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
Choices
$U_n$$U_m$$U_0$Standard
208 V240 V120 VUSA, Canada
400 V440 V230 VDIN VDE 0298-3
480 V600 V277 VUSA, Canada
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
6.6 kV7.2 kV3.8 kVHD 620 S2:2010 Part 1
10 kV12 kV6 kVIEC 60502-2 Ed.3.0
11 kV12 kV6.35 kVused in UK & Commonwealth
15 kV17.5 kV8.7 kVIEC 60502-2 Ed.3.0
20 kV24 kV12 kVIEC 60502-2 Ed.3.0
22 kV24 kV12.7 kVHD 620 S2:2010 Part 1
25 kV30 kV15 kVHD 620 S2:2010 Part 1
30 kV36 kV18 kVIEC 60502-2 Ed.3.0
33 kV36 kV19 kVused in UK & Commonwealth
36 kV42 kV20.8 kVHD 620 S2:2010 Part 1
45 kV52 kV26 kVIEC 60840 Ed.4.0
60 kV72.5 kV36 kVIEC 60840 Ed.4.0
66 kV72.5 kV38 kVused in UK & Commonwealth
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
275 kV300 kV160 kVused in UK & Commonwealth
280 kV300 kV160 kVIEC 62067 Ed.2.0
330 kV362 kV190 kVIEC 62067 Ed.2.0
380 kV420 kV220 kVIEC 62067 Ed.2.0
400 kV420 kV230 kVused in UK & Commonwealth
500 kV550 kV290 kVIEC 62067 Ed.2.0