User Manual
Accessories
14.2 Accessories for 3UG4 monitoring relays
3UG4 / 3RR2 monitoring relays
Manual, 02/2013, NEB927043002000/RS-AA/002
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Parallel connections of conductors
If several residual current monitoring relays are installed in one network, a conductor routed
through several residual current transformers must not be connected to itself downstream of
the transformer, as this would effectively represent a parallel connection of the conductor.
This fault occurs particularly often with neutral conductors. This fault causes the currents to
be distributed across the conductor. This means that the current flowing through the load to
be monitored is no longer 100 % of the total current and all integrated monitoring relays
measure fault currents.
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