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A very frequent enquiry to ATEC is about equipment certification with a large proportion on the topic of ‘X’ and ‘U’ certified equipment and if it is suitable for use in a specific application within a Classified Hazardous Area.
Note The symbol “X” is used to provide a means of identifying that essential information for the installation, use and maintenance of the equipment is contained within the certificate.
Only Ex “d” equipment having a complete certificate shall be installed. Ex “d” enclosures and components having only a component certificate, i.e. marked with a “U”, shall not be installed in the hazardous area unless as part of an assembly of components (now being referred to as equipment), when the components in the equipment are permitted by a full Ex certificate which may contain an “X” and the equipment label carries full Ex marking including temperature class.
Additional holes or modification to entries shall only be made into an Ex “d” enclosure by the manufacturer or an appropriately qualified certified service facility. Alteration of the internal components of the equipment is not permitted without re-evaluation of the equipment because conditions may be created inadvertently which lead to pressure piling, change in temperature class, or other such issues that may invalidate the certificate.