Custom Engineered Panel — ATEX / IECEx Certification Compliance
ATEX / IECEx Certification compliance requirements, testing procedures, and design considerations for Custom Engineered Panel assemblies.
Custom Engineered Panel assemblies intended for hazardous areas must be designed and verified under the ATEX and IECEx framework before they can be placed into service. In practice, this means the panel architecture, enclosure selection, internal segregation, component temperature rise, and wiring methods must be evaluated against the applicable protection concept and the declared equipment group and temperature class. For electrical control panels and distribution assemblies, the most relevant product safety references include IEC 61439-1 and IEC 61439-2 for low-voltage switchgear and controlgear assemblies, IEC 60079 series for explosive atmospheres, and IEC 61641 for arc fault containment where fault energy management is part of the design basis. Component-level compliance still depends on IEC 60947 for devices such as ACBs, MCCBs, contactors, overload relays, motor protection switches, protection relays, VFDs, and soft starters selected for the enclosure. A compliant hazardous-area panel is not simply a standard industrial board fitted with Ex-rated labels. The design must ensure that all installed equipment is appropriate for the zone classification, typically Zone 1 or Zone 2 for gas atmospheres and Zone 21 or Zone 22 for dust atmospheres, with protection methods such as Ex d, Ex e, Ex p, Ex i, Ex n, Ex t, or combinations thereof. The maximum surface temperature of internal and external components must remain below the ignition temperature margin defined by the certified temperature class, commonly T1 through T6. Cable entries, glands, terminals, and earthing must be specified to maintain the integrity of the protection concept and the enclosure degree of protection, often IP54 to IP66 depending on the environment. From a construction standpoint, engineers must control wiring routes, clearances, creepage distances, and the thermal loading of devices operating at rated currents from a few amperes up to several thousand amperes. If the panel contains a 2500 A busbar system, for example, the short-circuit withstand rating, conditional short-circuit current, and internal arc consequences must be verified and documented. Forms of separation in accordance with IEC 61439-2, such as Form 2b, Form 3b, or Form 4, may be used to improve maintainability and reduce the spread of faults, but they must be coordinated with the hazardous-area protection strategy. In control sections, intrinsically safe circuits must remain segregated from non-IS circuits with clearly defined wiring practices, blue identification, and appropriate barriers or isolators. Certification deliverables typically include the technical file, risk assessment, equipment schedule, routine test records, thermal calculations, and evidence of verification by design and by testing. For IECEx, the route may involve a certified Ex component or subsystem strategy, while ATEX conformity in the EU also requires the correct conformity assessment route, marking, and declaration. Routine inspection and maintenance remain essential after commissioning because gasket integrity, gland tightening, corrosion, and unauthorized modifications can invalidate compliance. Patrion, based in Turkey, supports engineering, fabrication, and documentation of Custom Engineered Panel solutions for hazardous industrial sites such as petrochemical plants, tank farms, FPSO modules, grain handling facilities, wastewater plants, and battery rooms where explosive atmospheres or flammable dusts are a credible risk. Properly engineered, the panel becomes a verified part of the site’s overall explosion protection strategy rather than a generic enclosure with a certificate attached.
Key Features
- ATEX / IECEx Certification compliance pathway for Custom Engineered Panel
- Design verification and testing requirements
- Documentation and certification procedures
- Component selection for standard compliance
- Ongoing compliance maintenance and re-certification
Specifications
| Panel Type | Custom Engineered Panel |
| Standard | ATEX / IECEx Certification |
| Compliance | Design verified |
| Certification | Available on request |
Frequently Asked Questions
What is required for a Custom Engineered Panel to comply with ATEX and IECEx?
Compliance requires the panel to match the hazardous-area classification, protection concept, and temperature class of the installation. For a Custom Engineered Panel, this usually means verified enclosure selection, approved cable entry systems, correct segregation of circuits, documented thermal performance, and suitable components certified or assessed under IEC 60079 and IEC 60947. If the assembly functions as low-voltage switchgear or controlgear, IEC 61439-1 and IEC 61439-2 verification is also required. The final deliverable should include the technical file, routine test records, installation instructions, and the applicable ATEX or IECEx marking and declaration. In practice, the compliance path depends on whether the panel is Ex d, Ex e, Ex p, Ex i, or Ex t based, and whether it will serve Zone 1, Zone 2, Zone 21, or Zone 22 locations.
Which IEC standards apply to ATEX / IECEx certified panel assemblies?
