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Guide For Hazardous Areas

Protection concepts IECEx and ATEX

The table below lists the types of protection methods and basic concepts of protection according to ATEX and IECEx standards for electrical equipment that is to be operated or installed in hazardous areas. The matrix is constructed to enable the fast cross referencing of protection concepts for zones and related equipment protection levels.
For definitions of hazardous zones, please see the E2S guide to hazardous areas as defined by IECEx, ATEX, NEC and CEC standards and directives.
A similar matrix of protection concepts can also be found for the US and Canadian standards here.

Electrical equipment for flammable gases and dust
Symbol Type of protection Basic concept of protection Suitable
for Zones
Typical
EPL
EN / IEC Standard
0 1 2 20 21 22 Ga Gb Gc Da Db Dc
e Increased safety No arcs, sparks or hot surfaces, enclosure IP54 or better








60079-7
n Type ‘n’ (non-sparking)









60079-15
Type ‘n’ (closed-break) Containment of the explosion











Type ‘n’ (sealed and hermetically sealed) Keep the flammable substances out











Type ‘n’ (restriced breathing)











d Flameproof Containment of the explosion











60079-1
q Powder filled Quenching of the flame











60079-5
ia Intrinsic safety Limitation of spark energy and surface temperatures











60079-11
ib











ic











px Pressurised enclosure Keep the flammable substances out











60079-2
py











pz











ma Encapsulation











60079-18
mb











mc











o Oil immersion











60079-6
Op pr Optical radiation Inherently safe, protected by shutdown











60079-28
Op sh











Op is











ta Dust ignition protection by enclosure Dust-tight enclosure











60079-31
tb











tc











pd Pressurised enclosure Keep the flammable substances out











61241-4













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