- Ex d: is a type of protection in which the parts capable of igniting an explosive gas atmosphere are provided with an enclosure which can withstand the pressure of an explosion of the explosive mixture inside and prevents the transmission of the explosion to the explosive atmosphere surrounding the enclosure.
- Ex e: is a type of protection applied to electrical equipment in which additional measures are applied so as to give increased security against the possibility of excessive temperatures and of the occurrence of arcs and sparks in normal service or under specified abnormal conditions.’
- Ex i: assembly of interconnected items of electrical apparatus, described in a descriptive system document, in which the circuits or parts of circuits, intended to be used in an explosive atmosphere, are intrinsically safe circuits.
- Ex o: is a type of protection in which the electrical equipment or parts of the electrical equipment are immersed in a protective liquid in such a way that an explosive gas atmosphere, which may be above the liquid or outside the enclosure, cannot be ignited.
- Ex q: is a type of protection in which the parts capable of igniting an explosive gas atmosphere are fixed in position and completely surrounded by filling material to prevent the ignition of an external explosive atmosphere.
- Ex m: a type of protection whereby parts that are capable of igniting an explosive atmosphere by either sparking or heating are enclosed in a compound, in such a way that the explosive atmosphere cannot be ignited under operating or installation conditions.
- Ex n: type of protection applied to electrical equipment such that, in normal operation and in certain specified regular expected occurrences, it is not capable of igniting a surrounding explosive gas atmosphere.
- Ex op: is ‘Inherently safe optical radiation’, and limits the energy of the light beam, like Ex i with copper cables.
- Ex t: The enclosure is sealed so tight, that no combustible dust can enter. The surface temperature of the external enclosure is limited
- Ex p: technique of guarding against the ingress of the external atmosphere into an enclosure by maintaining a protective gas therein at a pressure above that of the external atmosphere
- Ex s: Type of protection ‘s’, special protection, is a type of protection that, by its nature, does not comply with the constructional or other requirements specified for equipment with established types of protection, but that nevertheless can be shown, where necessary by test, to be suitable for use in hazardous areas in prescribed zones.
- Ex p & v:
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- Pressurized room: room volume protected by pressurization and of sufficient size to permit the entry of a person who may occupy the room.
- Artificially ventilated room: room volume protected by artificial ventilation and of sufficient size to permit the entry of a person who may occupy the room.
