Equipotential Bonding - Siemens S7-300 Installation Manual

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The figure below shows some options for mounting shielded cables, using cable
clamps.
Figure 12-4 Mounting cable shielding
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Potential differences can occur between separate system elements. This can result
in high equipotential currents, e.g. if the cable shielding is terminated at both ends
and grounded to different system components.
The cause of potential difference can be differences in the power supplies.
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Cable shielding is not suitable for equipotential bonding. Always use the prescribed
cables (e.g. with a cross-section of 16 mm
provide a sufficient conductor cross-section. Otherwise, interface hardware might
get damaged or even be destroyed.
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S7-300 Automation System, Hardware and Installation: CPU 312IFM - 318-2 DP
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