Rated line-to-line voltage

$U_n$ is the rated line-to-line voltage of the cable. $U_m$ is the highest voltage for the equipment and $U_0$ is the test voltage (values from the standards listed below).

The rated voltage of a cable is limited to the choices below. However, when laid in a project, the operating voltage of every cable system can be chosen arbitrary in the range between 400 V to 500 kV AC (1 to 5 kV DC).

Symbol
$U_{n}$
Unit
kV
Related
$U_{0}$
Choices
$U_n$$U_m$$U_0$Standard
400 V440 V230 VDIN VDE 0298-3
500 V550 V300 VDIN VDE 0298-3
750 V825 V450 VDIN VDE 0298-3
1 kV1.2 kV0.6 kVIEC 60502-1 Ed.2.1
3 kV3.6 kV1.8 kVIEC 60502-1 Ed.2.1
6 kV7.2 kV3.6 kVIEC 60502-2 Ed.3.0
10 kV12 kV6 kVIEC 60502-2 Ed.3.0
15 kV17.5 kV8.7 kVIEC 60502-2 Ed.3.0
20 kV24 kV12 kVIEC 60502-2 Ed.3.0
30 kV36 kV18 kVIEC 60502-2 Ed.3.0
45 kV52 kV26 kVIEC 60840 Ed.4.0
60 kV72.5 kV36 kVIEC 60840 Ed.4.0
110 kV123 kV64 kVIEC 60840 Ed.4.0
132 kV145 kV76 kVIEC 60840 Ed.4.0
150 kV170 kV87 kVIEC 60840 Ed.4.0
220 kV245 kV127 kVIEC 62067 Ed.2.0
280 kV300 kV160 kVIEC 62067 Ed.2.0
330 kV362 kV190 kVIEC 62067 Ed.2.0
380 kV420 kV220 kVIEC 62067 Ed.2.0
500 kV550 kV290 kVIEC 62067 Ed.2.0