Interference-free cable routing
3.5 Underground cable routing
Designing interference-free controllers
Function Manual, 06/2014, A5E03461486-AB
13
3.5
Underground cable routing
Rule
Observe the following rules for underground cable routing:
●
Lay the cable at least 60 cm below the ground surface.
●
Install equipotential bonding approximately 20 cm above the cable. You can use a zinc-
plated ground strip, for example. The ground strips also serve as protection against
lightning strikes.
●
Protect the cable against mechanical damage by, for example, using a plastic pipe and/or
a cable warning tape in the ground, approximately 40 cm above the cable.
●
Separate the various cable categories in the ground using cable channels, for example.
The following figure shows the arrangement of cable warning tape, equipotential bonding
and a cable.
Figure 3-2
Arrangement underground
Lightning protection
When you lay cables for SIMATIC devices outside of buildings, you have to take internal and
external lightning protection measures.
Reference
For additional information about lightning protection, refer to chapter Lightning protection and
overvoltage protection (Page 26).
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