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EX D FLAMEPROOF
Ex d or Flameproof means that an enclosure or junction box is manufactured and certified as explosion proof according to explosion protection concepts.

The Flameproof classification is a type of protection in which the parts that can ignite in an explosive atmosphere are placed within an enclosure that can withstand the force created and pressure developed during an internal explosion. Therefore if an explosion should occur inside of the enclosure, it will either be contained within or any escaping flames would be cooled by the flame path. This reduces the risk of igniting an external explosive atmosphere.

Other hazardous area equipment that can be designated as Ex d or flameproof, for example a flameproof cable gland, is designed in a way that it will maintain the Ex d integrity of any flameproof enclosure to which it is fitted.

This method of explosion protection also prevents the external hazardous atmosphere from entering the enclosure and coming into contact with equipment.

EX E INCREASED SAFETY
Increased Safety Ex e is an explosion protection concept applied to the installation to ensure increased security against the possibility of excessive temperatures and sparks from hazardous area electrical equipment. Equipment that normally causes sparks is excluded from use within this method of explosion protection.

‘Ex e’ means that an enclosure is constructed and certified as Explosion Protected according to the Increased Safety standard.

The intention of the Ex e Increased Safety standard is to provide an impact resistant enclosure for electrical equipment and also to ensure that the contents will not produce a spark, temperature or current creepage that could ignite the external flammable atmosphere in a hazardous area zone, location or workspace.

EX I INTRINSIC SAFETY
Ex i Intrinsic Safety is an explosion protection concept in which the electrical energy within the equipment is restricted to a level which is below that what may cause an ignition or to limit the heating of the surface of the hazardous area equipment.

There are two main sub types to Ex i Intrinsic Safety protection, these being “ia” and “ib”, used for the classification of equipment intended for use in hazardous area locations and explosive atmospheres.

Type “ia” Intrinsic Safety protection allows for the occurrence of two faults during operation; Type “ib” explosion protection allows for the occurrence of one fault during operation.

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