Siemens S7-400 Installation Manual page 37

Space Required When Using Cable Channels and Fan Subassemblies
A cable duct or fan subassembly must be installed in the 19-inch pitch immediately
below the rack. Additional space for cable routing must be provided on both sides.
The following figure shows how much space you need to allow for when using a
cable duct or fan subassembly.
440 mm
Mounting depth, fitted: max. 237 mm
Dimensions of the Racks
The following figure shows the dimensions for racks with 18, 9 and 4 slots and the
positions of cutouts for screw mounting.
The cutouts are arranged according to the 19-inch standard.
S7-400 and M7-400 Programmable Controllers Hardware and Installation
A5E00069481-04
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18
Cable duct/fan subassembly
522.5 mm (with cable duct)
542.5 mm (with fan subassembly)
Installing the S7-400
19-inch reference level
2-11