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| Application in Explosive Environments | • 3 | |||
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| Classification meeting CENELEC and IEC |
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| Minimal ignition energy of representative types of gases |
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| Explosion group | I |
| IIA | IIB | IIC |
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| Gases | Methane |
| Propane | Ethylene | Hydrogen |
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| Ignition energy (µJ) | 280 |
| 250 | 82 | 16 |
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Hydrogen being commonly encountered in chemical plants, frequently the explosion group IIC is requested for maximum safety.
Ex-1.3.3 Unit categories
Moreover, the areas of use (zones) and the conditions of use (explosion groups) are subdivided into categories for the electrical operating means:
Unit | Explosion | Area of use |
categories | group |
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M1 | I | |
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M2 | I | |
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1G | II | Zone 0 Explosive environment by gas, fumes or mist |
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2G | II | Zone 1 Explosive environment by gas, fumes or mist |
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3G | II | Zone 2 Explosive environment by gas, fumes or mist |
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1D | II | Zone 20 Explosive environment by dust |
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2D | II | Zone 21 Explosive environment by dust |
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3D | II | Zone 22 Explosive environment by dust |
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