arpadveress 
Source: LINK
Each and every country has it regulated, but might be under different title. Check yours!
Keep up good work!
Arpad
EX vs IEC / EU / GERMANY
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Ex design stage
what is more important in terms of hazardous area compliance than a good Ex design?!
what makes a good Ex design? why is it important? how to keep it up? who can do it?
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Ex operatives / technicians are linked directly to Ex designer and vice verse – what is IEC 60079-14 4.2 about?
See what IEC 60079-14 – Annex A (normative): Knowledge, skills and competencies
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