Siemens CPU 313C Hardware And Installation Manual page 38

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Note the following specifications when you determine the dimensions of a cabinet
suitable for an S7-300 installation:
• Space required for racks (rails)
• Minimum clearance between the racks and cabinet walls
• Minimum clearance between the racks
• Space required for cable ducts or fans
• Position of the stays
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Modules may get damaged if exposed to inadmissible ambient temperatures.
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Information on permissible ambient temperatures is in the Appendix: see $PELHQW
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5-12
S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
A5E00105492-03