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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
A5E00105492-03
12-17
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The same EMC compatibility rules apply both for indoor and outdoor routing of
cables. The following also applies:
• Running cables on metal cable trays.
• Electrical connection of the joints of cable trays/ducts.
• Ground the cable carriers.
• If necessary, provide adequate equipotential bonding between connected
devices.
• Take the necessary (internal and external) lightning protection and grounding
measures in as far as they are applicable to your particular application.
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Run your cables either:
• in metal conduits grounded at both ends, or
• in concrete cable ducts with continuous end-to-end armoring.
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An individual appraisal of the entire plant is necessary before any lightning
protection measures are taken.
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can be found in the Lightning and surge voltage protection section.
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