How to apply for explosion-proof certification in Zone 2? Shenzhen Zhongnu Inspection

Shenzhen ZhongNuo Testing Technology Co., Ltd. is based in South China and specializes in explosion-proof certification and coal mine safety certification application consulting services, offering one-stop explosion-proof technology consulting services.
What are the requirements for enterprises to apply for explosion-proof certification? -- Shenzhen ZhongNuo Inspection & Testing Technology Co., Ltd.
For enterprises, there are no special requirements for applying for domestic explosion-proof certificates (except for the explosion-proof 3C certification).
Primarily, it's to check if the product meets the explosion-proof standards and if the required certification documents can be provided.
If the product falls under the explosion-proof 3C certification catalog, the applicant must have a production factory (OEM/ODM is also acceptable).
Because the explosion-proof 3C certification is a certification model that adopts type testing + factory inspection.
In addition to product testing, an annual review of the manufacturing facility is required.

Why Do Companies Need Explosion-Proof Certification?
Explosion-proof certification refers to the process of determining whether equipment meets explosion-proof standards, requiring type testing and the issuance of relevant certificates of conformity. It primarily targets Ex equipment or Ex components. Explosion-proof products generally refer to explosion-proof electrical products: electrical products or components with explosion-proof functions designed for environments where explosions may occur, capable of igniting surrounding explosive atmospheres under specified conditions.
Safety of explosion-proof equipment is closely related to safe production, which is why many countries implement explosion-proof certification for electrical products. Explosion-proof products must obtain an explosion-proof certification before they can be used in flammable and explosive hazardous areas. The #explosion-proof certification# is essential for ensuring the safe use of explosion-proof electrical products.
Blast-proof certification can boost product exports and further enhance the credibility and reputation of both the company and its products, increasing market competitiveness. Companies in need of certification can obtain blast-proof certification domestically.

Non-metallic surface resistance limit requirements for explosion-proof equipment
In hazardous areas with explosive dust or gases/vapors, such as coal powder, flour, etc., 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 an 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 500 mm², the risk of static electricity can be disregarded; if it exceeds this limit, a surface resistance test must be conducted for verification. The criteria for determination are the same as those for the surface resistance test limit requirements for Class II gas environments. For fixed-installed equipment that cannot meet the surface resistance limit, an "X" can be added after the "Explosion-proof" symbol, a corresponding warning sign should be placed on the equipment, and the user should be informed in the user manual.

Intrinsically Safe Certification refers to a product certification for equipment and products used in flammable and explosive environments. To meet the requirements of the Intrinsically Safe Certification standards, certain measures must be taken, which we refer to as Intrinsically Safe protection types. Common types of Intrinsically Safe protection include Intrinsic Safety, Explosion-Proof, Positive Pressure, and Increased Safety, among others.
Clearly, intrinsic safety is just one type of explosion-proof protection.
Different explosion-proof protection types have varying design requirements for the product.
Intrinsically safe designs limit electrical energy, ensuring that even in the event of a fault, the energy produced is not sufficient to ignite surrounding flammable or explosive environments. As a result, intrinsically safe devices have specific limitations on electrical parameters such as current, voltage, capacitance, and inductance, and are generally suitable for low-power equipment. Additionally, there are clear requirements for the power supply methods, plastic casings, and wireless transmission of these devices.
As a long-standing third-party organization specializing in explosion-proof certification, Shenzhen ZhongNuo Testing Technology Co., Ltd. has dedicated engineers for intrinsic safety circuit and structural design. We offer technical consultation on explosion-proof circuit design, drafting, and rectification, and have extensive experience in designing and obtaining certifications for intrinsic safety levels ia, ib, and ic. If you have certification needs in this area, feel free to send us a private message!
explosion-proof certification application consulting service - Shenzhen ZhongNuo Inspection Technology Co., Ltd.