â‘ Phase (and neutral conductor)
â‘¡ Shield sleeve
â‘¢ Residual current transformer
13.2.5.4 Installation faults
For reasons of clarity, the representations show only the residual current transformer with the
currents passing through it rather than the complete residual current monitoring unit and
residual current transformer. If the vectorial sum of the currents passing through the residual
current transformer does not equal zero, part of the current is bypassing the transformer to
ground and the residual current monitoring relay triggers a warning or an alarm if the current is
correspondingly high.
In some instances, false alarms may occur for no apparent reason. However, these represent
installation faults.
The following examples demonstrate the most common installation faults.
Accessories
13.2 Accessories for 3UG4 monitoring relays
SIRIUS 3UG4 / 3RR2 monitoring relay
256 Equipment Manual, 07/2021, NEB927043002000/RS-AD/005
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