B.2 International Electrotechnical Commission (IEC) Classification of Hazardous Locations, Continued
IEC Temperature Classification
Certification and Conformity Details
Equipment intended for installation directly within the hazardous location must also be classified for the maximum surface temperature that can be generated under normal or fault conditions as referenced to the maximum operating ambient of the equipment. The maximum surface temperature must be less than the minimum autoignition temperature of the hazardous atmosphere present. The temperature shall be indicated in identification numbers as listed in the following table.
| Maximum Temperature | Identification Number |
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| Degrees C | Degrees F |
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| 450 | 842 | T1 |
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| 300 | 572 | T2 |
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| 200 | 392 | T3 |
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| 135 | 275 | T4 |
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| 100 | 212 | T5 |
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| 85 | 185 | T6 |
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Table | CENELEC / LCIE Certification | |||
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| Code |
| Description | |
| 3D | Flameproof, Supply ≤ 45 Vdc, IP 66/67EEx d IIC T6. | ||
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| 3A | Intrinsically Safe EEx ia IIC T5, −40 ≤ Ta ≤ 93°C. | ||
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| Flameproof, Supply ≤ 45 Vdc, IP 66/67 EEx d IIC T6. | ||
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| LCIE Intrinsic Safety Parameters (1) | ||
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| Ui = 30 V |
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| Ii = 100 mA |
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| Pi = 1.2 W |
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| Ci = 4.2 nF |
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| Ri = 0 |
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| Li = 0 |
| With no integral indicator, or with |
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| integral Smart Meter, option SM. |
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| Li = 150 ∝H |
| With Analog Meter, option ME. |
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(1)Install in accordance with Honeywell drawing 51204243.
2/05 | ST 3000 Release 300 Installation Guide | 91 |