Siemens S5-135U/155U System Manual page 61

75 mm min., smaller clearances are possible with a closed cabinet roof and an additional, separate ventilation
roof.
A maximum clearance of 400 mm is possible (50 mm min.) when devices are connected next to one another.
75 mm min. from obstructions (large apparatus) in the air inlet area.
400 mm minimum installation height above access level for control elements, 200 mm for connections.
Maximum installation height for control elements: 2100 mm to DIN VDE 0106, Part 100,
2000 mm to DIN VDE 0113.
Space for air circulation (400 mm deep cabinets are sufficient).
Baffles are recommended to improve the air supply.
Figure 3-15 Clearances in the Cabinet
System Manual
C79000-G8576-C199-06
Installation Guidelines
3-35