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
Is there any difference if it comes from an Ex repair facility
Article 13 Final provisions 1. Member States shall bring into force the
An engineer With relevant experience of explosion protection Electrical Mechanical Proven records
Care must be taken to limit the harmful effects of any explosion
arpadveress 
