6.9
Protective grounding (PoE variants)
Grounding options
For PoE variants, grounding (protective grounding) takes place using the grounding bolts on the
rear of the device.
Figure 6-8
Position of the grounding bolt on the back of the device for PoE variants
Protective grounding
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 conducts fault
currents to ground safely and according to DIN/VDE 0100 is protective grounding to protect
people, animals and property from too high contact voltages.
Connect protective grounding via a grounding bolt
WARNING
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.
To wire a permanently connected protective grounding, use copper cables with a cross-section
of ≥ 2.5 mm
2
, if the cables are mechanically protected. If the cables are not mechanically
protected, use cables with a cross-section of 4.0 mm
2
.
4
3
2
1
①
Grounding terminal with cable
②
Washer
③
Spring washer
④
Nut
Connecting up
6.9 Protective grounding (PoE variants)
SCALANCE XR-300WG
Operating Instructions, 03/2021, C79000-G8976-C454-07
67
