Shenzhen Zhongnuo Testing Technology Co., Ltd. specializes in consulting services for explosion-proof certification and coal safety certification.
What's the difference between corrosion protection grade, protection grade, and explosion-proof certification grade?
Many corporate clients are often confused about the required corrosion, protection, and explosion-proof certification levels for their products.
Due to the products being differentiated by only one character in their names, and both indicating a certain grade of the product, they are similar yet distinct. So, what are the differences between them?
Corrosion prevention involves taking measures to protect metal items prone to rust, with the aim of extending their service life. This is typically achieved through physical, chemical, and electrochemical corrosion prevention methods. Common grades include indoor F1, F2, and outdoor WF, WF1, and WF2, totaling five levels.
Protection rating, commonly known as the IP rating, refers to the dust and water resistance level of the equipment, usually consisting of "IP" followed by two digits.
The explosion-proof grade generally refers to the equipment's explosion-proof certification level. Each electrical equipment applying for an explosion-proof certification will have a corresponding explosion-proof marking, including the type and grade of explosion-proof. The explosion-proof grade indicates the product's applicable explosion-proof area, gas/dust group, temperature group, and equipment protection level, etc.
Clearly, these are different concepts from different fields. For more information, feel free to DM Shenzhen ZhongNuo Inspection & Technology Co., Ltd. anytime!

The domestic coal safety certification system is still relatively strict. It combines type testing with factory production system review.
To ensure that the applicant company is capable of ensuring the production and quality of the product. Even after obtaining the coal safety certification,
The company must undergo an annual supervision and evaluation by the Safety Standard Center.

What standards are used for explosion-proof certification? What are the technical requirements?
An explosion-proof type is a type of electrical equipment that can withstand the explosion of an explosive mixture entering the housing through the housing joint surfaces or structural gaps without damage, and prevent the ignition of an explosive gas environment formed by one or more gases or vapors outside.
The explosion-proof housing must possess both explosion-proof and anti-explosion properties. Generally, the outer casings for explosion-proof products are rather bulky, suitable for products and equipment designed for fixed installations and use.
Explosion-proof face width, gap, and roughness are the three key elements of explosion-proof housing design.
Design requirements for explosion-proof three elements vary according to different explosive gas environments in mining Class I, non-mining Classes IIA, IIB, and IIC. For specific details, refer to the design standards of GB/T3836.1 and GB/T3836.2.
Zhenuo Testing has long been dedicated to explosion-proof product design, testing, and certification services. We have a specialized team in the field of explosion-proofing, well-versed in the requirements of explosion-proof standards. We offer services such as explosion-proof housing design, drafting,整改 guidance, and certification agency services.
If you have a similar need, feel free to send a private message to Shenzhen ZhongNuo Inspection Technology Co., Ltd. anytime!

Basic Process of Coal Safety Certification and Application Consultation Agencies
Coal Mine Safety Certification is a mandatory safety certification for equipment and products used in underground coal mines, implemented through a "Product Testing + Factory Audit" approach.
We must conduct both product testing and on-site inspections of the manufacturing facilities for the products being applied for, along with annual supervision and evaluations, which is commonly referred to as factory audits.
The product testing aspect requires compliance with coal safety standards, such as electrical products needing to meet explosion-proof requirements in the coal mine gas environment, as well as performance requirements.
Factory audits primarily focus on the evaluation of the factory based on the ISO9001 production quality system, combined with the requirements of the Mine Products Safety Mark Implementation Rules. The Safety Mark Center is the issuing and inquiry institution for the Coal Safety Certification.
Shenzhen ZhongNuo Inspection offers coal safety and mine safety certification application consulting services, well-versed in the entire certification process and requirements. With a dedicated explosion-proof technology engineering team and factory audit specialists, we can facilitate enterprises in applying for coal safety certification conveniently and quickly.
Our successful cases include light boxes, remote controls, fiber optic temperature measurement devices, sensors, air compressors, mobile phones, thermal imaging cameras, and patrol robots, among others.
If you have any needs in this regard, feel free to DM us for further discussion at any time!
Coal Safety Certification and Mine Safety Certification Consultancy Services - Shenzhen Zhongnuo Testing Technology Co., Ltd.