Siemens SENTRON PAC1020 Manual page 30

Connection
4.1 Safety instructions
Permissible nominal voltage and tolerance for each of the connection types
Three-phase four- Three-phase four-
wire systems wire systems
a)
with grounded with ungrounded
neutral conductor neutral conductor
(IT systems)
TT system
TN-C-S system
230 / 400 V 230 / 400 V
(+20 %)
The two voltage values that are separated by a forward slash (/) stand for the phase-to-neutral (or line-to-neutral) volt-
a)
age, followed by the voltage between the phases (or line-to-line). For example, "230 / 400" means that the voltage be-
tween any phase and the neutral conductor is 230 V and the voltage between any phase and another phase is 400 V.
Similarly, "230 / 460" means that the voltage between each phase and the neutral conductor is 230 V and the voltage be-
tween the two phases is 460 V.
Z is an impedance (usually 1500 Ω) that can be connected between the neutral conductor and ground.
b)
If the insulation is monitored, the neutral conductor is considered to be grounded.
c)
Excerpt from DIN EN 61010-1 (VDE 0411-1): 2020-03
28
Line supply systems and nominal voltages
Three-phase three-
wire systems
a)
ungrounded
b, c)
400 V
(+20 %) (+20 %)
Three-phase three- Single-phase two-
wire systems wire systems
with grounded
phase
230 V
(+20 %)
Equipment Manual, 05/2020, L1V30610008B-01
Split-phase (single-
phase three-wire)
systems
AC or DC
AC or DC
230 V 230 / 460 V
(+20 %) (+20 %)
a)
PAC1020