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Protection relaxed version of other methods
Application: Zone 2 lights, motors junction boxes etc

Supplementary marking requirements for apparatus producing arcs, sparks or hot surfaces.

Non sparking     Ex nA
Restricted breathing   Ex nR
Simplified pressurization  Ex pz
Energy limiting apparatus  Ex nL (i.c.)
Sealed or encapsulated device Ex nC
Enclosed break     Ex nC  
Hermetically sealed    Ex nC

 
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