ATEX protection types

ATEX protection types

Types of Common and Widely Used Protections for ATEX Certification

Types of Common and Widely Used Protections for ATEX Certification

1. Explosion protection type: Equipment protection by flameproof enclosure

  • Protection acronym: Exd

  • Symbol:

  • Related explosive zone: 0,1,2

  • Related explosive category: 1,2,3

  • Relevant standard: EN 60079-1

  • Protection conditions and requirements: the enclosure is mechanically designed to withstand a gas explosion inside without rupturing. Additionally, if a combustion occurs inside the enclosure, the resulting flame is quenched upon passing through the surfaces and gaps between the door and body, preventing ignition outside.

2. Explosion protection type: Equipment protection by increased safety

  • Protection acronym: Exe

  • Symbol:

  • Related explosive zone: 1,2

  • Related explosive category: 2,3

  • Relevant standard: EN 60079-7

  • Protection conditions and requirements: A doubly protected enclosure implies that the enclosure has a safe cable entry design, sufficient impact resistance, appropriate spacing between electrical and non-electrical parts, and high-quality sealing gaskets to maintain the required IP rating.

 3. Explosion protection type: Equipment protection by intrinsic safety

  • Protection acronym: Exi

  • Symbol:

  • Related explosive zone: 0,1,2

  • Related explosive category: 1,2,3

  • Relevant standard: EN 60079-11

  • Protection conditions and requirements: Electrical, electronic, and telecommunications equipment that, under normal operating conditions by means of special design, does not self-ignite due to low energy consumption.

 4. Explosion protection type: Equipment protection by pressurized enclosure

  • Protection acronym: Exp

  • Symbol:

  • Related explosive zone: 1,2

  • Related explosive category: 2,3

  • Relevant standard: EN 60079-2

  • Protection conditions and requirements:Electrical equipment inside the enclosure is protected by increasing the air pressure inside compared to the outside air pressure, which prevents flammable gases from entering the enclosure.

 5. Explosion protection type: Equipment protection by encapsulation

  • Protection acronym: Exm

  • Symbol:

  • Related explosive zone: 1,2

  • Related explosive category: 2,3

  • Relevant standard: EN 60079-18

  • Protection conditions and requirements: electrical and sparking components are encapsulated in a standard, and non-flammable compound that eventually transforms into a solid resin, preventing ignition of surrounding flammable gases by sparks or heat generated by these components.

 6. Explosion protection type: Equipment protection by oil immersion

  • Protection acronym: Exo

  • Symbol:

  • Related explosive zone: 1,2

  • Related explosive category: 2,3

  • Relevant standard: EN 60079-6

  • Protection conditions and requirements: the electrical equipment inside the enclosure is immersed in the non-flammable protective liquid and as a result, the spark or heat created by such equipment will not have the possibility of igniting the surrounding flammable gases.

  7. Explosion protection type

  • Protection acronym: Exq

  • Symbol:

  • Related explosive zone: 1,2

  • Related explosive category: 2,3

  • Relevant standard: EN 60079-5

  • Protection conditions and requirements: sparking electrical components are placed within a powder that can extinguish sparks. A simple example of this is a powder cylindrical fuse that are filled with silica powder that in case of occurring arc of protective cable inside silica powder that it extinguishes during a short circuit.

  8. Explosion protection type: Protection of electrical equipment by non-sparking design

  • Protection acronym: Ex nA

  • Symbol:

  • Related explosive zone: 2

  • Related explosive category: 3

  • Relevant standard: EN 60079-15

  • Protection conditions and requirements: Protection by preventing the generation of electric arcs, sparks, or excessive heat to minimize the risk of explosion.

 9. Explosion protection type: Protection of sparking electrical equipment

  • Protection acronym: Ex nC

  • Symbol:

  • Related explosive zone: 2

  • Related explosive category: 3

  • Relevant standard: EN 60079-15

  • Protection conditions and requirements: Protection through various techniques to prevent contact between flammable materials and sparking components.

  10. Explosion protection type: Protection related to restricted-breathing enclosures

  • Protection acronym: Ex nR

  • Symbol:

  • Related explosive zone: 2

  • Related explosive category: 3

  • Relevant standard: EN 60079-15

  • Protection conditions and requirements: Protection by limiting power dissipation and, consequently, the temperature difference between the device and its surroundings.the device must be equipped with a special connection that controls breathing properties.

 11. Explosion protection type: Equipment protection against flammable dust

  • Protection acronym: Ext

  • Symbol:

  • Related explosive zone: 20,21,22

  • Related explosive category: M1,M2

  • Relevant standard: EN 60079-31

  • Protection conditions and requirements: the enclosure is designed to maintain integrity of sealing gasket, ensuring at least an IP5X protection rating against the ingress of flammable dust to protect the internal electrical components.

 12. Explosion protection type: electrical installations (assemblies) in, or associated with, explosive atmospheres

  • Relevant standard: EN 60079-14

  • Protection conditions and requirements: for the electrical explosion proof assemblies, which are a combination of assembled Ex devices, each of the equipment used having an ATEX certificate, based on its relevant type of protection.

 13. Explosion protection type: non-electrical equipment for explosive atmospheres

  • Protection acronym: Exh

  • Symbol:

  • Related explosive zone: 0,1,2,20,21,22

  • Related explosive category: 1,2,3,M1,M2

  • Relevant standard: EN ISO 80079-36 , EN ISO 80079-37

  • Protection conditions and requirements: The design and configuration of mechanical equipment and components for explosion-proof applications in this type of protection are based on one of the following design methods: safe enclosure (C), explosion containment (b), or oil immersion (k).

 14. Explosion protection type: equipment protection by pressurized room (p) and artificially ventilated room (v)

  • Protection acronym: Exp , Exv

  • Symbol:

  • Related explosive zone: 1,2

  • Related explosive category: 2,3

  • Relevant standard: EN 60079-13

  • Protection conditions and requirements: creating p-type protection is realized by increasing the air pressure inside the enclosure of equipment, therefore flammable gases are prevented of entering the enclosure. for type v protection, artificial ventilation method is used to dilute flammable gases.

15. Explosion protection type: protection of equipment and transmission systems using optical radiation

  • Protection acronym: Ex op

  • Related explosive zone: 0,1,2

  • Related explosive category: 1,2,3

  • Relevant standard: EN 60079-28

  • Protection conditions and requirements: light sources, electromagnetic waves, or radio waves are designed and arranged to prevent the concentration of light or waves at a single point and their conversion into another form of energy, such as heat.

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