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For all areas, the surface temperature of the electronic equipment shall not
increase in a way that the dust as cloud or layer can be ignited.
This is possible when the following conditions are respected :
-
For the prevention of inflammation of dust atmospheres, the maximum
temperature of the surface must be limited.
It must be less than the lower of the two values such as 2/3 on the considered
temperature auto-inflammation of dust cloud.
Temperature
-
permissible
Surfaces on which it is not possible to avoid a dangerous incandescent dust
(Dust)
deposition, the surface temperature must not exceed the incandescent
temperature of 75K.
In case of upper layer to 5mm, a greater reduction of the temperature is
necessary.
If the dust is present in both the cloud and the layer, as is often the case, choose
the most unfavourable case.
Remark : for the term we use area, the casing containing electrical equipment.
Static pressure : +100 bar
Permissible
Dynamic pressure : less or equal to 1 bar/ms
overpressure
II 1 G D
ia IIC T6 Ga
t IIIC T85 °C Da IP6X
Protection
-40 °C Tamb +70°C
against
According to
EN 60079-0 (2009) / IEC 60079-0 (2011)
explosions
EN 60079-11 (2007) / IEC 60079-11 (2011)
EN 60079-31 (2009) / IEC 60079-31 (2008)
CE type
examination
LCIE 12 ATEX 3012 X
certificate
CE marks
and number
CE 0359
Dust as cloud :
Dust layer :
16
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