# Base voltage for tests

$U_0$ is multiplied by a factor to get the test voltage. The test voltage is according to:

• the IEC 60502 for rated voltages 1 - 30 kV
• the IEC 60840 for rated voltages up to 150 kV
• the IEC 61067 for rated voltages above 150 kV.

For a three-phase system, $U_o$ corresponds to the rated phase-to-ground voltage of the cable.

Symbol
$U_{0}$
Unit
kV
Related
$U_{n}$