Siemens Simatic S7-1500R System Manual page 102

Attaching the protective conductor
The mounting rails of the S7-1500R/H redundant system must be connected to the
protective conductor system of the electrical system to ensure electrical safety.
Proceed as follows to connect the protective conductor:
1. Strip the grounding conductor with a minimum diameter of 10 mm
for M6 bolts with the crimping pliers.
2. Slide the enclosed bolt into the T profile groove.
3. Insert the spacer, ring terminal with the grounding connector, flat washer, and lock
washer onto the bolt (in that order). Thread on the hexagon nut. Fasten the components
in place with the nut (torque 4 Nm).
4. Connect the opposite end of the grounding cable to the central grounding point/protective
conductor busbar (PE).
5. If you mount the redundant system on separate mounting rails, repeat steps 1 to 4 for the
second mounting rail.
Figure 4-3
Note
Alternative grounding of the mounting rails
Grounding with the grounding screw is not required if the following requirements are met:
The mounting rails must be permanently connected to the protective conductor system using
an equivalent fitting that complies with the applicable standards, for example by permanent
attachment to a grounded control cabinet wall.
S7-1500R/H redundant system
System Manual, 10/2018, A5E41814787-AA
Attaching the protective conductor
Installation
4.2 Installing the mounting rail
. Attach a ring terminal
2
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