Application in Explosive Environments | • 7 |
Classifications meeting the NEC 500 |
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Ex-1.4.3 Temperature classes
Electrical components for explosive areas are differentiated by temperature classes:
Temperature classes | Maximum | Ignition temperature |
| surface temperature | of the combustible materials |
T1 | 450 °C | > 450 °C |
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T2 | 300 °C | > 300 °C ≤ 450 °C |
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T2A | 280 °C | > 280 °C ≤ 300 °C |
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T2B | 260 °C | > 260 °C ≤ 280 °C |
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T2C | 230 °C | >230 °C ≤ 260 °C |
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T2D | 215 °C | >215 °C ≤ 230 °C |
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T3 | 200 °C | >200 °C ≤ 215 °C |
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T3A | 180 °C | >180 °C ≤ 200 °C |
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T3B | 165 °C | >165 °C ≤ 180 °C |
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T3C | 160 °C | >160 °C ≤ 165 °C |
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T4 | 135 °C | >135 °C ≤ 160 °C |
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T4A | 120 °C | >120 °C ≤ 135 °C |
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T5 | 100 °C | >100 °C ≤ 120 °C |
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T6 | 85 °C | > 85 °C ≤ 100 °C |
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