Siemens SIMATIC S7-400 Hardware And Installation Manual page 32

Installing the S7-400
Plain washer
M6 nut
Step 4: Mounting Additional Racks
If you assemble an S7-400 with two or more racks, you must allow additional
clearance between the individual racks or install a fan subassembly or cable duct.
The figure below shows the clearance you must allow between two racks of the
S7-400 during installation.
110 mm
2-12
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M6 threaded bolt
Contact washer
Terminal
To chassis
ground
S7-400 and M7-400 Programmable Controllers, Installation Manual
C79000-G7076-C424-01