Use in Hazardous Environments
•
25
Classifications meeting the NEC 500
WAGO-I/O-SYSTEM 750
I/O Modules
3.4.3 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 to 450 °C
T2A
280 °C
> 280 °C to 300 °C
T2B
260 °C
> 260 °C to 280 °C
T2C
230 °C
>230 °C to 260 °C
T2D
215 °C
>215 °C to 230 °C
T3
200 °C
>200 °C to 215 °C
T3A
180 °C
>180 °C to 200 °C
T3B
165 °C
>165 °C to 180 °C
T3C
160 °C
>160 °C to 165 °C
T4
135 °C
>135 °C to 160 °C
T4A
120 °C
>120 °C to 135 °C
T5
100 °C
>100 °C to 120 °C
T6
85 °C
> 85 °C to 100 °C
