Shenzhen ZhongNuo 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.
What are common misconceptions about explosion-proof certification?
1. The explosion-proof grade is not the higher, the better.
The explosion-proof grade is related to the product structure and installation/use location. Choose the appropriate one. Of course, as long as the product structure meets the requirements, the higher the explosion-proof grade, the wider the applicable range.
2. Explosion-proof rating does not equal protection class.
The protection rating, commonly referred to as IP rating, is different from the explosion-proof rating.
3. The lower the temperature combination, the safer it is, rather than the higher the better.
Temperature combinations T6 (85°C), T5 (100°C), T4 (135°C), T3 (200°C), T2 (300°C), T1 (450°C) indicate the high surface temperatures achieved by the equipment under adverse conditions. In explosive hazardous areas, of course, the lower the high surface temperature of the equipment, the safer it is.
4. The explosion-proof certificate for gases cannot be used in dust areas, and conversely, the dust explosion-proof certificate cannot be used in gas areas.
5. It can also be used for a explosion-proof certification in coal mine underground.
Wrong. Electrical equipment for underground coal mines requires coal safety certification, and the frequent agency is the Safety Standardization Center.
Explosion-proof certification applies only to locations where explosive gases and dust are present underground in non-coal mines. If the product is listed in the explosion-proof CCC catalog, it is required to undergo explosion-proof 3C certification.

What are common misconceptions about applying for explosion-proof certification for products?
The explosion-proof grade is not the higher, the better.
In relation to the explosion-proof grade, product structure, installation method, and usage location, choose the appropriate one. Of course, as long as the product structure meets the requirements, the higher the explosion-proof grade, the wider the applicable range.
2. Explosion-proof ratings are not the same as protection ratings.
The protection grade is what we commonly refer to as the IP rating, which is different from the explosion-proof grade.
3. Temperature categories are not the higher, the better; instead, the lower, the safer.
The temperature group indicates the high surface temperature achieved by the equipment under adverse conditions. In explosive hazardous areas, of course, the lower the high surface temperature of the equipment, the safer it is.
4. The gas explosion-proof certificate cannot be used in dust areas, and conversely, the dust explosion-proof certificate cannot be used in gas areas.
5. Explosion-proof is safer than intrinsic safety. Many clients believe that having an explosion-proof shell offers more safety than intrinsic safety, which is incorrect. They are different types of explosion-proofing, both can achieve explosion-proofing, and if suitable for the product structure and environment, they are safe.
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What documentation is required to apply for an explosion-proof certification?
1. Product Drawings and Documents: When applying for a防爆 certification for intrinsically safe electrical equipment, the applicant should provide assembly drawings, circuit diagrams, printed circuit board layouts, silk-screening diagrams, material lists for components, and label drawings, among others. For non-intrinsically safe electrical equipment, the technical documents submitted for inspection should include drawings that reflect the sample's explosion-proof performance (including assembly drawings and component drawings). If the assembly drawing clearly indicates the product's explosion-proof parameters and structure, the assembly drawing alone may be submitted for inspection.
2. Technical Documents: Include corporate standards/technical requirements. The corporate standards/technical requirements for the product should be written in the specified format, with content that includes not only performance requirements of the product but also related防爆 aspects: such as basic parameters, explosion-proof markings, operating environmental conditions, explosion-proof performance requirements, relevant tests for explosion-proof performance, and markings related to explosion-proof.
3. Additional Information: For products with adhesive bonding or casting, provide the model names, performance descriptions, and relevant process documents for the adhesives and casting agents. For plastic shell products, supply the material type and corresponding performance documents. Battery-equipped products require a battery specification sheet.

Why choose tempered glass for explosion-proof transparent parts?
Transparent parts are a critical material for explosion-proof electrical equipment. When selecting transparent parts, customers always ask what material should be used? Can glass be used? Can plastic be used?
Below, Shenzhen Zhongnuo Testing Technology Co., Ltd. explains to you.
There is a clear specification in GB/T3836.1 for thermal shock tests on transparent components, which is designed to verify the thermal stability of glass under rapid cooling conditions. Currently, tempered glass is a material that meets these requirements and offers high cost-performance.
普及 the fact that tempered glass, after being heated and quenched, forms an even layer on the surface
The compressed stress layer counteracts the tensile stress generated on the surface during rapid cooling, thus, qualified tempered glass, even when subjected to stresses from rapid cooling, will have a compressive stress to offset its effects.
Explosion-proof Certification Application Consulting Service - Shenzhen Zhongnuo Testing Technology Co., Ltd.