Our common principals manufacture various "flameproof" Exd Enclosures to be used in hazardous area applications.
The "flameproof" type protection 'Ex d' is based on the principle that electrical components which may cause sparks
or arcing in normal operation (switches, contactors etc.) are in an enclosure constructed so that it will contain
an explosion of flammable gas or vapour and will not permit ignition of a surrounding explosive atmosphere. Further,
the temperature of the outside surface of the enclosures must not exceed the prescribed temperature limit for the
appropriate temperature class. That means, the heat loss from the components fitted must not exceed a specified value.