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Hazardous areas are classified into zones based on an assessment of the frequency of the occurrence and duration of an explosive gas atmosphere, as follows:
  • Zone 0: An area in which an explosive gas atmosphere is present continuously or for long periods;
  • Zone 1: An area in which an explosive gas atmosphere is likely to occur in normal operation;
  • Zone 2: An area in which an explosive gas atmosphere is not likely to occur in normal operation and, if it occurs, will only exist for a short time.
See also – ‘Area Classification’ and ‘Hazardous Area
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