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 < HAZARDOUS INFORMATION < Equipment group |
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| - Category of equipment |
| Category type |
Presence or duration of
explosive atmosphere |
Inflammable substances |
Level of protection faults to allow for |
Comparison with present practice |
| 1 |
Continuous presence long periodsfrequent |
Gas, Vapors,
Mist,
Dust |
Very high |
Group II
Zone 0 (gas)
Zone 20 (dust) |
| 2 |
Likely to occur |
Gas,
Vapors,
Mist,
Dust |
High level |
Group II
Zone 1 (gas)
Zone 21 (dust) |
| 3 |
Unlikely to occur present for short period |
Gas,
Vapors,
Mist.
Dust |
Normal |
Group II
Zone 2 (gas)
Zone 22 (dust) |
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