Motor Marking | European & IECEX classification | Definition of zone or division | North American classification |
Not Generally Used | Zone 0 (gases) | An area in which an explosive mixture is continuously present or present for long periods | Class I Division 1 (gases) |
Not Generally Used | Zone 20 (dusts) | Class II Division 1 (dusts) | |
2G | Zone 1 (gases) | An area in which an explosive mixture is likely to occur in normal operation | Class I Division 1 (gases) |
| 2D | Zone 21 (dusts) | Class II Division 1 (dusts) | |
3G | Zone 2 (gases) | An area in which an explosive mixture is not likely to occur in normal operation and if it occurs it will exist only for a short time | Class I Division 2 (gases) |
| 3D | Zone 22 (dusts) | Class II Division 2 (dusts) |