2 samples are provided.