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 a one-stop explosion-proof technology consulting service.
What should be noted when applying for an explosion-proof certificate?
1. Is the product design in compliance with the GB/T3836 standards?
2. Can certification documents be provided?
(1) Technical Drawings: Includes circuit diagrams, assembly drawings, structural drawings, PCB layouts, numbering diagrams, BOM sheets, etc.
(2) Product Enterprise Standards and Instructions
(3) Product Name, Model Number, Applicant Company
(4) Samples: Complete unit samples, batteries, uncapped circuit boards, non-metallic material surface blocks, etc.
(5) Additional Materials: Casting Sealing Process Documents, Ex Component Explosion-Proof Certificate Copy, Battery Testing Report, Shell Material Testing Report, Wireless Transmission Power Testing Report, etc.
Not all of the above information is required; it depends on the actual structure and explosion-proof type of the product.
3. Do you have engineers with explosion-proof technology expertise?
4. Are there specific requirements for frequent occurrence institutions and explosion-proof grades?
5. Budget for costs
For more details, please feel free to contact Shenzhen ZhongNuo Inspection Technology Co., Ltd. for further discussion!

What does the explosion-proof marking Exdb eb llB T6 Gb mean?
A complete explosion-proof marking includes:
Ex Mark
Explosion-proof type
Gas/Dust Combination
Temperature Category
Equipment Protection Level
For example: Ex db ib IIc T4 Gb
Ex tb ⅢC T130°C Db
Ex db eb llB T6 Gb
Ex indicates explosion-proof
DB EB indicates the equipment adopts an explosion-proof type with explosion-proof and increased safety design.
llB indicates that the equipment is suitable for explosive gas environments of llB and llA.
T6 indicates the equipment with high surface temperature not exceeding 85°C.
Gb is the protection level of the equipment, suitable for Zones 1 and 2.

What is the relationship between the explosion-proof certificate and the explosion-proof CCC certification?
The explosion-proof certificate and explosion-proof 3C certification are for different types of explosion-proof products.
Explosion-proof 3C Certification is for products listed in the Explosion-proof 3C Catalog. There is a dedicated product catalog for Explosion-proof 3C. Products within the catalog require Explosion-proof 3C Certification, which involves a "Product Testing + Factory Audit" approach, including both type testing of the product and on-site factory audit.
Ex-proof certification is applicable to products not listed in the Ex-proof 3C Catalogue. The certification model involves product testing; once the product passes the testing, an Ex-proof certification can be issued frequently.
Of course, products outside the explosion-proof 3C catalog can also apply for explosion-proof certifications alone, but there's a risk of being penalized by market regulation. This is something for the client to consider on their own.

The cost of the explosion-proof certification at Shenzhen Zhongnuo Testing Technology Co., Ltd. is related to the following aspects:
1. Do you need an explosion-proof certificate or the explosion-proof 3C certification? If the 3C certification is required, a factory audit is necessary, which includes the audit fee, travel expenses for the auditor, and the applying fee and Certificate fee for the 3C certificate.
2. Related to explosion-proof markings. Different explosion-proof markings have different explosion-proof items, and the cost naturally varies accordingly.
3. Domestic explosion-proof certification or international explosion-proof certification? The same explosion-proof mark, ATEX/IECEx certification is much more expensive than the domestic explosion-proof certificate, and it also requires factory audits. North American explosion-proof certification is even more costly, over $100,000+
4. Do you need to retest? Some customers' products haven't even been designed with explosion-proof features, and they still require modifications, which adds to the cost. If the product includes batteries, battery testing is also an additional expense, especially for those batteries that keep failing the tests.
5. Needed or not. Labs are often booked up, and there's often a waiting list. If needed, there will be a fee involved.
Explosion-proof Certification Application Consulting Service - Shenzhen Zhongnuo Testing Technology Co., Ltd.