16
UMG 104
Three-phase 3-wire systems
The UMG104 can be used in unearthed
three-phase 3 wire systems (IT system). The
conductor to conductor voltage may not
exceed 480V AC (50 Hz, 60 Hz).
The UMG104 is only suitable for environments
in which the impulse voltage withstand level of
4 kV (overvoltage category III) is not exceeded.
In the IT system the neutral point (star point)
of the voltage generator is not earthed. The
bodies of the electrical system are earthed.
Earthing via high-resistance impedance is
allowed.
IT systems are only allowed in certain systems
with their own transformer or generator.
U
L-L
66 V
115 V
120 V
127 V
200 V
230 V
240 V
260 V
277 V
347 V
380 V
400 V
415 V
440 V
480 V
Fig. 16.1 Table of rated voltages of
the grid suitable for the voltage in-
puts.
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