The ATEX Directive specifies that the respective Notified Bodies engaged in the conformity assessment of equipment intended for the use in explosive atmospheres have to meet regularly. VdTÜV is responsible for the content management and organisation of the ExNBG meetings.

The ExNB Group has to ensure that all Notified Bodies work with uniform guidelines. These guidelines are laid down in Clarification Sheets (CS) which are available on the website of the Technical Secretary of the ExNB Group.