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Requirements for protective grounding
To wire a permanently connected protective grounding, use copper cables with a cross-section
of ≥ 2.5 mm
protected, use cables with a cross-section of 4.0 mm
6.5.3
Protective grounding (100 to 240 VAC / 110 to 250 VDC device versions)
The connection of the reference potential surface with the protective conductor system is
normally in the control cabinet close to the power feed-in. This grounding safely conducts fault
currents to ground and thus ensures the safety of the electrical system. According to DIN/VDE
0100, it protects persons, animals, and property from excessive contact voltages.
No protective grounding for devices with 100 to 240 VAC / 110 to 250 VDC power supply
Risk of electric shock
When connecting to the power supply, observe the following:
• IEC plug: Ensure that the socket outlet used has a protective earth connection that matches
• Connection terminals: Connect the terminals according to the terminal assignment
Connect the second protective conductor
Due to the possible leakage currents, it is imperative that you connect a second protective
conductor permanently to the device. The work must be performed by a specialist according to
IEC 62368-1.
Requirements for protective grounding
To wire a permanently connected protective grounding, use copper cables with a cross-section
of ≥ 2.5 mm
protected, use cables with a cross-section of 4.0 mm
For the 100 to 240 VAC / 110 to 250 VDC devices, the grounding bolt is provided to connect the
protective grounding as well as the functional grounding at the same time.
SCALANCE XRH-300/XRM-300
Equipment Manual, 10/2022, C79000-G8976-C546-01
2
if the cables are mechanically protected. If the cables are not mechanically
WARNING
the power plug used.
diagram. Connect the protective ground first.
Terminal blocks may only be connected and disconnected by a qualified electrician.
Connect or disconnect power supply cables only in the de-energized state.
WARNING
if the cables are mechanically protected. If the cables are not mechanically
2
.
2
.
2
Connecting up
6.5 Grounding
65
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