Nominal voltage

Voltage of cables and wires, by which the construction and the tests in respect of electrical characteristics are to be referred.

According to DIN VDE 0298 and IEC 183 the cables are specified Vo/V,

where Vo = cable nominal voltage between the conductor and the metal covering or earth and

V = cable nominal voltage between the phase conductors, for 3-phase V = 3^-1/2 Vo

According to IEC regulations, the maximum permissible voltage Um is given in brackets. The identification is: Vo/V (Vm). As the insulation of plastic insulated cables are measured with a nominal voltage Vo/V = 0,6/1 kV and all radial field cables for the voltage Vo, these cables are suitable for installation:

* in single phase systems, in which the both phase conductors are insulated, with nominal voltage Vn = 2 Vo

* in single phase systems, in which one phase conductor is earthed, with the nominal voltage Vn = Vo

Operating voltage

Voltage between conductors of a power system or between a conductor and earth under specified condition in a given time during an undisturbed operation.

Note:

Cable with Vo/V 0,6/1 kV is allowed for Direct Current Systems, of those the maximum operating voltage conductor/conductor 1,8 kV or conductor/earth 1,8 kV not to be exceeded.