Application in Explosive Environments • 311
Modular I/O System
ETHERNET TCP/IP
8.4.3 Temperature
classes
Electrical components for explosive areas are differentiated by temperature
classes:
Temperature classes
Maximum
surface temperature
Ignition temperature
of the combustible materials
T1
450 °C
> 450 °C
T2
300 °C
> 300 °C - 450 °C
T2A
280 °C
> 280 °C - 300 °C
T2B
260 °C
> 260 °C - 280 °C
T2C
230 °C
>230 °C - 260 °C
T2D
215 °C
>215 °C - 230 °C
T3
200 °C
>200 °C - 215 °C
T3A
180 °C
>180 °C - 200 °C
T3B
165 °C
>165 °C - 180 °C
T3C
160 °C
>160 °C - 165 °C
T4
135 °C
>135 °C - 160 °C
T4A
120 °C
>120 °C - 135 °C
T5
100 °C
>100 °C - 120 °C
T6
85 °C
> 85 °C - 100 °C
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