Zones

Zones

Hazardous Areas are classified into zones based upon the frequency of the occurrence and duration of an explosive Gas or combustible dust Atmosphere , namely ZONE 0, ZONE1, ZONE2 (for Explosive Gas Atmosphere ) and ZONE20, ZONE21, ZONE22 (for Combustible Dust Atmosphere )

Zone 0 (Zero)

That area in which Explosive Gas Atmosphere , consisting of a mixture with air of Flammable substance in the form of gas, vapor or mist is present continuously or for long periods or frequency.

Zone 1

That area in which an Explosive Gas Atmosphere , consisting of a mixture with air of Flammable substance in the form of gas, vapor or mist is likely to occur in normal operation occasionally.

Zone 2

That area in which an Explosive Gas Atmosphere , consisting of a mixture with air of Flammable substance in the form of gas, vapor or mist is not likely to occur in normal operation but, if it does occur , will persist for a short period only.

Zone 20 (IEC 60079-14)

Place in which an explosive atmosphere in the form of a CLOUD of combustible dust in AIR is present continuously or for long periods or frequency

Zone 21

Place in which an explosive atmosphere in the form of a CLOUD of combustible dust in AIR is likely to occur , occasionally, in normal operation.

Zone 22

Place in which an explosive atmosphere in the form of a CLOUD of combustible dust in AIR is NOT likely to occur in normal operation but , if it does occur, will persist for a short period only