Explosion-proof equipment for hazardous locations must be certified by recognized testing organizations before installation. Three major certification systems govern global markets: UL (Underwriters Laboratories) for North America, ATEX for the EU, and IECEx for international applications. Understanding which certification is required for your jurisdiction, how to read equipment markings, and how to verify certifications before purchase is essential for legal compliance and operational safety. This guide covers all three systems, the standards behind them, and how to verify certifications in authoritative databases.
Certification Systems by Jurisdiction
| Jurisdiction | Required Certification | Applicable Standard | Issuing Body | Database |
|---|---|---|---|---|
| United States | UL listing (NEC-based) | UL 1203, UL 844, UL 698 | UL, FM, CSA, Intertek (ETL) | UL Product iQ (iq.ul.com) |
| Canada | CSA certification | CSA C22.2 No. 30/137/157 | CSA, UL (cUL mark) | CSA Group product search |
| European Union | ATEX CE marking | EN 60079 series (ATEX 2014/34/EU) | EU Notified Bodies (DEKRA, SGS, DNV, BV) | Notified Body certificate databases |
| United Kingdom | UKEX marking | UK-adopted EN 60079 series | UK Approved Bodies | UK National Measurement Office |
| Australia/NZ | IECEx or AS/NZS 60079 | AS/NZS 60079 series | SAI Global, ExCBs | iecex.iec.ch |
| Brazil | INMETRO/IECEx | ABNT NBR IEC 60079 series | INMETRO-accredited bodies | iecex.iec.ch |
| Japan | TIIS certification or IECEx | JIS C 60079 series | TIIS | TIIS database |
UL Certification: North American Standard
In the United States, equipment for hazardous locations is listed by Nationally Recognized Testing Laboratories (NRTLs) — organizations recognized by OSHA to test and certify equipment against ANSI/UL standards. The primary UL standards for explosion-proof equipment used in industrial surveillance and lighting:
- UL 1203: Explosion-Proof and Dust-Ignition-Proof Electrical Equipment for Hazardous (Classified) Locations — applies to cameras, junction boxes, conduit fittings, housing enclosures
- UL 844: Luminaires for Use in Hazardous (Classified) Locations — applies to all lighting fixtures
- UL 698: Industrial Control Equipment for Use in Hazardous (Classified) Locations — applies to control panels and I/O devices in hazardous areas
- UL 2225: Cables and Cable-Fittings for Hazardous (Classified) Locations — applies to cable assemblies used in classified areas
The UL listing must be verified in UL Product iQ at iq.ul.com. The listing shows the exact conditions of acceptability including Class, Division, Group, T-code, and any restrictions on installation (maximum ambient temperature, conduit entry requirements, etc.).
ATEX Certification: European Union
ATEX Directive 2014/34/EU requires that equipment for use in explosive atmospheres in EU member states carry CE marking issued by an EU Notified Body. The Notified Body assesses the equipment against the EN 60079 series of standards (Europe’s adoption of the IEC 60079 standards) and issues an EC-Type Examination Certificate.
ATEX Equipment Marking Format
ATEX-certified equipment bears a specific marking format: CE [Notified Body Number] Ex [Equipment Group] [Category] [Protection Type] [Gas Group] [Temperature Class] [EPL]
Example: II 2G Ex d IIB T4 Gb — Group II (surface industry), Category 2 (Zone 1/2), Gas atmosphere, flameproof, Gas Group IIB, T4 (135C max), Equipment Protection Level b (Zone 1).
Key EU Notified Bodies for ATEX Certification
| Notified Body | Country | Notified Body Number |
|---|---|---|
| DEKRA Certification | Germany | 0158 |
| Bureau Veritas | France | 0081 |
| SGS Fimko | Finland/global | 0598 |
| DNV | Norway/global | 0575 |
| TUV Rheinland | Germany | 0035 |
| INERIS | France | 0080 |
IECEx Certification: International Standard
IECEx is administered by the IEC (International Electrotechnical Commission) through ExCBs (IECEx Certification Bodies) located in participating countries. The technical requirements are identical to ATEX (both based on IEC 60079 series), but certification is issued by IECEx-certified bodies rather than EU Notified Bodies. IECEx certificates are searchable at iecex.iec.ch — the authoritative database for all IECEx-certified equipment worldwide.
Countries that accept IECEx certificates directly (often without additional national testing): Australia, South Africa, Brazil (via INMETRO), Singapore, South Korea, New Zealand, Malaysia, and many others. Note: IECEx acceptance varies by country and equipment category — verify local requirements for critical installations.
How to Verify Explosion-Proof Equipment Certification
- Identify the applicable certification system: Based on the installation country/jurisdiction (UL for US, ATEX for EU, IECEx for international)
- Get the manufacturer’s claimed certificate number: From the product datasheet or the marking on the equipment
- Search the authoritative database: UL Product iQ / CSA database / Notified Body records / iecex.iec.ch
- Verify the exact model number: Suffix variations may or may not be covered — verify the specific configuration
- Confirm the classification parameters: Class/Division/Group/T-code (UL) or Zone/Category/Gas Group/T-class (ATEX/IECEx) match the installation area
- Check certificate validity: Certificates can be suspended or withdrawn — verify current status in the database
See: ATEX vs. UL Explosion-Proof Camera Certifications | How to Verify Your Explosion-Proof Camera Is Still Certified | Hazardous Area Classification Glossary
Frequently Asked Questions
What is UL 844 certification?
UL 844 is the Underwriters Laboratories standard for luminaires (lighting fixtures) for hazardous locations, used in North American NEC-classified installations. For cameras and general electrical equipment, UL 1203 applies. Both standards require testing and listing with specific Class, Division, Group, and T-code parameters matching the installation area classification.
What is the difference between UL listing and ATEX certification?
UL listing is the North American certification using the NEC Class/Division/Group system. ATEX certification is the EU certification using the Zone/Category/Group system. They address the same hazard using different classification frameworks. Neither automatically satisfies the other’s jurisdiction — multinational operations require both UL and ATEX certifications on the same equipment.
What is IECEx certification?
IECEx is the international certification scheme managed by the IEC, accepted in Australia, South Africa, Brazil, Singapore, South Korea, and other participating countries. Technical requirements are identical to ATEX (both based on IEC 60079 series), but certificates are issued by IECEx certification bodies rather than EU Notified Bodies. Verify current IECEx certificates at iecex.iec.ch.
How do I verify explosion-proof equipment is genuinely certified?
Search the authoritative database for the applicable standard: UL Product iQ (iq.ul.com) for UL listings; the issuing Notified Body’s certificate database for ATEX; iecex.iec.ch for IECEx. Verify the exact model number and configuration. Physical markings on equipment can be falsified — database verification is the only authoritative check before installation.
Browse certified explosion-proof products: Explosion-Proof Camera Systems | Explosion-Proof LED Lighting
Related compliance guides: Class 1 Division 1 vs Division 2 | ATEX Zone Selection Guide | NEC vs ATEX Crosswalk | Maintenance Compliance Checklist
Need certified equipment with full documentation? Request an Industrial Quote — Veilux provides ATEX, IECEx, UL, and cUL certification packages for engineering submittals and AHJ review.