Termin kolejnych targów
Device Category
The Device Category is determined depending on the corresponding potentially explosive Zone in which a device is to be used.
- Categories in Group I:
- M1: high degree of safety, safe even if two independent faults occur
- M2: high degree of safety
- Categories in Group II:
- 1 : very high degree of safety
- 2 : high degree of safety
- 3 : normal degree of safety
Device Category | Avoidance of effective sources of ignition | Degree of safety | Approved for Zone | Presence of potentially explosive atmosphere |
3 | In normal use | Normal | 2 | Seldom or for short periods |
2 | Including in the event of normal faults | High | 1, 2 | Occasionally |
1 | Including in the event of infrequent faults | Very high | 0, 1, 2 | For long periods, constantly or frequently |
As an example: For use in Zone 1 of Group II, a device must be used which belongs at least to Category 2, or preferably Cat.1.
