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 a one-stop explosion-proof technology consulting service.
How to apply for an explosion-proof certification for a modular equipment?
There is an increasing number of modular equipment used in explosion-proof environments, providing more complex functionalities. In response to the technical requirements for explosion-proof certification of such equipment, ZN Testing has summarized years of industry experience, highlighting the following key points:
Blast-proof performance is only considered for the electrical part, including the installation and connection between electrical components, grounding, etc., without considering the steel structure part.
(2) Electrical components must be purchased and installed with a防爆 certification or a防爆3C certificate. If suitable explosion-proof electrical components cannot be obtained, consider using explosion-proof/positive pressure methods for installation.
(3) The explosion-proof marking of the selected explosion-proof electrical components must not be lower than the explosion-proof marking grade of the entire machine.
(4) Explosion-proof electrical components must be installed, electrical connections, grounding, etc., in compliance with standard requirements.
In the field of obtaining certifications for assembled equipment, China Nuotech Inspection boasts a technical team and industry experience, capable of providing guidance on explosion-proof designs such as positive pressure and flameproof.
Guide customers in selecting electrical equipment, installation, and preparation of technical drawings and documents.
We can also assign engineers for on-site inspections to reduce customers' cost and time for evidence collection.
Successful acquisition cases include robots, AGV vehicles, industrial ovens, high and low-temperature chambers, filling machines, refueling machines, portable fueling stations, chemical storage cabinets, dust removal equipment, etc.
Seeking this kind of need? Feel free to DM us for further discussion!

Domestic explosion-proof certification models are divided into three cases -- Shenzhen Zhongnuo Testing Technology Co., Ltd.
1. Explosion-proof certificate system
Applicable Products: Electrical and non-electrical equipment used in places with explosive gases and dust, excluding those for mining purposes (except for products listed in the Explosion-proof 3C catalog).
Certification Model: Product Testing
Certification Certificate: Explosion-Proof Compliance Certificate
Certificate Validity: 5 years
Annual Audit Required: No
2. Explosion-proof 3C Certification System
Applicable Products: Electrical Equipment listed in the Explosion-Proof 3C Catalog
Certification Mode: Combination of Type Testing and Factory Audit
Certification Certificate: CCC Certificate
Certificate Validity: 5 years
Whether Annual Audit: Audited Annually
3. Coal Safety/Mining Safety Certification System
Applicable Products: Various electrical and non-electrical equipment for use in both coal and non-coal mines underground
Certification Mode: Combination of Type Testing and Factory Audit
Certification Certificate: Mine Product Safety Mark Certificate
Certificate Validity: 5 years
Annual Audit Required: Yes, annual audit is required

Which certifications are the explosion-proof ATEX and IECEx certifications from?
ATEX certification is a mandatory certification for explosion-proof products in the EU, part of the CE certification's explosion protection directive, applicable to the EU and its regions.
IECEx is the International Electrotechnical Commission's explosion-proof electrical products certification system, which is voluntary and applicable to member countries of the IECEx scheme.
Most major economic powers globally are members of the IECEx system, including China.
In regards to IECEx and ATEX certifications, ZN Testing has summarized the following distinctions:
(1) Applicability: ATEX certification is applicable in the EU region, while IECEx certification is applicable to IECEx member countries.
(2) Whether mandatory, ATEX certification is mandatory, while IECEx is voluntary.
(3) Execution Standards: ATEX certification standards are IEC 60079 series, IECEx certification standards are IEC 60079 series.
(4) Explosion-proof markings, the ATEX explosion-proof markings are more complex than the IECEx certification markings. You can see this clearly by looking at the examples we have provided.
(5) Conversion issues: Currently, ATEX certification cannot be converted to other certificates outside the EU. IECEx member states recognize IECEx certificates directly or indirectly, such as Australia and New Zealand, which directly recognize IECEx certificates. Other IECEx member states (like China) can convert their IECEx certificates into local explosion-proof certificates.
For more information on ATEX certification and IECEx certification, feel free to send us a private message at any time!

What are the markings on explosion-proof electrical equipment?
A complete explosion-proof marking includes:
Ex Mark
Explosion-proof type
Gas/Dust Combination
Temperature Group
Equipment Protection Level
Ex db ib IIc T4 Gb
Ex tb ⅢC T130°C Db
For more information, please contact Shenzhen Zhongnuo Inspection & Technology Co., Ltd.!
Explosion-proof Certification Application Consulting Service - Shenzhen ZhongNuo Testing Technology Co., Ltd.