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.
List of Domestic Explosion-Proof Certification Institutions:
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 and what level of explosion-proof to choose are essentially the same across all authorized institutions. They are all state-certified and authorized institutions, with testing conditions that meet standard requirements, adhering to the same standards and conducting the same testing. Under the same conditions, the trend is inevitable to opt for institutions offering more cost-effective services at more affordable prices. This is also a significant reason for the growing popularity of emerging explosion-proof enterprises.

Certification standards for explosion-proof equipment used in environments with explosive gas:
GB/T 3836.1-2021 Explosive Atmospheres – Part 1: Equipment – General Requirements
GB/T 3836.2-2021 Explosive Atmospheres, Part 2: Equipment protected by explosion-proof enclosures "d"
GB/T 3836.3-2021 Explosive Atmospheres, Part 3: Equipment protected by intrinsic safety "i"
GB/T 3836.4-2021 Explosive Atmospheres, Part 4: Equipment protected by intrinsic safety "i"
GB/T 3836.5-2021 Explosive Atmospheres, Part 5: Equipment protected by positive pressure housing “p”
GB/T 3836.6-2017 Part 6: Equipment protected by liquid immersion type “o” for explosive environments
GB/T 3836.7-2017 Explosive Atmospheres Part 7: Equipment protected by sand filling type “q”
GB/T 3836.8-2021 Explosive Atmospheres Part 8: Equipment protected by "n" type protection
GB/T 3836.9-2021 Explosive Atmospheres Part 9: Equipment protected by “m” type of cast-in glands

The cost of obtaining explosion-proof certification at Shenzhen Zhongnuo Testing Technology Co., Ltd. is related to the following aspects:
1. Should we go for a防爆certificate or the防爆3C certification? If the防爆3C certification is chosen, it requires a factory audit, and additional costs will apply, including the audit fee, travel expenses for the auditor, the application fee for the 3C certificate, and the Certificate fee.
2. Related to explosion-proof markings. Different explosion-proof markings correspond to different explosion-proof items, and naturally, the costs vary 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 a factory audit. 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 for explosion-proof, and they still need to be rectified, which adds to the cost. If the product includes a battery, battery testing is also an expense, especially for those batteries that keep failing the tests.
5. Is it required? The labs are often booked solid, and there's often a waiting list. If needed, there will be a fee involved.

What is the difference between obtaining the ATEX certification and the Coal Mine Safety certification for products?
intrinsic safety certification, also known as intrinsic safety explosion-proof certification.
In the explosion-proof industry, there are various types of explosion-proof protection, including separation type, intrinsically safe, increased safety, positive pressure, and sealed type, etc.
intrinsic safety is just one type of explosion-proof design; equipment utilizing this type of explosion-proof design is used in explosive areas.
Due to the limitations on its working voltage, current, capacitance, inductance, etc.
The circuit inside produces sparks, but it's not enough to ignite the surrounding explosive environment, making it inherently safe.
Intrinsically safe certification is widely used in low-power, low-energy instruments, handheld terminal products, and similar devices.
Coal Mine Safety Certification is a mandatory safety certification for equipment used underground in coal mines.
Due to the presence of explosive substances like methane in coal mine shafts, electrical equipment used in coal mine shafts must be equipped with protective measures to achieve explosion-proof performance.
Select appropriate explosion-proof protection types, such as intrinsic safety, flameproof, and encapsulation, based on product structure, electrical parameters, installation methods, and usage areas.
It's worth noting that electrical equipment applying for the Coal Mine Safety Certification must not only have explosion-proof capabilities but also meet performance tests for the special underground environment of coal mines.
ZheNuo Inspection has long been focused on explosion-proof certification and coal safety certification, well-versed in certification standards.
Familiar with the explosion-proof design, modification, testing, certification, and factory audit processes and requirements, we can help businesses quickly obtain explosion-proof and coal safety certifications.
Explosion-proof Certification Application Consulting Service - Shenzhen Zhongnuo Testing Technology Co., Ltd.