1) Zone ) ( ATEX category 1G {Gas} ) A place in which an explosive atmosphere consisting of a mixture with air of flammable substance in the form of gas , vapour or mist is present continuously or for long periods or frequently .
2) Zone 1 ( ATEX category 2 G {Gas}) A place in which an explosive atmosphere consisting of a mixture with air of flammable substances in the form of a gas , vapour or mist is likely to occur in normal operation occasionally .
3) Zone 2 ( ATEX category 3G {Gas}) A place in which an explosive atmosphere consisitng of a mixture with air of flammable substance in the form of gas vapour or mist is not likely to occur in normal operation but , if it does occur , will persist for a short period olny .
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