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Buyers of explosion-proof motors ask the same certification questions again and again: Is ATEX or IECEx required? Do certificates expire? Can I repair a certified motor without losing its approval? This FAQ answers the most common certification questions with practical, standards-based guidance for hazardous-area purchases.
1. ATEX vs IECEx: Which One Do I Need?
ATEX (Directive 2014/34/EU) is mandatory for equipment placed on the EU/EEA market — equipment in a European hazardous area needs an ATEX EU-type examination certificate plus the CE mark with the Ex hexagon. IECEx is a voluntary international scheme whose Certificate of Conformity (CoC) is accepted in more than 60 countries through a single test report. For non-EU export projects, IECEx usually provides the broadest acceptance; for EU-bound equipment, ATEX is legally required.
See our CSA and C/US certified motor guide if your project targets North America.
2. Do Explosion-Proof Certificates Expire?
Most explosion-proof certificates have no fixed expiry date — but that does not mean they stay valid automatically:
| Scheme | Validity | Condition to stay valid |
| IECEx CoC | No expiry; status Current/Suspended/Cancelled | Maintain IECEx QAR, pass periodic surveillance audits (typically annual) |
| ATEX | Long-term, no fixed term | Annual factory quality audits (QAN) by the Notified Body |
| FM/UL (North America) | Long-term | Unannounced factory inspections (up to 4+ per year), annual fees |
Always check the certificate status on the issuing body's database, not just the issue date — a suspended certificate means the equipment should not be supplied as certified.
3. Can I Repair an Explosion-Proof Motor Without Losing Certification?
No. Repairs to flameproof (Ex d) motors must follow IEC 60079-19 and be performed by a facility certified for explosion-proof repair. Grinding or machining flameproof flanges changes the critical gap dimensions and voids the protection. For any repair, insist on approved parts and re-certification documentation.
4. How Do I Verify a Motor Is Genuinely Certified?
- Check the nameplate: protection type (e.g. Ex db IIB T4 Gb), gas group, temperature class, certificate number and Notified Body ID (ATEX)
- Cross-check the certificate number in the issuing body's public database (IECEx online CoC search, ATEX NB database)
- Request the test report (ExTR) and quality assessment report (QAR) from the supplier
- For China: verify CCC Ex certification for domestic hazardous-area use
5. Does Certification Cover My Specific Zone and Gas?
Not automatically. A certificate is only valid for the protection type, gas/dust group and temperature class stated on it. A motor certified Ex db IIB T4 Gb is suitable for Zone 1/Zone 2 with IIB gases up to T4 — but not for IIC gases or higher T-classes. Match the certificate to your site classification before purchasing. Our IIB vs IIC gas group guide explains the differences, and the IEC vs North American classification comparison helps with cross-border projects.
6. What About Compliance After Installation?
Certification covers design and manufacturing. Safe operation also depends on correct installation (IEC 60079-14), maintenance (IEC 60079-17) and repair (IEC 60079-19). Keep a complete documentation file: certificate, test report, instruction manual and inspection records.
Need Help Verifying a Motor or Certificate?
Send us your certificate number or nameplate data — our engineers can help you confirm compliance and match the right certified motor for your application. Browse the Wolong explosion-proof motor product range or contact us directly.
