2857-570/024-001
Connection
74
Product manual | Version: 2.0.0
3-Phase Power Measurement Module, 1 A
Table 74: Common Mains Supply Systems and Line Voltages outside the scope of UL
3-phase 4-
wire systems
with earthed
neutral con-
ductor
1
3-phase 4-
wire systems
with no
earthed neu-
tral conduc-
tor
1, 2, 3
3-phase 3-
wire system
not earthed
3-phase 3-
wire systems
with earthed
phase
1
1-phase 2-
wire system,
AC or DC
Split 1-phase
3-wire syste,
AC or DC
1
System volt-
age
4
TT system:
TN-C-S sys-
tem:
IT system:
347 V / 600 V
380 V / 660 V
400 V / 690 V
347 V / 600 V
400 V / 690 V
600 V
1)
Voltage specifications with forward slash:
1. Voltage specifications: Voltage between line conductor and neutral conductor
2. Voltage specifications: Voltage between the line conductors
2)
R is an impedance that may be connected between neutral conductor and ground. This impedance is nor-
mally 1500 Ω.
3)
When monitoring the isolation, the neutral conductor is considered to be earthed.
4)
The system voltage is derived from the line-to-neutral voltage for common mains supply systems and is used
for determining insulation coordination.
