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Application in Explosive Environments • 7
Classifications meeting the NEC 500
WAGO-I/O-SYSTEM 750
Modular I/O-System
Ex-1.4.3 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