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.
Process for applying for a防爆 certification at Shenzhen ZhongNuo Testing Technology Co., Ltd.
1. Conduct product evaluation and initial quotation for the applied products. Evaluate the product using the company's product specification, electrical schematics, and component list, determine the suitable type of explosion-proof certification for the product, and provide an initial quotation.
2. Offer samples for testing at the lab; the quantity of samples required varies depending on the product category.
3. Provide documentation list review
Application documents, including applicant's information and related materials
(2) Technical documents, including the submitted technical materials by the company, such as corporate standards or technical requirements, product drawings, user manuals, etc.
A. Corporate Standards/Technical Requirements: The corporate standards/technical requirements for the product should be written in accordance with the specified format. The content should include not only the performance requirements of the product but also relevant aspects of explosion-proofness: such as basic parameters, explosion-proof markings, operating environmental conditions, explosion-proof performance requirements, relevant tests for explosion-proof performance, and markings related to explosion-proofness.
B. Product Drawings - When applying for a explosion-proof certification for intrinsically safe electrical equipment, the applicant should provide assembly drawings, circuit diagrams, printed circuit board drawings, silk-screened drawings, material lists of components, and label drawings, etc. For the explosion-proof certification of non-intrinsically safe 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 assembly drawing can clearly indicate the explosion-proof parameters and structure of the product, only the assembly drawing needs to be submitted for inspection.
C. Instruction Manual - The instruction manual should include basic parameters, explosion-proof markings, product outline diagrams, installation, maintenance, order requirements, and clear instructions to the user regarding the precautions to ensure the product's explosion-proof performance during installation and use.
D. Other Information: For products with adhesive bonding or casting, provide the model names, performance descriptions, and relevant process documents for the adhesive and casting agents. For plastic shell products, provide the material and corresponding performance documents.
4. Certificate of Origin

Classification of Explosion-proof Certification -- Shenzhen Zhongnuo Testing Technology Co., Ltd.
Explosion-proof certification is the process of determining if equipment meets the requirements of explosion-proof standards, type testing, and routine tests applicable to it, and issuing the relevant certificates of compliance. Certificates can be issued for Ex equipment or Ex components.
Different regions have varying certification standards and systems for explosion-proof electrical products. Currently, international explosion-proof certifications include domestic explosion-proof certification, ATEX certification, IECEx certification, and North American explosion-proof certification.

Domestic explosion-proof certification models are divided into three scenarios -- Shenzhen Zhongnuo Testing Technology Co., Ltd.
1. Explosion-proof certification system
Applicable Products: Electrical and non-electrical equipment for areas with explosive gases and dust, not for mining use (except for products listed in the Explosion-proof 3C Catalogue)
Certification Model: Product Testing
Certification Certificate: Explosion-Proof Qualification Certificate
Certificate Validity: 5 years
Annual Audit Required: No
2. Intrinsically Safe 3C Certification System
Applicable Products: Electrical Equipment listed in the Explosion-Proof 3C Catalog
Certification Mode: Combination of Type Testing and Factory Audit
Certification Certificate: CCC Certificate
Certificate Validity: 5 years
Annual Audit: Yes, an annual audit is required
3. Coal Safety/Mine Safety Certification System
Applicable Products: Various electrical and non-electrical equipment for use in both coal and non-coal mines
Certification Model: Combination of Type Testing and Factory Audit
Certification Certificate: Mining Product Safety Mark Certificate
Certificate Validity: 5 years
Annual Audit: Yes, an annual audit is conducted.

How to differentiate between II and III explosion-proof certification?
Explosion-proof electrical equipment is categorized into different types based on usage locations, such as Class I explosion-proof certification, Class II explosion-proof certification, and Class III explosion-proof certification, etc.
We refer to the I-type explosion-proof certification as the certification for underground coal mine equipment, typically used in conjunction with the coal safety certificate of the equipment.
Class II explosion-proof certificate refers to the certification for explosion-proof equipment used in non-mining explosive gas environments, such as equipment used in petrochemical, gas, oil storage facilities, etc.
Type III explosion-proof certificate refers to the certification for explosion-proof equipment used in non-mining explosive dust environments, such as equipment used in spray painting, sanding, feed, food, and other applications.
The distinction between the explosion-proof certification of Class I, Class II, and Class III primarily lies in the different usage locations of the equipment.
The current domestic explosion-proof certification standards are primarily based on the GB/T3836 series. The original GB12476 (dust) and GB25286 (non-electrical) series standards have also been integrated into GB/T3836.
explosion-proof certification application consulting service - Shenzhen ZhongNuo Testing Technology Co., Ltd.