Intrinsic Safety (EExi): The available electrical
energy is kept at too low a level to ignite an explosive atmosphere even under
Flameproof (EExd): The enclosure is designed and
installed such that if a flammable mixture enters the enclosure and is ignited,
the enclosure will withstand the internal explosion without transmitting the
ignition to an explosive atmosphere outside the enclosure.
Pressurisation (EExp): The enclosure is maintained at
a pressure above the surrounding atmosphere using a protective gas thereby
excluding the explosive atmosphere.
Increased Safety (EExe): Additional measures are taken
to reduce the risk of excessive temperatures or other sources of ignition on
apparatus which does not produce arcs or sparks in normal service.
Encapsulation (EExm): Contact with the explosive
atmosphere is prevented by encapsulating the equipment in a solid epoxy resin.
Oil Immersion (EExo): Contact with the explosive
atmosphere is prevented by immersing the equipment in an oil bath.
Powder Filling (EExq): Contact with the explosive
atmosphere is prevented by encasing the equipment in an inert powder.
Non-Incendive (EExn): Enclosure are designed to
minimise the risk of mechanical damage and ingress of outside atmosphere.