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 one-stop explosion-proof technology consulting services.
Domestic explosion-proof certification
Domestic explosion-proof certification is a compliance inspection for explosion-proof products used in explosive environments (including electrical and non-electrical products), issuing explosion-proof certificates to those products that meet the GB/T3836 standard. Currently, the domestic explosion-proof certification standards are essentially equivalent to the international IEC60079 standard system.

What's the difference between corrosion protection grade, protection grade, and explosion-proof certification grade?
Many corporate clients are often in the dark about the required corrosion resistance, protection, and explosion-proof certification levels for their products.
Due to the products' names differing by just one character, and both indicating a level of the product, they are similar yet distinct. So, what are the differences between them?
Corrosion prevention involves measures taken to protect metals prone to rust, aiming to extend their service life. This is typically achieved through physical, chemical, and electrochemical corrosion prevention methods. There are five common levels: indoor F1, F2, and outdoor WF, WF1, and WF2.
Protection rating, commonly known as IP rating, refers to the dust and water resistance level of the equipment, usually consisting of "IP" followed by two digits.
The explosion-proof grade generally refers to the certification level of the equipment's explosion-proof rating. Each electrical equipment applying for an explosion-proof certification will have a corresponding explosion-proof marking, including the explosion-proof type and grade. The explosion-proof grade indicates the product's applicable explosion-proof area, gas/dust group, temperature group, and equipment protection level, etc.
Clearly, these are different concepts from different fields. For more information on this topic, feel free to message us anytime!

The cost of obtaining explosion-proof certification at Shenzhen Zhongnuo Testing Technology Co., Ltd. is related to the following aspects:
1. Do you need a防爆certificate or a防爆3C certification? For the防爆3C certification, a factory audit is required, 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 indicate 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 a retest? Some customers' products haven't been designed for explosion-proof at all, and they need to be modified when brought here, which adds to the cost. If the product includes a battery, the battery testing is also an additional expense, especially for those batteries that always fail the tests.
5. Needed or Not. Labs are often booked solid, with long waiting lists. If needed, there will be a fee involved.

What test projects are required to apply for an explosion-proof certificate?
Explosive-proof products require passing relevant test requirements of the explosive-proof standards to obtain an explosive-proof certificate.
Different explosion-proof types, catering to equipment used in various explosive environments, require different explosion-proof testing items.
Many clients also want to know what testing items are required for explosion-proof products? What specific requirements are there for the explosion-proof design of the products?
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.
Explosion-proof products mainly undergo tests including heat and cold resistance, internal ignition without propagation, shell pressure resistance, IP testing, temperature rise testing, etc.
Different testing items, tailored to various modules or components of the product.
Each test item ensures that the product meets the explosion-proof standards and achieves the required explosion-proof performance.
If a company is designing explosion-proof products and is unaware of the explosion-proof standards requirements,
ZhongNuo Inspection can provide guidance services for explosion-proof circuit design and explosion-proof structural design, including explosion-proof standard requirements, design key points, drawing guidance, etc.
We also offer proxy services for explosion-proof testing and certification.
Need this? Feel free to message us anytime!
Explosion Proof Certification Application Consulting Service - Shenzhen ZhongNuo Testing Technology Co., Ltd.