arpadveress 
According to ISO 80079-37:2016 there is only one marking possible: Ex h for Ex non electrical devices.
Keep up good work!
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Conventional Ex
You might get surprised that on the site you work for HOW
Manual
It is mandatory. It shall be with the product. It shall be
simplExcity
An industrial facility and a city itself there is not much difference.
How you mark the Ex zone?
All we know hazardous area classification is a must have. Question to
