Ex c,b,k = Ex h (non-electrical explosion protection)

According to ISO 80079-37:2016 there is only one marking possible: Ex h for Ex non electrical devices.
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The symbol “X” is used to provide a means of identifying essential

“in some cases a zone of negligible extent (NE) may arise and

Is there any difference if it comes from an Ex repair facility

Ambient temperature range Ex manufacturers apply -20°C to + 40°C as a