We have received too many times this simple question from customers all over the world. Few remarks here:

- Ex as a legal system shall not be chosen by company, but it shall come from country's legislation

- if this does not work, company shall come to decision. And this decision shall be followed in all cases

Note: it does not work, that for one application I choose the most applicable one, and I do choose sg different for the next one.

Keep up good work!

Eg.: ATEX, IECEX...