The CompEx Ex12 Design course was developed in 2011 with an industry working group to deliver a competency certificate to professional application design engineers to ensure they understand the risks of potentially explosive atmospheres and select the appropriate electrical equipment. The Ex12 course meets the competency requirements of IEC60079-14 for designers (design & selection).

The course consists of classroom-based theoretical training, individual exercises, group exercises, and written assignments.

Exercises contain scenarios where equipment selection, markings, and environmental protection is relevant. The course also includes the intrinsically safe system concept and associated calculations required to ensure a correct and safe installation is achieved.