The converter/ EX proofing company who issues the new CE mark is fully responsible for the protection concept on the equipment. The end user is responsible for the correct use of the equipment within the classified area (correct use for the classification). The end user needs to periodically check the Zoning assessment and products in use in those areas. My company takes full responsibility under ATEX 95 for equipment supplied. We have to do this to keep our ATEX "license"