After 5 years of working as EEHA (Electrical equipment in hazardous areas) inspector, I can definitely say the Ex knowledge not only mandatory as a type of quality assurance, it is also vital for preventing future breakdowns and catastrophic failures
From 2003 I work for Miretti Company leader in Explosionproof protections, I'm an expert of the certification process and regulations for European, USA, Canada, IECEx, CNEx , and EAC market. With my experience I have increased the research and development capacity of new Ex products/solutions.
I am a professional electrical engineer with around 45 years of OG and related project design and management experiences acquired internationally on 3 continents and numerous countries. I used to be live in Hungary (my native country) South Africa, New Zealand, Australia, Abu Dhabi UAE and Thailand