Regarding explosion-proof classification standards, Shenzhen Zhongnuo Testing Technology Co., Ltd. can provide you with the following information:

Explosion-proof electrical equipment is mainly categorized into Class I, Class II, and Class III explosion-proof certifications based on different usage locations:

(1) Class I explosion-proof certificate: This is a certification for underground coal mine equipment. It is generally used in conjunction with the coal safety certificate of the equipment, indicating that the equipment can operate safely in the coal mine gas environment.

(2) Class II explosion-proof certificate: This certification is applicable to explosion-proof equipment used in non-mining environments with flammable and explosive gases. For example, equipment used in places such as petrochemicals, gas, and oil depots, which are prone to flammability and explosion, must obtain a Class II explosion-proof certificate.

(3) Class III Explosion-Proof Certificate: This is a certification for explosion-proof equipment used in non-mining environments with flammable and explosive dust. For example, equipment used in paint spraying, sanding, feed, food, and other flammable and explosive areas requires a Class III Explosion-Proof Certificate.

Additionally, each letter of the explosion-proof marking has a specific meaning. For example:

a. Ex: This indicates the symbol for electrical equipment used in gas environments.

b. ib: Indicates the protective type is intrinsically safe.

c. I: Indicates the coal mine gas environment.

d. IIC: Indicates that the equipment is suitable for IIC-level gas and vapor environments.

e. T6: Indicates the temperature group is T6, meaning the highest surface temperature of the equipment does not exceed 85°C.

When obtaining explosion-proof certification, there are a few points to note:

(1) The explosion-proof grade is not the higher, the better; instead, it should be selected based on factors such as product structure, installation method, and usage location.

(2) Explosion-proof rating is not the same as protection rating (IP rating); they are different concepts.

(3) The lower the temperature category, the higher the equipment's safety.

(4) The explosion-proof certificate for gases is not applicable to dust areas, and similarly, the dust explosion-proof certificate is not to be used in gas environments.

For more detailed explosion-proof certification information or technical support, please feel free to contact Shenzhen ZhongNuo Testing Technology Co., Ltd.