Yinchuan 21 Explosion-proof Certification Consulting Agency

Shenzhen Zhongnuo Testing Technology Co., Ltd. is based in South China, specializing in explosion-proof certification and coal safety certification application consulting services, offering one-stop explosion-proof technology consulting services.
Do I need to have a flameproof design done before applying for a flameproof certification for the product?
That's a given.
The product undergoes explosion-proof certification, which is the process of passing relevant explosion-proof standard test items to obtain an explosion-proof qualification certificate.
To ensure products pass the explosion-proof standard test items, it is necessary to design the products according to the test requirements, which is to implement explosion-proof design.
For explosion-proof requirements, refer to GB/T3836.1 and GB/T3836.2; for intrinsic safety design, consult GB/T3836.1 and GB/T3836.4; and for positive pressure design, refer to GB/T3836.1 and GB/T3836.5.
If your equipment is looking to apply for explosion-proof certification and enter the explosion-proof market, reach out to us via private message right away! ZhongNuo Testing has been deeply involved in the explosion-proof field for many years, well-versed in the technical requirements of GB/T3836 and EN/IEC60079 explosion-proof standards, offering explosion-proof product rectification and design guidance, and a one-stop explosion-proof technical solution.

Limitation requirements for surface resistance of non-metallic housing of explosion-proof equipment
In hazardous areas with explosive dust or gases/vapors, such as coal powder and flour, static electricity can cause fires or explosions, posing significant danger. Therefore, it is advisable to minimize the use of insulating materials in explosive hazard areas. When selecting electrical insulating materials, consider maintaining low insulation resistance to prevent discharge when non-metallic components come into contact with charged components. For non-metallic insulating materials, the antistatic capability of the equipment can be assessed by measuring the surface resistance of the equipment's housing.
Surface resistance, measured in ohms (Ω), refers to the resistance between two electrical contacts on the measuring surface.
In accordance with the requirements of the IEC 60079 series standards:
1. In Category II explosive gas environments, when the surface area of a non-metallic enclosure of electrical equipment exceeds a certain limit (as shown in Table 1), a surface resistance test must be conducted on the non-metallic material to ensure: by selecting the material, the surface resistance meets at least one of the following requirements when measured according to IEC 60079-0 26.13:
At ≤1 GΩ, (505)% relative humidity;
At ≤100 GΩ, (305)% relative humidity.
2. In environments with Class III explosive dust, if the surface area of the non-metallic housing of electrical equipment does not exceed 500mm², the risk of static electricity can be disregarded; if it exceeds this limit, a surface resistance test must be conducted for verification. The requirements for assessment are the same as those for the surface resistance test limit in Class II gas environments. For fixed-installed equipment that cannot meet the surface resistance limit, an "X" can be added after the "Explosion-Proof" marking, a corresponding warning sign should be placed on the equipment, and the user should be informed in the user manual.

What are common misconceptions about applying for explosion-proof certification for products?
The explosion-proof grade is not the higher, the better.
Explosion-proof ratings are related to product structure, installation methods, and usage locations; selecting the appropriate one is sufficient. 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 the same as protection rating.
The protection grade, commonly referred to as the IP rating, is different from the explosion-proof grade.
3. Temperature categories are not the higher, the better; instead, the lower, the safer they are.
Temperature groups indicate the high surface temperature a device can reach 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. The explosion-proof type is safer than intrinsically safe. Many clients believe that having an explosion-proof shell offers more safety than being intrinsically safe, which is a misconception. These are different explosion-proof types, both of which can achieve explosion-proof protection. If they are suitable for the product structure and environment, they are considered safe.
Welcome to私信Shenzhen ZhongNuo Testing Technology Co., Ltd. for specific communication.

What is an Intrinsically Safe Explosion Proof Certificate? What are the requirements for applying for an Intrinsically Safe Explosion Proof Certificate?
The explosion-proof equipment primarily ensures safety by controlling the electrical parameters of the device circuit and limiting the entire circuit's energy to meet the explosion-proof requirements.
Key measures include reducing voltage and current, and controlling parameters of energy storage components such as inductors and capacitors.
The design reference standards are GB/T3836.1 and GB/T3836.4.
Customers applying for the explosion-proof certification of security systems must provide electrical schematics, block diagrams, PCB layouts, and tag number diagrams.
Product assembly drawings, manuals, corporate standards, and other documentation.
Recently, ZhongNuo Testing has obtained temperature vibration sensors, remote transmitters, monitoring devices, and Bluetooth beacons for our clients.
The explosion-proof certificates for products like walkie-talkies are all of intrinsic safety type explosion-proof configurations.
If you also have products that require ATEX certification for explosion-proof, feel free to message us!
Explosion-proof Certification Application Consulting Service - Shenzhen Zhongnuo Testing Technology Co., Ltd.