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Ex-Proof Certification China – Explosion-Proof Equipment Approval & Testing
Ensure your electrical equipment, instrumentation, and machinery gain Ex-proof certification to enter hazardous locations in China. Our remote team manages the entire CNEx type testing and application process, keeping your products compliant with China's GB explosion-proof standards.
📋 Request Free Ex-Proof ConsultationWhat Is Ex-Proof Certification?
Ex-proof certification (also known as CNEx or explosion-proof certification, 防爆认证) is a mandatory conformity assessment for electrical and mechanical equipment used in potentially explosive atmospheres in China. Regulated by CNCA and conducted by CNEx-accredited laboratories, this certification covers protection concepts such as flameproof (Ex d), intrinsic safety (Ex i), increased safety (Ex e), and more. Without a valid CNEx certificate, equipment cannot be legally installed or sold for use in hazardous zones in China.
Our explosion-proof certification service guides foreign manufacturers through the entire China Ex compliance journey. We coordinate testing at CNEx-accredited labs, prepare technical documentation including GA drawings and explosion protection manuals, and submit the application on your behalf. With TEK China, you can navigate the CNEx approval process without a local office.
Our Ex-Proof Certification Process
1. Hazardous Area & Equipment Classification
We evaluate your equipment's zone (0, 1, 2 or 20, 21, 22), gas group, and temperature class to define the exact Ex-proof testing scope and applicable GB standards.
2. Laboratory Testing at CNEx Lab
Your samples undergo rigorous explosion-proof testing at a CNEx-accredited lab. We track progress, resolve non-conformities, and keep you informed.
3. Documentation & Application Submission
We compile test reports, GA drawings, and explosion protection manuals, then submit the application to the Chinese certification body.
4. Certificate Issuance & Factory Inspection
Once approved, you receive your CNEx certificate. The certificate is valid for 5 years, and we assist with periodic factory inspections and renewals.
Products That Require Ex-Proof Certification
Any equipment that could become an ignition source in a hazardous area must have explosion-proof type approval. Common examples include:
- Electrical Equipment: motors, junction boxes, lighting fixtures, control panels
- Instrumentation & Sensors: pressure transmitters, temperature sensors, gas detectors
- Mechanical Equipment: pumps, valves, gearboxes, fans, compressors
- Intrinsically Safe Devices: handheld terminals, barriers, isolators
- Oil & Gas Equipment: wellhead equipment, analyzers, emergency shutdown systems
If your product already holds an ATEX or IECEx certificate, the CNEx certification path may be simplified. Contact us for a free Ex-proof assessment.
Documents Required for Ex-Proof Certification
To apply for Ex-proof certification, foreign manufacturers need to prepare (we assist with translation and documentation):
- Product technical specifications and explosion protection manual
- General arrangement (GA) drawings and assembly diagrams
- Existing ATEX, IECEx, or other international Ex certificates and test reports
- ISO 9001 quality management certificate (mandatory for Ex certification)
- Application form completed by our team
- Letter of authorization for TEK China as the Ex-proof applicant
Ex-Proof Certification Timeline & Cost
The typical explosion-proof certification process takes 10 to 16 weeks from sample submission to certificate issuance, depending on protection type complexity and lab availability. Products with valid ATEX or IECEx certificates may qualify for a faster track.
Cost factors include laboratory testing fees, factory inspection charges, and application fees. We provide a fixed-price proposal after evaluating your equipment — no surprises.
📋 Get your personalized Ex-proof quote: Contact us with your explosion-proof equipment details and receive a detailed fee breakdown within 24 hours.
Frequently Asked Questions About Ex-Proof Certification
What is Ex-proof certification and who needs it?
Ex-proof certification (CNEx) is mandatory for electrical or mechanical equipment used in hazardous areas with explosive atmospheres in China. Any product operating in zones 0, 1, 2 or 20, 21, 22 must obtain this approval before installation or sale.
How long does Ex-proof certification take?
The average timeline is 10 to 16 weeks, depending on the protection concept and lab schedule. We can advise on expedited options for urgent projects.
Can I use my ATEX or IECEx certificate to simplify CNEx?
Yes, if your product already holds a valid ATEX or IECEx certificate, the Chinese certification body can often leverage existing test data to reduce duplicate testing. We help verify feasibility.
Do I need a Chinese representative for Ex-proof?
Foreign manufacturers must appoint a Chinese representative to submit the application. TEK China acts as your legal agent throughout the CNEx process.
Is Ex-proof the same as CCC certification?
No. CCC is for general product safety, while Ex-proof is specifically for equipment in explosive atmospheres. Some explosion-proof products may require both certifications.
Latest Ex-Proof Certification Updates
Accelerate Your CNEx Application with IECEx Test Reports
April 25, 2026Learn how to leverage your existing IECEx test data to significantly reduce the time and cost of obtaining China explosion-proof certification.
Common Ex-Proof Application Mistakes and How to Avoid Them
March 30, 2026Incomplete GA drawings and incorrect temperature classification are top reasons for CNEx delays. Follow our checklist.
Contact Us
Get in touch with our team for inquiries, quotes, or more information about Ex-proof certification
Get In Touch
Have questions about Ex-proof certification, explosion-proof equipment testing, or hazardous area compliance? Our experts are here to help with any inquiries about CNEx application, testing requirements, or custom solutions for your equipment.
- +86 130 5270 9126
- info@tekzenvo.com
- 5-Fa Zhan Building,No.9 Office Area,Kai Fa Qu,Dalian ,Liaoning, China
- Monday - Friday: 9:00 AM - 6:00 PM (GMT+8)