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Rated Voltage of cable U0/U(Um)£º£º0.6/1(1.2)kV

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Rated A.C. Voltage between conductor and ground/metal screen;

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Rated A.C. Voltage between conductors

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The maximum system voltage which the equipments can be beared

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The rated voltage of cable shall be applicable to system operation condition where the cable lain in. According to cable selecting, the system will be described as 3 types as follow:

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System category A ¡ªWhen any phase of cable conductor is contacting with earth conductor, the cable will be isolated     with the system.

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System category B¡ªThe system is allowed to run for 8 hours, when the single-phase earth fault is existing. And the total earth-fault time of 1 year won't be above 125 hours.

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System categoryC ¡ªThey are including all systems besides A and B.

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When the system earth fault can't be removed automatically, the life of cable will be shortened in some degree because of the over-high electric stess beared by cable insulation.

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The recommended figure of U0 see the book 1, which are suitalbe for the three systems.

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