1.1.15 What does the designation “flameproof enclosure” mean for ATEX motors?

Type of protection – flameproof enclosure “d”

Building regulation: EN 60079-1:2007 (VDE 0170-5) Definition:
A type of protection in which the parts capable of igniting an explosive atmosphere are placed in an enclosure which, in the event of an explosion of an explosive mixture inside, withstands its pressure and prevents the transmission of the explosion to the explosive atmosphere surrounding the enclosure.