Explosion protection is about competence in engineering and not about the limitation(s).
You shall choose the right protection method(s) and follow all to-do-s related. And it works lifetime long.
Functionality is an important issue, but it always has to be Ex in any possible hazardous environment.
Keep up good work!
Arpad
Question How should equipment be marked with new Type of Protection designations
a cut out from iec 60079 10 1 : 2020 “Once a
Let me give you an example. ATEX 137 – Directive 99/92/EC –
Normal operation Means situations when an installation is used within its design
arpadveress 
