Many on the road who have many years of experience about industrial explosion protection. Refreshment of knowledge (both theoretical and practical) is a must have in any case.
Standards give advise within 5 years it shall happen. If you are part of a repair station even less, within 3 years.
Citation from IEC 60079-14:2013 4.5:
“Competency can be demonstrated in accordance with a training and assessment framework relevant to national regulations or standards or user requirements.”

ExAM makes it happen – new trend in the world of Ex personnel competency methodologies.
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