Temperature Class & Auto-ignition Temperature

Electrical device generates heat during operation?and the hot surface can be the source of ignition that cause an explosion?when explosive gases are present in the environment.

Therefore, to prevent an explosion, it is important to know?the maximum surface temperature that an electrical device can reach during operation?and the auto-ignition temperature of the explosive gases.

The official name of this?maximum surface temperature is Temperature Class, which can be abbreviated to T-class or T-code.?Below are the T-classes for explosion-proof devices in different Explosion protection schemes.

For example, T4 135°C means the surface temperature?of a?T4?device?will never exceed 135°C.

Auto-ignition Temperature (known as AIT)?means the lowest temperature that a mixture of air and gases will burn without extra source of ignition.

Let’s use an example to classify these 2 concepts.

?

A T4 electrical motor (135°C) installed in an atmosphere contains carbon disulphide (AIT=95°C), the result will be an explosion.

However, it is safe to use in hazardous atmosphere which Hydrogen 560°C, Ethylene 425°C, Diesel 240°C, diethyl ether 160°C?are present.

In conclusion, T-class < AIT, safe. T-class > AIT, explosion.

The explosion-proof lights AGC manufacture are T5/T6, with a maximum surface temperature of 100°C/85°C, which are safe to use in most hazardous areas where explosive gases are present.

Feel free to reach [email protected], if you are interested in any of them.

#explosionprooflight

#hazardousluminaire

#ATEX #IECEx #NEC500 #NEC505

#Temperatureclass #autoignitiontemperature

#zone1 #zone2

#C1D1 #C1D2