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 one-stop explosion-proof technology consulting services.
Application Process for Explosion-Proof Certification at Shenzhen Zhongnuo Testing Technology Co., Ltd.
1. Conduct product assessment and provide an initial quotation for the requested items. Evaluate the product based on the company's product specification, electrical schematic, and component list, determining the appropriate type of explosion-proof certification suitable for the product and offering an initial quotation.
2. Provide samples for testing at the lab; the quantity of samples required varies depending on the product category.
3. Provide documentation list review
Application materials, including the applicant's information and product details
(2) Technical Documentation - The submitted technical documents by the company include corporate standards or technical requirements, product drawings, user manuals, etc.
A. Company Standards/Technical Requirements: The company standards/technical requirements for products should be written in the prescribed format, including not only performance requirements but also relevant content concerning explosion-proof aspects: such as basic parameters, explosion-proof markings, environmental conditions for use, explosion-proof performance requirements, relevant tests for explosion-proof performance, and markings related to explosion-proof.
B. Product Drawings: When an enterprise applies for a certification of explosion-proof compliance for intrinsically safe electrical equipment, it should provide assembly drawings, circuit diagrams, printed circuit board drawings, silk-screening drawings, material lists for components, and label drawings, etc. For 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 overall drawing can clearly indicate the explosion-proof parameters and structure of the product, only the overall drawing needs to be submitted for inspection.
C. User Manual - The user manual should include basic parameters, explosion-proof markings, product outline diagrams, installation, maintenance instructions, order requirements, and clear notices to users 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 adhesives and casting agents. For plastic shell products, provide the material of the plastic and corresponding performance documents.
4. Certificate of Origin

Division of explosion-proof areas in explosive gas environments
Explosive atmospheres are classified based on the physical state of substances present at the site, distinguishing between explosive gas environments and flammable dust environments. These hazardous areas, categorized by the duration of presence of dangerous substances, are further divided into three zones under the two different physical states.
That is: for explosive gas environments, Zones 0, 1, and 2.
Zones 0: Continuous or long-term presence of explosive gas atmospheres, usually exceeding 1000 hours per year.
Zone 1 - Areas where explosive gas environments may occur during normal operation, typically 10-1000h/year
Zone 2 - Under normal operating conditions, explosive gas atmospheres are not likely to occur or, if they do, are only present for short periods and infrequently, generally less than 10 hours per year.

What are the standards for explosion-proof certification? What technical requirements are there?
An explosion-proof type is a type of explosion-proof design for electrical equipment.
The housing is capable of withstanding explosive mixtures entering the housing through the housing joint surfaces or structural gaps, without damage upon internal explosion.
And cause ignition of an explosive gas atmosphere formed by one or more gases or vapors.
The explosion-proof housing must possess both explosion-proof and explosion-resistant capabilities. Generally, the outer shells of products designed for explosion-proofing are rather heavy and are suitable for fixed installations and equipment.
Explosion-proof interface width, gap, and roughness are the three key elements of explosion-proof housing design.
Design requirements for explosion-proof three elements vary depending on the different explosive gas environments in mining Class I, non-mining Class IIA, IIB, and IIC.
Please refer to the design standards of GB/T3836.1 and GB/T3836.2 for specifics.
ZhongNuo Inspection has long been dedicated to explosion-proof product design, testing, and certification services.
Our team in the explosion-proof field is well-versed in explosion-proof standards and requirements.
We offer explosion-proof housing design, illustration, modification guidance, certification agency services.
If you have a similar need, feel free to send a private message to Shenzhen ZhongNuo Inspection & Technology Co., Ltd. anytime!

Domestic explosion-proof certification models are categorized into three scenarios -- Shenzhen ZhongNuo Testing Technology Co., Ltd.
1. Explosion-proof certification system
Applicable Products: Electrical and non-electrical equipment used in places with explosive gases and dust, excluding those for mining purposes (except for products listed in the Explosion-proof 3C Catalogue).
Certification Model: Product Testing
Certification Certificate: Explosion-Proof Compliance Certificate
Certificate Validity: 5 years
Annual Audit Required: No
2. Explosion-proof 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
Whether Annual Audit: Annual Audit Required
3. Coal Safety/Mine Safety Certification System
Applicable Products: Various electrical and non-electrical equipment for use in both coal mines and non-coal mines underground
Certification Model: Combination of Type Testing and Factory Audit
Certification Certificate: Mine Product Safety Mark Certificate
Certificate Validity: 5 years
Annual Audit: Yes, an annual audit is conducted.
Explosion-proof Certification Application Consulting Service - Shenzhen Zhongnuo Testing Technology Co., Ltd.