Glossary of Terms: Z

Zone 0
An area where an explosive mixture is likely to be present at all times, under normal operating conditions.
Zone 1
An area where an explosive mixture is likely to occur in normal operation.
Zone 2
An area where an explosive mixture is not likely to occur in normal operation, and if it does it is only for short periods.
Zone
Area classification of a hazardous area (Zone 0, 1 or 2) that defines the length of time a hazard in present. Mainly used in Europe.