Hazardous Area Classifications
| Standard | Flammable Atmosphere Present Abnormally < 10 hrs/year |
Flammable Atmosphere Present Intermittently > 10 < 1000 hrs/year |
Flammable Atmosphere Present Continuously > 1000 hrs/year |
|
|---|---|---|---|---|
| IEC/CENELEC (Europe) | ||||
| Gas | IEC 60079-10-1 | Zone 2 | Zone 1 | Zone 0 |
| Dust | IEC 60079-10-2 | Zone 22 | Zone 21 | Zone 20 |
| North America | ||||
| NEC 505 Gas | NEC Article 505-5 | Zone 2 | Zone 1 | Zone 0 |
| NEC 500 Gas & Dust | NEC Article 500-3(c) | Division 2 | Division 1 | Division 1 |
