Connecting The Protective Conductor To The Rail - Siemens CPU 313C Hardware And Installation Manual

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The rail is fixed to the mounting surface.
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1. Connect the protective conductor to the rail,
using the M6 protective conductor bolt.
Minimum cross-section of the protective conductor: 10 mm
The figure below shows how the protective conductor must be bonded to the rail.
Figure 7-1 connecting the protective conductor to the rail
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Always ensure a low-impedance connection of the protective conductor. You can
achieve this by bonding a cable with low impedance and as short as possible to a
large contact surface.
For example, if the S7-300 is mounted on a hinged frame you must use a flexible
ground strap.
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S7-300 Automation System, Hardware and Installation: CPU 31xC and CPU 31x
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A5E00105492-03