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Gas Groups
Temperature Classes
Types of Protection
What to Use Where
Atex Directive
Atex Grouping
Atex Approval
Notified Bodies
Atex Marking
Atex Label





Hazardous Area Zones  -  Risk Frequency

A hazardous area is any area where an explosive atmosphere may occur at any time.
Such locations are divided according to the likelihood of an explosive atmosphere as follows:

Zone 0
is an area where an explosive atmosphere is present continuously or for long periods.

Zone 1 is an area where an explosive atmosphere is likely to exist in normal circumstances.

Zone 2 is an area where an explosive atmosphere is not likely in normal operation, & if it occurs, it will only exist for a short time.



The requirements for an explosion are:

A Flammable Vapour

Availability of Oxygen

A source of ignition



This illustrates a typical example of how Hazardous Areas are classified.