arpadveress 
All we know hazardous area classification is a must have.
Question to here: how you mark the Ex zone?
– ATEX says Ex mark shall be displayed?!
– painting on floor?
– signs?
– warnings?
– zone map in the hand?
Remarks:
– Ex only does not say which group and T class, so not easy to identify if the installation is good or not (meeting the EPL requirements)
Recommendation: besides the Ex mark E.g Zone 1 IIB T4 to display, and then all easy to follow up.
Keep up good work!
Arpad
