Siemens SINAMICS S120 Manual page 528

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8.45 M21, degree of protection IP21
Description
To increase the degree of protection of the cabinet units from IP20 (standard) to IP21,
additional canopies are supplied.
Increasing the degree of protection in this way ensures that not only is the cabinet unit
protected against the ingress of foreign bodies with a diameter of 12.5 mm and above (IP20,
protection level provided as standard), but also against the ingress of water droplets falling
vertically from above (IP21).
The canopy is mounted using spacers at a distance of 250 mm above the top cover of the
cabinet. The canopy increases the height of a cabinet unit by 250 mm, as shown in the
diagram below (number (1)).
Figure 8-56
Note
Only the protective requirements described above can be fulfilled with IP21. For more
stringent requirements, you must select the corresponding IP degree of protection (for
example, IP23 for additional protection against spraying water).
Note
Installing the canopy or hood at a an early stage!
It is recommended to attach the canopy or hood at an early stage to prevent foreign matter
entering the cabinet units.
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Cabinet with canopy (250 mm higher)
Cabinet Modules
Manual, 03/2013, A5E03263538A