Technical Documentation: Fire Detectors used in hazardous areas
P-DET/EX/RCE/PM5/GKa/110995 10 Autronica Fire and Security AS
1.4 Limiting temperatures
The table shows limiting temperatures for electrical equipment which may be
mounted in hazardous area, according to regulations made by IEC, VDE and
NEC.
The temperature limits are valid for parts of the equipment, and for every
possible condition.
Classification Classification Classification
according to: according to: according to:
IEC/CENELEC VDE 170/0171/2.61 NEC(USA/Canada)
Igniting
temperature Temp. Temp. Igniting Max. Max. Temp. Gas
for gases class limit group temp. temp. identi- igniting
°C °C °C °C fication temp.
Contin- Short
ously term
450 T1 450 G1 T1 450
300 T2 300 360 400 T2 300
T2A 280
G2 270 T2B 260
240 T2C 230
T2D 215
200 T3 200 T3 200
180 T3A 180
G3 T3B 165
160 T3C 160
135 T4 135 T4 135
G4 125 T4A 120
110
100 T5 100 G5 90 T5 100
85 T6 85 80 T6 85
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