IEC 60079-10-1 Annex F

Schematic approach to Classification of Hazardous Areas

IEC 60079 is concerned with the classification of areas where flammable gas or
vapour hazards could arise. The resulting classification is used as a basis to support the proper design of the installation, selection, installation, operation, inspection, maintenance and repair of equipment for use in hazardous areas. (IEC 60079-10-1)

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The Concept of Ex as in IEC60079-14

Gas Detection and IEC