January 2012 3.2 Environmental Conditions 157
3.2.2 Heat generation and cooling
A heat exchanger or a cooling unit is preferable for controlling the internal tem-
perature of the electrical cabinet.
If filtered air is blown into the electrical cabinet for cooling purposes, the stan-
dard IEC 61800-5-1 applies, which permits contamination level 2.
Be sure to take the measures required for preventing dust or water from
entering the electrical cabinet or the housing.
Dust depositing inside electrical devices may cause them to fail and impair
the safety of the system. Max. contamination level 2 is permitted for the
components.
Incorrect Correct
Blocking
elements
Elements with
considerable heat
generation
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