Hazardous Area Classification
Hazardous Area Classification
| Zone | Description |
| Zone 0 | Where ignitable concentrations of flammable gases, vapors, or liquids are present continuously or for long periods of time under normal operating conditions. |
| Zone 1 | Where ignitable concentrations of flammable gases, vapors, or liquids are likely to exist under normal operating conditions. |
| Zone 2 | Where ignitable concentrations of flammable gases, vapors, or liquids can occur for only a short period of time. |
| Zone 20 | Where explosive atmosphere in the form of a cloud of combustible dust in air is present continuously, or for long periods or frequently |
| Zone 21 | Where explosive atmosphere in the form of a cloud of combustible dust in air is likely to occur, occasionally, in normal operation. |
| Zone 22 | Where explosive atmosphere in the form of a cloud of combustible dust in air is not likely to occur in normal operation but, if it does occur, will persist for a short period only. |
[Areas classification example]
| Condition | IEC | NEC500 | JIS, KS |
| Continuous hazard (more than 1,000 hours per year) |
Zone 0 Zone 20(DUST) |
Division 1 | Zone 0 |
| Intermittent hazard (10-1,000 hours per year) |
Zone 1 Zone 21(DUST) |
Division 1 | Zone 1 |
| Possible hazard (0.1-10 hours per year) |
Zone 2 Zone 22(DUST) |
Division 2 | Zone 2 |
Models Available for Each Zone
* ZONE 1 and ZONE 21 products can be used in ZONE 2 and ZONE 22, respectively.
Zone 1, 2
Translucent
Zone 2
Zone 2
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