What is the relationship between the rated voltage of a cable and the number of cores in the cable?

I. What is the relationship between the rated voltage of the cable and the number of cable cores? Single-core cable line is longer, the working current of the circuit or underwater laying, in order to avoid or reduce the intermediate joints, or single-core cables than multi-core cables have a better overall technical economy, single-core cables can be selected. Low-voltage DC power supply circuit, when necessary, a single-core cable can be used. 2-core cable 1kV and the following power supply neutral point directly grounded, single-phase circuit of the number of cable cores, when the protective line and the neutral line with the same conductor, should be used 2-core cable. DC power supply circuit, it is appropriate to use 2-core cable. 3-core cable 1kV and below when the power supply neutral point directly grounded, single-phase circuit of the number of cable cores: when the protective line and the neutral line are independent of each other, it is appropriate to use 3-core cable. 4-core cable 1kV and below, 4-core cable (3 +1 cable), of which the fourth core in addition to serving as a protective grounding, but also to transport the power system in the imbalance current and short-circuit current. Its size is determined by the unbalance current and short-circuit current, but generally shall not be less than 1/2 of the phase line. 1kV and the following three-phase four-wire low-voltage distribution system, when the protective line and the neutral line of the same conductor, should be used in 4-core cable, and shall not be used in 3-core cables plus a single-core cable combined into a circuit, or even the direct use of 3-core cables, such as the metal sheath or armored layer for the neutral line. Otherwise, when the 3-phase current imbalance, equivalent to single-core cable operation, easily caused by industrial frequency interference.

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