Shenzhen ZhongNuo Inspection & Testing Technology Co., Ltd. is based in South China and specializes in explosion-proof certification and coal safety certification application consulting services, offering a one-stop explosion-proof technology consulting service.
Basic Knowledge of Explosion-proof Certification Grades
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 document for underground coal mine equipment. It is typically 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 petrochemical, gas, and oil storage facilities, 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 places like painting, sanding, feed, and food processing, which are prone to flammability and explosion, requires a Class III explosion-proof certificate.
Additionally, each letter in the explosion-proof symbol has a specific meaning. For example:
a. Ex: Indicates this is a marking for electrical equipment used in gas environments.
b. IB: Indicates the protective type is intrinsically safe.
c. I: Represents 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 equipment's high surface temperature does not exceed 85°C.
When obtaining explosion-proof certification, there are several points to note:
Explosion-proof ratings are not the higher, the better; rather, the appropriate rating should be chosen 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 cannot be used in dust areas. Similarly, the dust explosion-proof certificate cannot be used in gas areas.
For more detailed explosion-proof certification information or technical support, please feel free to contact Shenzhen ZhongNuo Testing Technology Co., Ltd.

What explosion-proof certificates are required for explosion-proof electrical equipment?
In China, explosion-proof equipment requires explosion-proof certificates, primarily including the Explosion-Proof Certificate, Explosion-Proof 3C Certificate, and Coal Safety Certification.
(1) For products listed in the Explosion-Proof 3C Catalog, such as motors, fans, intercoms, etc., a Explosion-Proof 3C certification is required. This certification process involves "product testing + factory audit," and the applicant must have a manufacturing facility or an OEM/ODM factory.
(2) For explosion-proof products not listed in the 3C certification catalog, used in non-mining flammable and explosive sites, only a certificate of explosion-proof compliance is required.
(3) For use in coal mines with flammable and explosive mixtures like gas, a Coal Safety Certification must be obtained.
Whole machine explosion-proof certification has different categories and applicable locations, such as intrinsic safety type, flameproof type, and encapsulation type, based on the explosion-proof type; categorized by application, it includes gas explosion-proof certification, dust explosion-proof certification, and mine explosion-proof certification; and in terms of applicable areas, there are domestic explosion-proof certifications, ATEX certifications, and IECEx certifications, etc.
For more information on explosion-proof equipment qualifications, please contact Shenzhen ZhongNuo Testing Technology Co., Ltd. at any time.

The process of obtaining explosion-proof certification for a product involves considering the specific conditions of its use site, such as whether it's a gas or dust environment, the types of explosive materials involved, and the explosion-proof zone where the equipment is installed, to determine the appropriate explosion-proof markings for the product. This is significant for our explosion-proof design work.

Is ATEX certification the same as explosion-proof certification? What are the differences between them?
Explosion-proof certification refers to a safety certification for equipment and products used in explosive hazardous areas.
To meet the requirements of explosion-proof certification standards, certain measures must be taken, which we refer to as explosion-proof protection types.
Common explosion-proof protection types include intrinsic safety, flameproof, positive pressure, and increased safety, etc.
Clearly, intrinsic safety is just one type of explosion-proof protection.
Different explosion-proof protection types have varying design requirements for the product.
Intrinsically safe is a type of explosion-proof protection that limits electrical energy, ensuring that even in the event of a fault, the energy produced is not sufficient to ignite the surrounding explosive environment.
Therefore, intrinsic safety requirements limit the current, voltage, capacitance, inductance, etc., of electrical equipment, and are generally suitable for low-power devices.
Additionally, specific requirements are in place for the power supply method of intrinsically safe equipment, the material of the housing, and wireless transmission.
As a long-term specialized third-party consulting agency in the explosion-proof certification field, ZheNuo Inspection has dedicated engineers in intrinsically safe circuit and structural design. We offer technical consulting services for explosion-proof circuit design, drafting, and rectification. We have extensive experience in designing and obtaining certifications for intrinsically safe IA, IB, and IC classifications.
If you require certifications in this area, feel free to send us a private message!
Explosion-proof Certification Application Consulting Service - Shenzhen Zhongnuo Testing Technology Co., Ltd.