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CT4 and CT6 indicate operational surface temperatures, not the withstand temperatures, for explosion-proof products. Products classified under the T6 category provide enhanced safety due to their lower operational surface temperatures compared to the T4 category.
| Гурӯҳи ҳарорати таҷҳизоти барқӣ | Ҳарорати максималии иҷозатдодашудаи сатҳи таҷҳизоти барқӣ (℃) | Ҳарорати оташгирии газ/буғ (℃) | Сатҳи ҳарорати мувофиқи дастгоҳ |
|---|---|---|---|
| Т1 | 450 | > 450 | T1 ~ T6 |
| Т2 | 300 | > 300 | T2 ~ T6 |
| Т3 | 200 | > 200 | T3 ~ T6 |
| T4 | 135 | > 135 | T4 ~ T6 |
| Т5 | 100 | > 100 | T5 ~ T6 |
| T6 | 85 | > 85 | T6 |
The CT4 explosion-proof motor carries an Exd IIC T4 rating and is generally used in environments where the ambient temperature is approximately 135℃.