Regarding the Ex explosion-proof certification classification, it actually refers to the categorization of explosion-proof electrical equipment based on different usage locations, mainly including Class I, Class II, and Class III explosion-proof certifications.

Type I explosion-proof certificate is a certification for underground coal mine equipment, usually used in conjunction with the coal safety certificate of the equipment.

Class II explosion-proof certification is applicable to explosion-proof equipment used in non-mining explosive gas environments, such as equipment used in petrochemicals, gas, oil depots, and similar locations.

Class III explosion-proof certification is applicable to explosion-proof equipment used in non-mining explosive dust environments, such as equipment used in painting, sanding, feed, food, and other similar locations.

Additionally, qualified explosion-proof certification bodies in China include Tianjin PCEC, Nanyang CNEX, Shanghai NEPSI, Shanghai Coal Research Institute, Changsha Mining Institute, Suzhou Electric Research Institute, and CQC. These organizations conduct testing and certification based on the explosion-proof certification standards such as GB/T 3836 series.

On explosion-proof equipment, there is usually a marking, such as "Ex db ib IIC T4 Gb." "Ex" indicates explosion-proof, "db ib" refers to the type of explosion-proof protection adopted by the equipment, "IIC" signifies the equipment is suitable for explosive gas environments of IIC class gases, "T4" is the temperature group, and "Gb" denotes the protection level of the equipment.

This information can help you better understand the explosion-proof certification levels of Ex. If you have any other needs or questions regarding explosion-proof certification, please feel free to consult Shenzhen ZhongNuo Testing Technology Co., Ltd.!