Shenzhen Zhongnuo Testing Technology Co., Ltd. is headquartered in South China, specializing in explosion-proof certification and coal safety certification application consulting services, offering one-stop explosion-proof technology consulting services.
The explosion-proof grade is a classification used to indicate the safety performance level of equipment or environments in hazardous areas prone to flammable and explosive substances. It is primarily applied in industrial sectors such as oil, chemical, mining, and gas, where combustible gases, vapors, or dusts are present.
Selecting the explosion-proof grade requires comprehensive consideration of the type of hazardous environment, characteristics of explosive materials, equipment usage scenarios, and relevant standard requirements. When choosing the explosion-proof certification grade, the following points should be noted:
The choice of explosion-proof grade is not about the higher, the better, but should match factors such as product structure, installation method, and usage location. As long as the product structure meets the requirements, a higher explosion-proof grade chosen will have a wider applicability. However, please note that an overly high explosion-proof grade may increase product cost and complexity, so it should be selected based on actual needs.
Explosion-proof ratings and protection ratings (IP ratings) are different; they should not be confused. The protection rating mainly concerns the dust and water resistance of the equipment, while the explosion-proof rating focuses on the safety of the equipment in flammable and explosive environments.
Temperature group is also one of the factors to consider when selecting the explosion-proof grade. Temperature group indicates the high surface temperature of the equipment under adverse conditions. For flammable and explosive hazardous areas, the lower the high surface temperature of the equipment, the safer it is.
Explosion-proof and intrinsic safety are two distinct types of explosion protection, both capable of providing explosion prevention, with their own strengths and weaknesses. What suits the product structure and environment is safe. It's not that explosion-proof is inherently safer than intrinsic safety.
If you have any questions regarding the selection of explosion-proof ratings or obtaining explosion-proof certifications, feel free to consult Shenzhen ZhongNuo Testing Technology Co., Ltd. at any time.

Can ODM/OEM companies apply for explosion-proof certification and explosion-proof 3C certification? What are the requirements?
Many customers are asking whether their products are OEM-manufactured, ODM-branded, or purchased.
Can you process an explosion-proof certification or an explosion-proof 3C certification?
Here, ZhongNuo Testing introduces the requirements and conditions for obtaining explosion-proof certificates and explosion-proof 3C certifications.
If applying for an explosion-proof certification, the company only needs to provide the product's design drawings and samples.
No specific requirements for a production factory. Therefore, whether it's an OEM, ODM, or a product purchased directly,
As long as the required drawings and samples for certification are provided, a防爆合格证 can be issued.
Of course, the provided drawings and samples must comply with the requirements of the explosion-proof certification standards.
Applying for the explosion-proof 3C certification requires an additional factory audit and an annual supervision and evaluation, compared to the explosion-proof qualification certificate.
Therefore, applicants must have their own manufacturing factory/OEM/ODM facility. The application process is also more complex and the cost is higher, with a longer timeline.
ZheNuo Inspection has been deeply involved in the explosion-proof field for many years, well-versed in the requirements of the GB/T 3836 series standards.
Extensive experience in design and modification guidance for explosion-proof products.
We offer a one-stop service for explosion-proof certification, including design modification, drawing evaluation, certification acquisition, factory audit, and explosion-proof 3C certification.
We have extensive evidence collection cases and experience; feel free to send us a private message!

What standards are used for explosion-proof certification? What are the technical requirements?
Explosion-proof is a type of explosion prevention for electrical equipment.
Its housing is designed to withstand explosive mixtures entering through the housing joints or structural gaps and to explode internally without damaging the housing.
And ignite an explosive gas atmosphere formed by one, multiple gases or vapors.
Explosion-proof casings must possess both explosion-proof and anti-explosion capabilities. Generally, the casings of explosion-proof products are rather bulky, suitable for fixed installations and equipment.
Explosion-proof face width, gap, and roughness are the three key elements of explosion-proof housing design.
Design requirements for explosion-proof triad elements vary depending on the different explosive gas environments 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.
Chinano Inspection has long focused on explosion-proof product design, testing, and certification services.
We have a dedicated team in the explosion-proof field, well-versed in explosion-proof standard requirements.
We offer explosion-proof housing design, illustration, modification guidance, and certification agency services.
If you have a similar need, feel free to send us a private message anytime!

What does the explosion-proof marking Ex db ib IIC T4 Gb mean?
The explosion-proof marking can be considered as a symbol of an explosion-proof device, through which one can understand the type of explosion-proofing adopted by the equipment.
Applicable to explosive areas and explosion-proof zones, etc. What is an explosion-proof sign? What does an explosion-proof sign mean? How to interpret the explosion-proof signs of explosion-proof equipment?
In response to these issues, ZN Testing provides a detailed explanation for your reference.
For example, explosion-proof marking Ex db ib IIC T4 Gb.
This is a composite explosion-proof marking.
Ex indicates explosion-proof, all explosion-proof equipment must be marked with the Ex symbol.
DB IB refers to the explosion-proof protection type of the equipment, meaning it is both explosion-proof and intrinsically safe.
IIC refers to equipment suitable for explosive gas atmospheres of IIC category gases (representative gas is and).
T4 is the temperature category, indicating that the surface temperature of the equipment does not exceed 135°C.
Gb refers to the equipment protection level, applicable to Zones 1 and 2.
The example above illustrates a common explosion-proof marking used for equipment in an explosive gas atmosphere.
If the equipment is used underground in coal mines or in environments with combustible dust, the explosion-proof markings are different.
If it's an ATEX explosion-proof certification mark, it gets more complex.
Business clients, if you need more information on explosion-proof certifications and explosion-proof markings, feel free to message us anytime!
Explosion-proof Certification Application Consulting Service - Shenzhen Zhongnuo Testing Technology Co., Ltd.