Assembly - Siemens CPU 313C Hardware And Installation Manual

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You must maintain the clearance shown in the figure in order to provide sufficient
space to install the modules and to dissipate the heat generated by the modules.
The S7-300 assembly on multiple racks shown in the figure below specifies the
clearance between racks and adjacent components, cable ducts, cabinet walls etc.
For example, if you wire your modules using a cable duct, the clearance between
the bottom edge of the shielding contact element and the cable duct must be 40
mm.
1
20 mm
Figure 5-3 Clearance
 Wiring using a cable duct
 Clearance between cable channel and bottom edge of shielding contact element
must be 40 mm
5-6
40 mm
CPU
SM SM
2
40 mm
40 mm
PS
CPU SM
40 mm
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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
SM
200 mm + a
a
SM
20 mm
A5E00105492-03