Shenzhen ZhongNuo Inspection - Intelligent Robot Explosion Proof Certification Consulting Center - Full Process Assistance

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.
Domestic explosion-proof certification
Domestic explosion-proof certification is a compliance inspection for explosion-proof products used in explosive environments (including electrical and non-electrical products).
Issue explosion-proof certificates for products that meet the GB/T3836 standard.
Current domestic explosion-proof certification standards are essentially equivalent to the international IEC 60079 standard system.

Limitation requirements for surface resistance of non-metallic外壳 of explosion-proof equipment
In hazardous areas with explosive dust or gases, such as coal dust and flour, static electricity can cause fires or explosions, posing significant risks. Therefore, it is advisable to minimize the use of insulating materials in explosive hazard zones. When selecting electrical insulating materials, consider maintaining a low insulation resistance to prevent discharges when non-metallic components come into contact with charged parts. For non-metallic insulating materials, the anti-static capability of the equipment can be evaluated by measuring the surface resistance of the equipment's casing.
Surface Resistance, measured in ohms (Ω), refers to the resistance between two electrical contacts on the measuring surface.
In compliance with the requirements of the IEC 60079 series standards:
1. In Category II explosive gas environments, when the surface area of the non-metallic housing of electrical equipment exceeds a certain limit value (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, surface resistance testing is required for verification. The requirements for evaluation are the same as those for surface resistance testing limits in Class II gas environments. For fixed installation equipment that cannot meet the surface resistance limits, a warning symbol can be added after the "Explosion-proof" sign, with an appropriate warning label on the equipment, and the user should be informed in the user manual.

Is applying for an explosion-proof certification the same as obtaining an explosion-proof qualification certificate?
Many clients inquire during consultations: What's the difference between applying for an explosion-proof certification and an explosion-proof compliance certificate?
Explosion-proof certification and explosion-proof compliance certificates are two distinct concepts.
The product has passed the explosion-proof certification, resulting in the issuance of an explosion-proof certificate. The explosion-proof certification is the process, while the explosion-proof certificate is the outcome.
So the client said the product needs a explosion-proof certification or explosion-proof compliance certificate.
The product must pass the explosion-proof standard tests and meet the standard requirements to obtain an explosion-proof certification.
Explosion-proof certifications can be categorized according to different protection types, such as intrinsic safety, flameproof, pressurized, and encased.
Shenzhen ZhongNuo Inspection boasts a dedicated team of explosion-proof engineers who can provide initial design services for explosion-proof circuits and structures.
Assist companies in preparing the drawings, specifications, and manuals, as well as enterprise standards, required for explosion-proof certifications, helping them obtain the explosion-proof qualification certificate.
If you need certification in this area, feel free to message us!

How to Apply for Explosion-Proof Certification for Enterprises:
1. Self-Application: The company applies directly to the certification body, prepares relevant documents independently, assists in debugging the prototype, and modifies any non-standard parts in the documents. This process is relatively longer and more expensive, requiring more time and effort.
2. Agent Application: Refers to the entire consultation and application process with Shenzhen ZhongNuo Testing Technology Co., Ltd., including material modifications, prototype debugging, and progress coordination, all handled by the consulting agency, ensuring a smooth progress. Short cycle, simple process, controlled overall costs, saves time and effort.
Explosion-Proof Certification Application Consultation Services - Shenzhen ZhongNuo Testing Technology Co., Ltd.