Correct Scotty, dates from a document drafted in1984, I was involved in a small way. It went on to be released as EN 60079-19.
I do not think that approval is a legal requirement, but AEMT do offer an approval service, which approves the management, I do not think it is a test house for the repaired motor or device.
Krysis, which country are you in, since this will probably affect the requirements.