Zone 0

Zone 1

Zone 2

A place where the explosive atmosphere of flammable gas is present continously or for a period of frequently

A place where the explosive atmosphere of flammable gas is likely to occur in normal operation occasionally

A place where the explosive atmosphere of flammable gas is not likely to occur in normal operation, but if it does occur it will only be present for a short period

Zone 20

Zone 21

Zone 22

A place where an explosive dust atmosphere is present continuosly or for a long period of time

A place where an explosive dust atmosphere is likely to occur during normal operation

A place where an explosive dust atmosphere is not likely to occur during normal operation, but if it does occur it will be present for a short period