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.
Expiration and renewal of explosion-proof certificate
The domestic explosion-proof certificate is valid for 5 years from the date of issuance.
If the certificate is about to expire, you may choose to renew it or replace it. When the explosion-proof qualification certificate of the enterprise is about to expire,
The company should provide an application letter for a certificate replacement within three months before and after the validity period, and should bring relevant documents to reapply for the certificate replacement.
Overseas explosion-proof certification, such as ATEX and IECEx certificates, is valid for a specific period.
Because their sampling method is by means of type tests.
A combination of product certification and factory production quality system audit.
Ensure the validity of the certificate.

What test projects are required to apply for an explosion-proof certification?
Explosive-proof products must pass relevant tests according to the explosive-proof standards to apply for an explosive-proof certification.
Different explosion-proof types, catering to equipment used in various explosive environments, require different explosion-proof testing items.
Many customers also want to know what testing projects are required for explosion-proof products? What specific requirements are there for the explosion-proof design of the product?
Below, we'll provide examples of common explosion-proof testing items.
For instance, with intrinsically safe products, typical test items include appearance and structure inspection, spark ignition test, dielectric strength, battery and battery pack testing, temperature rise test, transient energy test, and more.
Flameproof products mainly undergo tests including heat and cold resistance, internal ignition without propagation of explosion, shell pressure resistance, IP testing, temperature rise tests, etc.
Varying test items are conducted for different product modules or components to ensure that each item meets the explosion-proof standards and achieves the required explosion-proof performance.
If a company is designing explosion-proof products and is not familiar with the explosion-proof standards requirements,
ZheNuo Inspection offers guidance services for explosion-proof circuit design and structural design, including explosion-proof standards, design key points, and drawing guidance.
We can also provide consulting services for explosion-proof testing and certification application.
Need something in this area? Feel free to message us anytime!

List of Domestic Explosion-Proof Certification Agencies:
1. Nanyang CNEX
2. Shanghai Coal Research Institute
3. National Electrical Appliance Quality Supervision and Inspection Center
4. Guangdong CQCEx National Explosion-Proof Equipment Quality Supervision and Inspection Center
5. National Coal Mine Explosion-Proof Safety Product Quality Supervision and Inspection Center
6. Jiamusi Explosion-Proof Institute
7. Tianjin PCEC
8. Shanghai NEPSI
9. Beijing Coal Research Institute CCRI, etc.
For applicants, what type of explosion-proof classification to apply for and what level of explosion-proof to choose really remains consistent across all authorized institutions. They are all institutions that have been certified and authorized by the state, equipped with testing conditions that meet standard requirements, adhering to the same standards, and conducting the same testing. Under the same conditions, the trend of opting for institutions offering more cost-effective services at more affordable prices is inevitable, which is also a significant reason for the growing popularity of emerging explosion-proof enterprises.

Does the explosion-proof certification include the explosion-proof 3C certification?
Currently, domestic explosion-proof certifications include the Explosion-Proof 3C Certification and the Explosion-Proof Compliance Certificate.
The explosion-proof certificate and the explosion-proof 3C certification are for different types of explosion-proof products, belonging to different certification models.
As of October 1, 2009, a portion of explosion-proof electrical equipment was included in the CCC certification catalog, which is a mandatory product certification.
Products within the catalog are subject to explosion-proof 3C certification, adopting the "Product Testing + Factory Audit" model.
Both product type tests and factory on-site evaluations are required.
Ex-proof certification is applicable to products not listed in the Ex-proof 3C Catalogue. The certification model is Product Testing; upon successful completion of Product Testing, an Ex-proof certification can be issued.
Of course, products outside the explosion-proof 3C catalog can also apply for explosion-proof certificates alone, but there is a risk of being penalized by market supervision. This is something for the customer to consider independently. When inquiring, the customer should first confirm the product type and then decide on the certification model. If you're unsure whether the product is within the explosion-proof 3C catalog, you can private message Shenzhen ZhongNuo Inspection & Testing Technology Co., Ltd. for an evaluation and confirmation!
Explosion-proof Certification Application Consulting Service - Shenzhen Zhongnuo Testing Technology Co., Ltd.