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 standards are used for explosion-proof certification? What technical requirements are there?
Explosion-proof is a type of explosion prevention for electrical equipment.
Its housing is designed to withstand explosive mixtures entering the housing through the housing joint surfaces or structural gaps, and to withstand internal explosions without being damaged.
And ignite an explosive gas atmosphere formed by one, several gases or vapors.
Explosion-proof casings must possess both explosion-proof and explosion-resistant properties. Generally, the casings of explosion-proof products are rather bulky and are suitable for products and equipment that are intended for fixed installations and use.
Explosion-proof junction face width, gap, and roughness are the three key elements of explosion-proof housing design.
Design requirements for explosion-proof three elements vary depending on the different explosive gas environments used in Class I mining, non-mining Class IIA, IIB, and IIC.
Refer to the design standards of GB/T3836.1 and GB/T3836.2 for specifics.
ZhongNuo Inspection has long been dedicated to the design, testing, and certification of explosion-proof products.
Our team in the explosion-proof field is well-versed in explosion-proof standard requirements.
We offer explosion-proof housing design, illustration, modification guidance, certification agency services.
If you have a similar need, feel free to DM Shenzhen ZhongNuo Testing Technology Co., Ltd. anytime!

Division of Explosion-Proof Zones in Combustible Dust Environments -- Shenzhen ZhongNuo Inspection Technology Co., Ltd.
Explosive atmospheres are classified according to the physical state of substances present at the site, with hazardous areas being divided into explosive gas environments and combustible dust environments. Based on the duration of the presence of hazardous substances at the site, hazardous areas under the two different physical states are further divided into three zones.
For combustible dust environments, it is designated as 20, 21, and 22 zones.
Areas in Zone 20 where flammable dust environments occur continuously or persist for extended periods, typically over 1000 hours per year.
Zone 21 - Areas where potentially explosive dust atmospheres may occur during normal operation, typically 10-1000h/year
Zone 22 - Under normal operation, it is impossible to have an environment with combustible dust or a place that occasionally exists for a short period; generally below 10h/y.

What is the difference between ATEX certification and CE certification?
CE certification is a mandatory certification in the EU market, and all equipment and products entering the EU market must pass the relevant CE directive certification.
For example, there are EMC directives, LVD directives, MD directives, ATEX directives, etc.
Different products are subject to different certification directives; the ATEX directive specifically pertains to explosion-proof equipment and products.
ATEX certification can be likened to the CE certification for explosion-proof products.
Each directive has different applicable standards; for the ATEX directive, the applicable standard is the EN60079 series.
Different explosion-proof types are applicable to different standard series.
For example, EN 60079.1 is the standard for explosion-proof, EN 60079.7 is the standard for increased safety, and EN 60079.11 is the standard for intrinsic safety, etc.
Learn more about ATEX certification, and feel free to private message Shenzhen Zhongnu Inspection Technology Co., Ltd. for more information!

What's the difference between the corrosion protection grade, protection grade, and explosion-proof certification grade?
Many corporate clients are often baffled by the required corrosion, protection, and explosion-proof certification levels for their products.
Due to the single-character difference in names, both referring to the grade of a product's aspect, they are similar yet distinct.
What are the differences between them?
Corrosion prevention involves implementing measures to protect metal items prone to rust, thereby extending their service life. This is typically achieved through methods such as physical, chemical, and electrochemical corrosion prevention. Common classifications include indoor F1, F2, and outdoor WF, WF1, and WF2, totaling five levels.
Protection grade, commonly known as 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 mark, including the explosion-proof type and grade. The explosion-proof grade indicates the product's applicable explosion-proof area, gas/dust group, temperature group, and equipment protection level, etc.
Clearly, these three concepts belong to different fields and are distinct from each other.
For more information on this topic, feel free to DM Shenzhen ZhongNuo Inspection & Technology Co., Ltd. anytime!
Explosion-proof Certification Application Consultation Service - Shenzhen ZhongNuo Testing Technology Co., Ltd.