The appropriate explosion protection concept is determined by the product design, intended application, type of ignition source, hazardous area classification, and the applicable requirements of the IEC 60079 series of standards.

Ex d (Flameproof Enclosure) is one of several recognized protection concepts and is typically used for equipment designed to contain an internal explosion and prevent the ignition of the surrounding explosive atmosphere. Other protection concepts, such as Ex e, Ex i, Ex p, Ex m, or Ex n, may be more appropriate depending on the product’s function and operating environment.

A technical assessment is normally carried out at the beginning of the project to identify the most suitable protection concept and determine the applicable testing and certification requirements. This helps ensure that the conformity assessment is aligned with both the intended use of the equipment and the relevant ATEX or IECEx requirements.

To begin an Ex d assessment, manufacturers should provide sufficient technical information to enable evaluation of the equipment design and the applicable explosion protection requirements.

Typical documentation includes a product description, intended use, hazardous area classification, explosion protection concept, design drawings, enclosure details, electrical schematics, bill of materials, component specifications, and available test reports or certificates. Information on operating conditions, temperature class, equipment group, and intended gas atmosphere may also be required.

The exact documentation depends on the product type and stage of development. An initial technical review helps identify the applicable standards, confirm the testing scope, and determine whether any additional information or design modifications are required before testing begins.

The number of samples required for Ex d testing depends on the type of equipment, its design, size, protection concept, and the scope of testing to be performed.

In many cases, multiple samples are needed to complete the full test program, as different tests may be destructive and cannot always be performed on the same unit. Additional samples may also be required if the equipment includes different configurations, product variants, or interchangeable components.

The exact sample quantity is determined during the technical review based on the applicable IEC 60079 standards, the certification scope, and the planned testing program. Manufacturers are typically advised of the required number of samples before testing begins.

Yes, in many cases multiple enclosure variants can be included within a single project, provided they belong to the same product family and share the same fundamental design and explosion protection concept.

The feasibility of covering multiple variants depends on factors such as enclosure dimensions, materials, flamepath design, wall thickness, fastening arrangements, and other features that may affect explosion protection performance. Variants with significant design differences may require additional testing or separate evaluation.

A technical review is carried out at the start of the project to determine which enclosure variants can be included within the same testing and certification scope and whether any additional assessment is necessary.

If the product does not successfully pass Ex d testing, the test results are reviewed to identify the specific non-conformities and their underlying causes.

A detailed technical report is provided, outlining the findings and the requirements that were not met. Based on these results, design modifications, material changes, or engineering improvements may be recommended to address the identified issues.

Once the necessary corrective actions have been implemented, the product can be re-evaluated and, where required, the relevant tests repeated. The objective is to achieve compliance with the applicable IEC 60079 standards and the relevant ATEX or IECEx certification requirements.