Siemens S5-135U/155U System Manual page 62

Installation Guidelines
Where subracks (CC and EU) are arranged one above the other, the
installation clearances in the following table must be observed.
Upper Subrack Lower Subrack
S5-135U/ 155U S5-135U
or
S5-115U
or
S5-115U with fan
S5-90U/ 95U/ 100U S5-90U/ 95U/ 100U
S5-115U without fan
S5-90U/ 95U/ 100U
The following two points should be observed to improve the air circulation
within the cabinet:
3-36
Min. Clearances
The expansion unit with the greatest power dissipation to be removed
should be the upper unit.
If subracks of the S5-135U/155U series are installed together with
subracks of the S5-90U to 115U series in one cabinet, the rear panels of
all subracks must be at the same distance from the rear wall of the
cabinet.
Max. Clearances
75 mm The maximum clearance
87 mm if baffle is limited by the lengths
is used of connecting cables for
the interface modules. h i f
60 mm
100 mm
75 mm
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System Manual