Temperature Classification
Another important consideration is the temperature classification of the electrical equipment. The surface temperature or any parts of the electrical equipment that may be exposed to the hazardous atmosphere should be tested that it does not exceed 80% of the auto-ignition temperature of the specific gas or vapor in the area where the equipment is intended to be used.
The temperature classification on the electrical equipment label will be one of the following (in degree Celsius):
| USA°C | UK °C | Germany °C Continuous - Short Time |
|
|---|---|---|---|
| T1 - 450 | T3A - 180 | T1 - 450 | G1: 360 - 400 |
| T2 - 300 | T3B - 165 | T2 - 300 | G2: 240 - 270 |
| T2A - 280 | T3C - 160 | T3 - 200 | G3: 160 - 180 |
| T2B - 260 | T4 - 135 | T4 - 135 | G4: 110 - 125 |
| T2C - 230 | T4A - 120 | T5 - 100 | G5: 80 - 90 |
| T2D - 215 | T5 - 100 | T6 - 85 | |
| T3 - 200 | T6 - 85 | ||
The above table tells us that the surface temperature of a piece of electrical equipment with a temperature classification of T3 will not rise above 200 °C.
Read more about this topic: Electrical Equipment In Hazardous Areas
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