| Flammable Material Present Continually | Flammable Material Present Intermittently | Flammable Material Present Abnormally | |
|---|---|---|---|
| IEC/EU | Zone 0 | Zone 1 | Zone 2 |
| US NEC 500 | Division 1 | Division 2 | |
| US NEC 505 | Zone 0 | Zone 1 | Zone 2 |
| CA CEC Section 18 | Zone 0 | Zone 1 | Zone 2 |
| CA Annex J | Division 1 | Division 2 | |
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