According DIN VDE 0298 and IEC 183 the cables are speci U/U, where
U cable nominal voltage between the conductor and the metal covering earth and
U cable nominal voltage between the phase conductors, for 3-phase 公僓
3 U0.
As the insulation plastic insulated cables are measured with nominal voltage U0/U 0,6/1 and all radial eld
cables for the voltage U0, these cables are suitable for installation:
● single phase systems, which the both phase conductors are insulated, with nominal voltage U
● single phase systems, which one phase conductor earthed, with the nominal voltage U
Operating voltage
Voltage between conductors power system between conductor and earth under speci condition given
time during undisturbed operation.
The identi cation is: U/U (Um).
According IEC regulations, the maximum permissible voltage given brackets.
Coordination cable Nominal voltages
Nominal- for for 1-phase alternating current
voltages 3-phase both phase conductors one phase conductor
U0/U system insulated earthed
kV kV
0,6/1 1,2 0,6
3,6/6 7,2 3,6
6/10 6
12/20 12
18/30 18
Coordination maximum permissible Operating voltages
Nominal maximum maximum voltage for 1-phase alternating current
voltages voltage both phase conductors one phase conductor
U0/U for 3-phase system insulated earthed
kV kV
0,6/1 1,2 1,4 0,7
3,6/6 7,2 8,3 4,1
6/10 7
12/20 14
18/30 21
Note:
Cable with U0/U 0,6/1 allowed for Direct Current Systems, those the maximum operating voltage
conductor/conductor 1,8 conductor/earth 0,9 not exceeded.
NOMINAL VOLTAGE AND OPERATING VOLTAGE
.1062
Nominal voltage
Voltage cables and wires, which the construction and the tests respect electrical characteristics are be
refered
