Siemens S5-135U/155U - Manual (Page 59)

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System Manual
C79000-G8576-C199-06
3.7 Selection and Installation of Cabinets with SIMATIC S5
The following criteria must be observed when selecting and dimensioning a
cabinet:
S
Ambient conditions at the point of installation of the cabinet
S
Clearances for power supplies and subracks
S
Total power dissipation of components in the cabinet
The ambient conditions at the point of installation of the cabinet
(temperature, humidity, dust, effects of chemicals) govern the required
degree of protection of the cabinet (IP XX) as shown in the following figure.
Further information on types of protection can be found in IEC 529.
Installation Guidelines