Ex-pert Electrical Technologies

Dynamic elaboration on the Art & Science of Hazardous Area Protection

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.

ZONES

Graphic presentation of gas zones

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

Graphic presentation of dust zones

IEC 60079-10-2 :8.2

Formation of ZONES (A simplified analysis )

expeltec.making of zones 1


expeltec.making of zones 2


expeltec.making of zones 3


expeltec.making of zones 4


expeltec.making of zones 5

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