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The thematic network S2S is a European Community Project carried out in the "Competitive and Sustainable Growth" programme and funded in part by contract number G1RT-CT-2002-05092.
Zones for gases
Hazardous areas are classified into zones based upon the frequency of the occurrence and the duration of an explosive gas atmosphere, the following definitions are only applicable to equipment group II.
NOTE - Normal operation means the situation when installations are used within their design parameters.