arpadveress 
Take care about the details. See the picture as whole… look at the standard mentioned on the label: EN 600079-15 (one 0 more)
Keep up good work!
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To make it simple and Ex
In a possible hazardous atmosphere only devices, equipments, power and working machines
milestoning of Ex projects
Title: sample Ex Compliance Engineering Transfer of information from client:– Existing HAC
The use of variable frequency drives in explosive atmospheres
Increased use of electronic motor drives adds complications to the use of
Prevention
Primary – Secondary – Tertiary explosion protection So far we can say
Simple but practicable