< HAZARDOUS INFORMATION < European standard
 
Type of protection Method of protection CENELEC designation
Flameproof enclosure Containment 'd'
Increased safety Mechanical 'e'
Intrinsically Electrical 'i'
 

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
 
- Explosion group
Group I Electrical equipment for mining application
Group II Electrical equipment for all remaining hazardous area