Basics
1 ground fault
2 ground fault
Secondary grounding
The secondary grounding ensures reliable protection in case of ground faults in DC circuits
of electrical systems. Ground faults may lead to dangerous situations for persons and
machines.
A ground fault is an impermissible conductive connection to PE, e.g., if the bare wire
touches a grounded housing as a result of a damaged insulation.
Figure 2-4 shows that ground faults are extremely critical when occurring in the current
path between the secondary fuse and load. A double ground fault in this area leads to a
short circuit across the switch in the worst case and thus to an unintentional machine start.
st
nd
230 V
AC
M
5598D408
Figure 2-4
Without secondary grounding
5598_en_03
PHOENIX CONTACT
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