Rated voltage refers to the best voltage for continuous normal operation of electrical equipment. Rated voltage is also called nominal voltage.
The voltage rating of a cable is the highest voltage that may be continuously applied to a cable construction in compliance with the relevant cable standard or specification.
Voltage rating figures for cables are normally expressed in A.C. RMS. (Alternating Current Root Mean Square) and are written as a figure Uo/U (Um)
Uo = Rated voltage phase to Earth
U = Rated voltage phase to phase
Um = Maximum system
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Power cables are generally manufactured at certain voltage levels.
The voltage levels are 0.5kV, 1kV, 3kV, 6kV, 10kV, 20kV, 35kV, 60kV, 110kV, 220kV, and 330kV in order.
1kV voltage-level power cables are the most used.
Power cables with a voltage level of 3 to 35 kV are often used in the main power supply lines in large and medium-sized buildings.
Power cables with a voltage of 60-330kV are used in power transmission lines that are not suitable for overhead conductors, as well as for crossing rivers and submarine laying.
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