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 one-stop explosion-proof technology consulting services.
Is the explosion-proof grade Ex db eb higher than Ex db?
Composite explosion-proof marking indicates that a single explosion-proof type is insufficient for this product's explosion-proof requirements; it must utilize two or more explosion-proof types.
For example, explosion-proof equipment with antennas, where the antenna section is typically intrinsically safe, making this device both explosion-proof and intrinsically safe.
Additionally, the nozzle part of the oiler typically belongs to Zone 0, which can only be made into intrinsic safety ia. Other parts can be made into Zone 1, suitable for intrinsic safety ib, or explosion-proof types.
Composite explosion-proof products do not mean that the product must meet all the requirements of different explosion-proof types simultaneously, nor does it mean that the explosion-proof grade of a composite explosion-proof type is necessarily higher than that of a single explosion-proof type.
The primary factor in determining the explosion-proof level of a product is the gas/dust combination, temperature class, and equipment protection level.
Gas Mix: II-C > II-B > II-A
Dust Composition: III-C > III-B > III-A
Temperature Categories: T6 > T5 > T4 > T3 > T2 > T1
Equipment Protection Combination: Ga > Gb > Gc, Da > Db > Dc
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What do the 0, 1, and 2 zones in explosion-proof certification mean?
This is the classification of explosion-proof zones in explosive gas environments, divided into Zone 0, Zone 1, and Zone 2.
Zone 0: Locations where explosive gas mixtures are continuously present or exist for long periods (over 1000 hours per year).
Zone 1: Areas where explosive gas mixtures may normally be present.
Zone 2: Under normal circumstances, explosive gas mixtures are unlikely to occur, only in places with short-term abnormal presence (less than 10h/year).
Classification of explosion-proof areas for explosive dust environments, divided into Zones 20, 21, and 22.

What are common misconceptions about applying for explosion-proof certification for products?
Explosion-proof ratings are not the higher, the better.
In防爆ratings are related to product structure, installation methods, and usage locations; choose the appropriate one. Of course, as long as the product structure meets the requirements, the higher the explosion-proof rating, the wider the range of applications.
2. Explosion-proof rating is not equivalent to protection rating.
The protection rating, commonly referred to as the IP rating, is different from the explosion-proof rating.
3. The lower the temperature range, the safer it is, rather than the higher the better.
Temperature categories represent the high surface temperature reached 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 environments, and conversely, the dust explosion-proof certificate cannot be used in gas environments.
5. Explosion-proof is safer than intrinsic safety. Many clients believe that having an explosion-proof enclosure provides greater safety than intrinsic safety, but this is incorrect. They are different types of explosion-proofing, all of which can achieve explosion prevention. A product structure and environment that are suitable for the type of explosion-proofing are safe.
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What explosion-proof certifications are required for explosion-proof products? What consulting agencies are available for explosion-proof certification applications?
Currently, the certification models for explosion-proof products entering the Chinese market mainly consist of three types.
1. Issue explosion-proof certificates for equipment used in environments with explosive gases and combustible dust in non-coal mines. Simply conduct product testing; upon passing the test, the certificate is issued.
2. Conduct explosion-proof 3C certification; for products listed under the explosion-proof 3C category, product testing and factory audits are required.
3. Coal Mine Safety Certification, for explosion-proof equipment used underground in coal mines, including product testing and factory audit certification.
ZhongNuo Inspection offers explosion-proof certification application consulting services, providing a one-stop solution for explosion-proof certification and coal safety certification, including product design, rectification, drawing assessment, certification acquisition, and factory audit. We are well-versed in certification standards and procedures, with extensive case studies and experience. Feel free to send us a private message!
Explosion-proof Certification Application Consulting Service - Shenzhen Zhongnuo Testing Technology Co., Ltd.