Guidelines for the Planning and Installation of the Product S5-95F
Routing of Cables Outside Buildings
Outside buildings, lay the lines on metal cable trays if possible. Provide the joints between cable
trays with an electrical connection and ground the cable trays.
When laying lines outside buildings, you must observe the valid lightning protection and grounding
measures. The following applies in general:
Lightning Protection
Where cables and lines for SIMATIC S5 controllers are to be laid outside buildings, you must apply
measures for internal and external lightning protection.
Outside the buildings, lay your lines either
• in metal conduits grounded at both ends,
or
• in concreted cable ducts with continuously connected reinforcement.
Protect the signal lines from overvoltages by means of
• varistors
or
• inert gas-filled surge diverters.
Fit these protective devices at the cable entry into the building.
Note
Lightning protection measures always require an individual assessment of the entire
installation. For clarification, please consult your local Siemens Office or a company
specializing in lightning protection, such as Messrs. Dehn und Söhne in Neumarkt or
Messrs. Wieland in Bamberg, both Germany.
Equipotential Bonding
Ensure adequate equipotential bonding between the connected equipment (see section 3.4.2).
3-8
EWA 4NEB 812 6210-02
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