In May 2020, the next (already third) edition of the guide to Directive 2014/34 / EU (ATEX) was published. The guide is a very useful document. It not only gives interpretations of individual provisions of the Directive but is also a binding interpretation of the proceedings of notified bodies. If you are a producer and want to get support in contact with NB, you will find them in the guide. 
Are you wondering what documents NB issues, what NB is obliged to attach to the certificate, who owns the test results, can NB use the manufacturer’s own test? Answers to these questions (binding answers) are in the Guide.