Thursday, August 31, 2017

HAZARDOUS AREA CLASSIFICATIONS Part 3 - TEMPERATURE CLASSIFICATIONS

In Continuation of my previous Post  Area Classification ,   


we continue in  TEMPERATURE CLASSIFICATIONS

• Hot surfaces can ignite explosive atmospheres. To guard against this, all electrical equipment intended to use in a potentially explosive atmospheres is classified according to max. surface temp. it will reach in service.

• This temp. is normally based on a surrounding ambient temp. of 40 deg C (102 deg F).

• This temp. is compared to the ignition temp. of the gases which may come in contact with the equipment & checked for the suitability.

 

IEC 79-8 / EN 50014
NEC Table 5003 (d)
Max. Surface Temp.  (Deg C)
T1
T1
450
T2
T2
T2A/T2B/T2C/T2D
300
280/260/230/215
T3
T3
T3A/T3B/T3C
200
180/165/160
T4
T4
T4A
135
120
T5
T5
100
T6
T6
85

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