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.
How to Apply for an Explosion-Proof Certification:
1. Self-Application: The company applies directly to the certification body, prepares relevant documents independently, assists in the debugging of prototypes, and modifies any irregularities in the documents. This process is relatively longer, with higher overall costs and requires more time and effort.
2. Agency Application: Refers to the entire consultation and application process with Shenzhen Zhongnuo Testing Technology Co., Ltd., including material revisions, prototype debugging, and progress coordination handled by the consulting agency, ensuring a well-protected progress. Quick certification, controllable comprehensive costs, saves time and effort.

Division of explosion-proof areas in flammable dust environments -- Shenzhen ZhongNuo Testing Technology Co., Ltd.
Explosive atmospheres are classified based on the different physical states of substances present at the site, into environments with explosive gases and flammable dust. The danger zones for environments with different physical states are divided into three zones according to the duration of the presence of hazardous substances at the site.
For combustible dust environments, it is Zones 20, 21, and 22.
Areas 20 - environments where combustible dust is continuously present or present for extended periods, typically above 1000 hours per year.
Zone 21 — Areas where combustible dust atmospheres may occur during normal operation, typically 10-1000 hours/year.
Area 22 is not expected to have a flammable dust environment in normal operation or to occasionally experience such conditions for a short duration, typically below 10 occurrences per year.

What are the requirements for enterprises to apply for explosion-proof certification? -- Shenzhen ZhongNuo 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 about checking if the product meets explosion-proof standards and if the required certification documents can be provided.
If the product falls under the explosion-proof 3C certification category, the applicant must have a production factory (OEM/ODM is also acceptable).
Because the explosion-proof 3C certification is a certification model that involves both type testing and factory inspection.
In addition to product testing, an annual audit of the production facility is required.

Blastproof certification is the process of determining if equipment meets the requirements of blastproof standards, type testing, and applicable routine tests, and issuing the relevant qualification certificates.
Certificates are available for Ex equipment or Ex components.
The防爆标准GB/T3836 specifies that electrical equipment trial-produced by manufacturers according to the explosion-proof type standards listed in GB/T3836 is indicated.
All must be tested for explosion-proof compliance by authorized national institutions according to the relevant standards and obtain an explosion-proof certificate.
This means that explosion-proof products must obtain the relevant explosion-proof certification.
Explosion-proof Certification Application Consultation Service - Shenzhen ZhongNuo Testing Technology Co., Ltd.