Siemens SIMATIC ET 200M Operating Instructions Manual page 62

Installation
4.2 Installation
Installing the mounting rail
To install the rail, proceed as follows:
1. Choose a position for the rail that leaves enough room to install it properly and enough
space to cope with the temperature rise of the modules. Observe the minimum clearance
distances of 40 mm above and below the rail.
2. Connect the rail to the base (screw size: M6).
Is this base a grounded metallic plate or a grounded device supporting plate?
If not: No particular steps are required.
If so: Ensure there is a low-impedance connection between the rail and the base. In the
case of painted or anodized metals, for instance, use a suitable contacting agent or
contact washers.
3. Connect the rail to the protective conductor. An M6 screw is provided for this purpose on
the rail.
Minimum cross-section of the cable to the grounding wire: 10 mm
Note
Ensure that your connection to the protective conductor is low-impedance (see the
following figure). If the ET 200M is mounted on a hinged rail, for example, you must use a
flexible cable to establish the connection to the protective conductor.
Connection of protective conductor
The following figure shows you how to connect the protective conductor to the rail.
Figure 4-2
See also
Clearance Measurements (Page 42)
62
Connecting the protective conductor to the rail
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Operating Instructions, 04/2022, EWA-4NEB7806006-09
ET 200M