Shenhai eksplozijsko varen
T4 is one of the temperature classifications. The most optimal is T6, while T1 is the least desirable.
| Temperaturna skupina električne opreme | Najvišja dovoljena površinska temperatura električne opreme (℃) | Temperatura vžiga plina/par (℃) | Veljavne temperaturne ravni naprave |
|---|---|---|---|
| T1 | 450 | ＞450 | T1~T6 |
| T2 | 300 | ＞300 | T2~T6 |
| T3 | 200 | ＞200 | T3~T6 |
| T4 | 135 | ＞135 | T4~T6 |
| T5 | 100 | ＞100 | T5~T6 |
| T6 | 85 | ＞85 | T6 |
Specifically, Group T4 is categorized by having a maximum surface temperature of ≤135°C.