janitza UMG 806, User Manual And Technical Data

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UMG 806 www.janitza.com
7.1.2 Three-phase 3-conductor network
The device can be used in ungrounded three-
phase 3-conductor systems (IT network).
·In an IT system, the neutral point of the voltage
generator is not grounded.
·The components of the electrical system are
grounded.
·Grounding via a high-ohmic impedance is permit-
ted.
IT networks are only permitted in certain systems
with their own transformer or generator.
Suitable mains and nominal voltages for your
meter:
400 V 50/60 Hz
DC
AC/DC
L2
L3
Auxiliary supply
Voltage measurement
L1 L3 L2
Ground-
ing of the
system
Impedance
L1
UMG 806
N
Fig. Schematic diagram, UMG 806 in an IT network
without N.
230/400V 50/60Hz
UMG 806
Ground-
ing of the
system
DC
AC/DC
L2
L3
N
L1
Auxiliary supply
L1
L3 L2 N
Impedance
Voltage measurement
Fig. Schematic diagram, UMG 806 in an IT network with N.
Suitable mains and nominal voltages for your
meter:
U
L-L
U
L-L
66 V 240 V
115 V 260 V
120 V 277 V
127 V 347 V
200 V 380 V
230 V 400 V
Tab.: Nominal network voltages suitable for measuring inputs
acc. to EN 60664-1:2003