Zone 0
An area in which an explosive gas/air mixture is continuously present,
or present for long periods. Explosive atmosphere Present continuously
>1000hrs/annum.
Zone1
An area in which an explosive gas/ air mixture is likely to occur
in the normal operation of the plant. Explosive atmosphere Present intermittently
>10 <1000Hrs/annum.
Zone 2
An area in which an explosive gas/ air mixture is not likely to occur in normal operation and if it is occurs, it is only for a short period of time. Explosive atmosphere present abnormally <10 hrs / annum.
An area in which an explosive gas/ air mixture is not likely to occur in normal operation and if it is occurs, it is only for a short period of time. Explosive atmosphere present abnormally <10 hrs / annum.
Zone20
An area in which a combustible dust, as a cloud, is present continuously or frequently during normal operations in sufficient quantities to produce an explosive mixture.
An area in which a combustible dust, as a cloud, is present continuously or frequently during normal operations in sufficient quantities to produce an explosive mixture.
Zone 21
An area in which a combustible dust, as a cloud,
is likely to occur during normal operations in sufficient quantities to produce
an explosive mixture.
Zone 22
An area in which combustible dust clouds may occur infrequently and persist for only short periods of time or in which accumulations or layers may be present under abnormal conditions.
An area in which combustible dust clouds may occur infrequently and persist for only short periods of time or in which accumulations or layers may be present under abnormal conditions.
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