| Conditions and Subdivisions - For more information click on Zones
|
Marking on operating equipment
|
| Flammable Materials
|
Temporary behaviour of explosive atmosphere
|
Classification
of Hazardous Area
|
Group
(Dir 94/9/EC)
|
Category
(Dir 94/9/EC)
|
Group
(EN60079-0)
|
Protection Level (EN60079-0)
|
| Gases & vapours
|
Present continuously or for long periods or frequently
|
Zone0
|
II
|
1G
|
II
|
Ga
|
| Present occasionally in normal operation
|
Zone1
|
II
|
2G
|
II
|
Gb
|
Not likely to be present in normal operation
or will be short term only
|
Zone2
|
II
|
3G
|
II
|
Gc
|
| Dust
|
Continuously present in clouds, or present for long periods or frequently
|
Zone20
|
II
|
1D
|
III
|
Da
|
| Occasionally develops into a cloud during normal operation
|
Zone21
|
II
|
2D
|
III
|
Db
|
| Is not likely to develop into a cloud during normal operation or is short term only
|
Zone22
|
II
|
3D
|
III
|
Dc
|
