Siemens SIMATIC S7-1500/ET 200MP System Manual page 132

4. Connect the opposite end of the grounding cable to the central grounding point/protective
conductor busbar (PE).
①
②
③
Figure 6-3
Note
Alternative grounding of the mounting rail
Grounding with the grounding screw is not required if the following requirements are met:
The mounting rails must be permanently connected to the protective circuit using an
equivalent fitting that complies with the applicable standards, for example by permanent
attachment to a grounded control cabinet wall.
Note
You can find more information on the exact dimensions of the mounting rails in the appendix
Dimension drawings of the mounting rails (Page 356).
Automation system
System Manual, 01/2023, A5E03461182-AK
T-profile groove
Protective conductor (PE)
PE connection element for mounting rail
Attaching the protective conductor (protective earth)
Installation
6.2 Installing the mounting rail
131