These designations are typically preceded by Ex, the designation indicating and apparatus built to a European standard. - Classification of hazardous location |
GAS |
Zone 0 |
Explosive gas present continuously |
Zone 1 |
Explosive gas present occasionally under normal operating conditions |
Zone 2 |
Explosive gas present for short period |
DUST |
Zone 20 |
Explosive dust present continuously |
Zone 21 |
Explosive dust present occasionally under normal operating conditions |
Zone 22 |
Explosive dust present for short period |