Dust Protection Enclosure Testing (Ex t)

Independent testing and technical evaluation of Ex t enclosures to support ATEX and IECEx conformity assessment for dust hazardous areas

Danem Test & Certificate provides Ex t testing and assessment services for manufacturers of equipment intended for use in combustible dust environments. Protection by enclosure focuses on preventing dust ingress and limiting external surface temperatures so the equipment remains safe under defined operating conditions.

We support clients from early feasibility reviews through test planning, sample readiness checks, and technical evaluations. Our approach is adapted to the enclosure design, intended installation, dust environment assumptions, and the target marking, helping manufacturers avoid late changes and repeated testing.

From the outset, we define a clear testing scope, documentation requirements, and expected timelines. This ensures a predictable path from initial assessment to test evidence suitable for certification.

What Is Dust Protection Enclosure Testing (Ex t)?

Dust protection by enclosure testing (Ex t) evaluates whether equipment enclosures provide an appropriate level of protection against dust ingress and whether temperature-related requirements are met for the intended dust hazardous area. Ex t assessment typically considers enclosure integrity, sealing methods, environmental conditions, and the equipment’s thermal performance under defined loads.

Testing and evaluation are commonly performed against internationally recognized requirements such as IEC/EN 60079-31, and results influence enclosure selection, sealing details, permissible installation conditions, and technical documentation used for conformity assessment and marking.

Typical Ex t products include enclosures for motors, control panels, junction boxes, lighting housings, instrumentation assemblies, and mechanical equipment intended for use in dust hazardous environments.

Ex t Testing Process

Our Ex t testing process is structured to keep requirements clear and reduce project risk.

1. Technical Review and Scope Definition

We review the product design and intended application to identify applicable IECEx standards, protection concepts, and certification requirements.

2. Testing and Documentation Assessment

Testing activities are coordinated as required, and technical documentation is assessed against IECEx criteria.

3. Certification Assessment

The conformity assessment is completed in accordance with IECEx rules, leading to issuance of the relevant IECEx certificates.

4. Certification Completion and Project Support

Once certification is completed, the product is ready for use in IECEx-recognized markets and international projects.

1. Technical review and scope definition

We review the product design, intended use, dust environment assumptions, and target marking to confirm the applicable requirements and test plan.

3. Laboratory testing and verification

Testing and evaluations are performed in line with the applicable requirements, generating objective evidence of compliance for the declared protection level.

2. Documentation and readiness check

We verify key design details, sealing approach, enclosure configuration, and required documentation to ensure the sample is ready for testing.

4. Reporting and certification support

We provide clear test results and technical outputs suitable for ATEX/IECEx conformity assessment and technical file preparation.

Planning Ex t Certification?

Discuss your enclosure design and testing scope with our technical experts.

Is Ex t testing always required?

Provide drawings, enclosure details and sealing approach, intended marking, ambient range, dust environment assumptions, and operating conditions. Early clarity on mounting orientation, cable entries, and service access points helps define the correct scope.

What information should we provide before starting Ex t testing?

Typical issues include insufficient creepage/clearance distances, unclear temperature rise justification, unsuitable terminals or components, and mismatches between documentation and the assembled product. Pre-checking the technical file and sample build reduces rework.

Can Ex t testing cover multiple enclosure sizes or variants?

Often yes, when variants share the same sealing concept and safety-critical features, and differences can be technically justified. The final approach depends on how changes affect ingress protection, thermal behavior, and installation conditions.

What changes to an Ex t product usually trigger re-testing or re-evaluation?

Changes that affect dust ingress or temperature typically require review. For example cable entries, sealing materials, enclosure joints, service covers, mounting orientation, power/heat dissipation, or declared ambient range. Even small design updates can impact compliance, so it is best to confirm scope before implementing changes.

Can we start Ex t evaluation before the enclosure design is final?

Yes. Early-stage technical reviews are recommended to confirm clearances, component selection, and temperature assumptions before committing to tooling or final production builds.