Flameproof ‘d’
Basic principles
Flameproof enclosures are intended for equipment, which produces arcs, sparks or hot surfaces that may be incendive
in normal operation or industrial components that cannot otherwise be made suitable for use in a hazardous area. The
surrounding explosive atmosphere can enter the enclosure and internal explosions are expected during the life of the
equipment. The enclosure therefore has to be strong enough not to fracture or distort under the pressures generated.
Any constructional joints in the enclosure are dimensioned such that they do not transmit the explosion from the inside
to the surrounding atmosphere. These are called flamepaths.
The equipment is designed according to EN 60079-1 and is suitable for gas group II, category 2.
Typical products are electric motors and actuators, luminaries, loudspeakers and switchgear.
The key design features are: