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Nominal voltage and Operating voltage Nominal voltage U0 = cable nominal voltage between the conductor and the metal covering p or earth and U = cable nominal voltage between the phase conductors, for 3-phase U = 3 U0 R Voltage of cables and wires, by which the construction and the tests in respect of electrical characteristics are to be refered. According to DIN VDE 0298 and IEC 183 the cables are specified U0/U, where According to IEC regulations, the maximum permissible voltage Um is given in brackets. The identification is: U0 /U (Um). As the insulation of plastic insulated cables are measured with a nominal voltage U0/U = 0,6/1 kV and all radial field cables for the voltage U0, these cables are suitable for installation: * in single phase systems, in which the both phase conductors are insulated, with nominal voltage UN = 2 U0 * in single phase systems, in which one phase conductor is earthed, with the nominal voltage UN = U0 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. Coordination of cable-Nominal voltages Nominal voltages U0/U kV for 3-phase system kV 0,6/1 1 1,2 0,6 3,6/6 6 7,2 3,6 6/10 10 12 6 12/20 20 24 12 18/30 30 36 18 for 1-phase alternating current both phase conone phase conductor ductors insulated earthed kV kV Coordination of maximum permissible Operating voltages Nominal voltages U0/U kV maximum voltage for 3-phase system kV 0,6/1 1,2 1,4 0,7 3,6/6 7,2 8,3 4,1 maximum voltage for 1-phase alternating current both phase conone phase conductor ductors insulated earthed kV kV 6/10 12 14 7 12/20 24 28 14 18/30 36 42 21 Note Cable with U0/U 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. T 16