Siemens SINAMICS S120 Equipment Manual page 216

Cabinet Design and EMC
12.4 Arrangement of Components and Equipment
Two-tier configuration
Figure 12-4
The distance between the two module rows depends on the wiring and cable cross-section.
For modules with a width of between 50 and 100 mm, the distance between the upper and
lower module row must be at least 300 mm.
For modules with a width of between 150 and 300 mm, the distance between the upper and
lower module row must be at least 500 mm (see Cooling).
12-16
Example of a multi-tier configuration with modules between 200 and 300 mm wide
Equipment Manual Booksize Cold-Plate Power Sections
Manual, (GH4), Edition 06.2005, 6SL3097-2AJ00-0BP2