The core standards are IEC 60079 for explosive atmospheres and IEC 61439 for low-voltage assemblies. IEC 61439-1 covers general rules, while IEC 61439-2 applies to power switchgear and controlgear assemblies. If the assembly includes instrumentation or hazardous-area signal segregation, IEC 60079-11 and related intrinsic safety standards may apply. Where the panel incorporates industrial control devices, IEC 60947 is relevant for ACBs, MCCBs, contactors, motor starters, and protection relays. In some projects, IEC 61641 is used to evaluate internal arc fault behavior, especially for higher fault levels. The exact combination depends on the application, but a credible compliance package typically references all of these standards together rather than treating ATEX or IECEx as standalone labels.
Can VFDs and soft starters be used in ATEX / IECEx panels?
Yes, but only with careful engineering and product selection. VFDs and soft starters are common in hazardous-area related control panels for pumps, conveyors, fans, and process skids, but they must be assessed for temperature rise, harmonics, ventilation, and installation location. In many designs, the drive itself is installed in a safe area while motor circuits or field devices enter the hazardous zone through certified barriers or protected interfaces. If the drive is located inside the hazardous-area enclosure, the complete assembly must satisfy the relevant IEC 60079 protection concept and thermal limits. The drive manufacturer’s documentation, derating tables, EMC measures, and cooling requirements must be incorporated into the technical file and verification records.
How are short-circuit ratings verified for hazardous-area control panels?
Short-circuit performance is verified as part of the assembly design under IEC 61439, with the rated short-circuit withstand current, conditional short-circuit current, and protective device coordination clearly documented. For a Custom Engineered Panel, this means the busbars, terminals, devices, and protective apparatus such as ACBs and MCCBs must be selected to withstand the prospective fault current at the installation point. In some cases, manufacturer-tested combinations can be used; in others, calculation or comparison methods are acceptable if they are supported by the assembly standard. If internal arc risk is a concern, IEC 61641 testing or equivalent evidence may be requested. The result should be a declared rating that matches the real fault level of the site, not a nominal catalog value.
What documentation is needed for ATEX / IECEx certification of a panel?
A complete documentation set usually includes the general arrangement drawings, wiring schematics, bill of materials, component certificates, risk assessment, temperature calculations, wiring and gland schedules, verification and test reports, installation instructions, and the final declaration of conformity. For IECEx, the technical file must show how the enclosure, devices, and protection concept were evaluated against the applicable IEC 60079 parts. For ATEX, the file must also support the correct EU conformity assessment route and product marking. Routine verification records are essential because ATEX / IECEx compliance is not only a design issue; it also depends on the as-built build quality, enclosure integrity, and traceability of all critical parts used in the Custom Engineered Panel.
What is the difference between ATEX and IECEx for panel builders?
ATEX is the European regulatory framework for equipment intended for explosive atmospheres, while IECEx is the international certification scheme based on IEC standards. For panel builders, the technical design principles are similar because both rely on IEC 60079 and related product standards, but the conformity assessment and marking requirements differ. A panel may be engineered to meet both pathways if the build uses certified components, verified protection methods, and complete technical documentation. Many EPC contractors request IECEx for global projects and ATEX for EU installations. In practical terms, a well-prepared Custom Engineered Panel can often be configured to satisfy both, provided the design, testing, and paperwork are aligned from the start.
How do you maintain compliance after installation and commissioning?
Compliance must be preserved through periodic inspection, maintenance, and change control. Gland tightness, gasket condition, corrosion, dust ingress, terminal torque, and device substitutions should be checked during scheduled inspections. Any modification, such as adding an MCCB, changing a VFD, or rerouting wiring, can affect the original certification basis and may require re-verification. IEC 60079 inspection practices and site maintenance procedures should be followed, and the assembly should remain consistent with the original technical file. For industrial facilities, this is especially important in petrochemical, mining, and dust-handling applications where vibration, contamination, and thermal stress can degrade the protective functions of the Custom Engineered Panel over time.
Which industries commonly require ATEX / IECEx compliant custom panels?
Typical applications include oil and gas, petrochemical processing, tank farms, FPSOs, LNG facilities, chemical plants, grain handling, food processing with combustible dust, wastewater treatment, battery energy rooms, and pharmaceutical dust-handling areas. These sites often need a Custom Engineered Panel with verified protection concept, selective coordination, motor control, and safe integration of field instrumentation. Depending on the process, the panel may include ACBs, MCCBs, motor starters, protection relays, PLC interfaces, VFDs, or intrinsically safe barriers. The specific enclosure, ingress protection, and temperature class are selected to suit the zone classification and ambient conditions, making a project-specific engineering review essential before fabrication starts.