Shenzhen ZhongNuo Inspection & 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 is the difference between obtaining the ATEX certification and the Coal Mine Safety certification for products?
intrinsic safety certification, also known as intrinsic safety explosion-proof certification.
In the explosion-proof industry, there are various explosion-proof protection types such as separation type, intrinsic safety type, increased safety type, positive pressure type, and sealed type, etc.
intrinsic safety is just one type of explosion-proof design; equipment utilizing this type of explosion-proof design is used in explosive areas.
Due to the restrictions on its working voltage, current, capacitance, inductance, etc.
Even if sparks occur within the circuit, they are not sufficient to ignite the surrounding explosive environment, making it inherently safe.
The intrinsic safety certification is widely applied to low-power, low-energy instruments, handheld terminal products, and other similar equipment.
Coal Mine Safety Certification is a mandatory safety certification for equipment used underground in coal mines.
Due to the presence of explosive substances like methane in underground coal mines, electrical equipment used in such mines must be equipped with protective measures to ensure explosion-proof performance.
Select appropriate explosion-proof protection types such as intrinsic safety, flameproof, and encapsulation based on product structure, electrical parameters, installation method, and usage area.
It's worth noting that electrical equipment applying for the Coal Mine Safety Certification must not only possess explosion-proof capabilities but also meet performance tests for the special underground environment of coal mines.
ZhongNuo Inspection has long been focused on explosion-proof certification and coal safety certification.
Proficient in certification standards, familiar with the explosion-proof design, modification, testing, certification, and factory audit processes and requirements for products.
Facilitates rapid acquisition of explosion-proof certification and coal mine safety certification for businesses.

What documents are required to apply for an explosion-proof certification?
1. Product Documentation: When an enterprise applies for a certification of explosion-proof compliance for intrinsic safety electrical equipment, it should provide assembly drawings, circuit diagrams, printed circuit board diagrams, silk-screened diagrams, material lists for components, and label diagrams, etc. For non-intrinsic safety electrical equipment, the technical documents submitted for inspection should include drawings that reflect the explosion-proof performance of the sample (including assembly drawings and component drawings). If the overall drawing can clearly indicate the explosion-proof parameters and structure of the product, only the overall drawing needs to be submitted for inspection.
2. Technical Documentation: Includes corporate standards/technical requirements. The corporate standards/technical requirements for products should be written in accordance with the specified format, and their content should include not only the performance requirements of the product but also related aspects of explosion-proof: such as basic parameters, explosion-proof markings, usage environmental conditions, explosion-proof performance requirements, related explosion-proof tests, and markings related to explosion-proof.
3. Additional Information: For products with adhesive bonding or casting, provide the型号 and name of the adhesive and casting agent, along with performance descriptions and relevant process documents. For products with plastic casings, supply the material of the plastic and corresponding performance files. Products with batteries require the provision of relevant battery specifications.

Flammability Dust Environment Explosion Proof Certification Standard:
GB/T 3836.1-2021 Explosive Atmospheres Part 1: Equipment General Requirements
GB/T 3836.4-2021 Explosive Atmospheres Part 4: Equipment protected by intrinsic safety "i"
GB/T 3836.5-2021 Explosive Atmospheres, Part 5: Equipment protected by positive pressure enclosure "p"
GB/T 3836.9-2021 Explosive Atmospheres Part 9: Equipment protected by cast-in “m” type enclosures
GB/T 3836.31-2021 Explosive Atmospheres Part 31: Equipment protected by dust-protection enclosures “t”

What does the explosion-proof marking Ex db ib IIC T4 Gb mean?
The explosion-proof marking can be considered a symbol of an explosion-proof device. Through the explosion-proof marking, one can understand the type of explosion-proof design adopted by the equipment.
Applicable to explosive areas and explosion-proof zones, etc.
What is an explosion-proof marking? What does an explosion-proof marking signify? How do you interpret the explosion-proof marking 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 sign.
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 environments of IIC category gases (representative gas is and).
T4 is the temperature category, indicating that the equipment's high surface temperature does not exceed 135°C.
Gb refers to the equipment protection level, applicable to Zones 1 and 2.
Above is an example of a common explosion-proof symbol used in the application of explosion-proof equipment in environments with explosive gases.
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.