| Ex-Info : Zone Classification (Gases, Vaours and Mists) |
| |
Zone 2
A place in which an explosive atmosphere consisting of a
mixture with air of flammable substances 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
only. |
Zone 0
A place in which an explosive atmosphere consisting of a
mixture with air of flammable substances in the form of gas,
vapour or mist is present continously or for long periods or
frequently. |
Zone 1
A place in which an explosive atmosphere consisting of a
mixture with air of flammable substances in the form of gas,
vapour or mist is likely to occur in normal operation
occasionally. |
 |
| Classification “Rule of Thumb” |
| Zone |
Ignitable Mixture Present |
| Zone 0 |
> 1000 Hours/Year |
| Zone 1 |
10 - 1000 Hours/Year |
| Zone 2 |
< 10 Hours/Year |
| Unclassified |
< 1 Hours/Year |
|
| Distance wise classification |
Upto 8 mtrs. Zone 1
Upto 16 mtrs. Zone 2 |