Transcription of Chapter 12 Ex Protection Concepts
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Chapter 12 Ex Protection Concepts
Session 12 Ex Protection ConceptsEx Protection ConceptsElectricalElectrical Symbol Typical IEC EPLT ypical Zones IEC Standard Basic concept of protectionIncreased safety e Gb 1,2 IEC 60079 7 No arcs, sparks or hot surfaces. Enclosure IP54 or betterType n (non sparking) nA Gc2 IEC 60079 15 Flameproofd Gb 1,2 IEC 60079 1 Contain the explosion , quench the flameType n (enclosed break) nC Gc2 IEC 60079 15 Quartz/sand filled q Gb 1,2 IEC 60079 5 Quench the flameIntrinsic safety ia Ga 0,1,2 IEC 60079 11 Limit the energy of sparks and surface temperaturesIntrinsic safety ib Gb 1,2 IEC 60079 11 Intrinsic safety ic Gc2 IEC 60079 11 Type n (energy limitation)
Difference between Flameproof & Explosion proof boxes • Enclosure must have recessed screws or bolts for access • 1.5 safety factor vs. 4 times • Typically must be machined and fabricated at the factory vs. the field • Most Ex ‘d’ enclosures individually tested Flameproof vs. Explosion Proof
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