20
DS440IS
2.3.5
Groups of substances and surface temperatures
The gases present are classified according to the energy and firing temperature (IIC, IIB, IIA and T6....T1).
2.3.6
IP protection degree and surface temperature
The casings of appliances installed where dust is present must also possess a certain IP protection degree
with a declared maximum surface temperature. This latter must be compatible with the dust ignition
temperature.
2.3.7
Description of the system installed
To facilitate the installation operations and make it easier to check whether the electrical and mechanical
parameters of the various parts forming the system are compatible with the surrounding conditions
(presence of gas and dust), the Manufacturer provides certain typical systems as described below. The
components of these systems are described and their compatibility is guaranteed.
DANGER
The customer must check to make sure that these systems are compatible with the zones and
substances in his application.
