9 minutes to know relation between rated voltage and number of cable cores

What is the relationship between the rated voltage of the xlpe insulated power cable and the number of cable cores. Do you all understand? The following editor will give you a detailed introduction about how to choose the number of cable cores. This article only covers the selection conditions of low tension cable of 1kV and below for 1~5-core cables, and does not introduce high-voltage cables.

single core cable

In order to avoid or reduce intermediate joints, or when single-core xlpe insulated power cables have better comprehensive technology and economy than multi-core cables, single-core cables can be selected when circuits with long lines and large operating currents or underwater laying. Low voltage DC supply circuit, single core xlpe insulated power cable can be used when required.

2 core cable

When the neutral point of the power supply of 1kV and below is directly grounded, the number of cable cores in the single-phase loop, when the protection wire and the neutral wire share the same conductor, should use a 2-core xlpe insulated power cable. For the DC power supply circuit, a 2-core low tension cable should be used.

3 core cable

When the neutral point of the power supply of 1kV and below is directly grounded, the number of cable cores of the single-phase loop is: when the protection wire and the neutral wire are independent, a 3-core xlpe insulated power cable should be used.

4 core cable

​For 4-core low tension cables (3+1 cables) of 1kV and below, the 4th core is not only used as protective grounding, but also transmits unbalanced current and short-circuit current in the power system. Its size is determined by the unbalanced current and short-circuit current, but generally not less than 1/2 of the phase line.

In the three-phase four-wire low-voltage power distribution system of 1kV and below, when the protection wire and the neutral wire share the same conductor, a 4-core cable should be used instead of a combination of a 3-core cable and a single-core cable to form a circuit, or even directly The method of using the metal sheath or armor layer of the 3-core cable as the neutral wire. Otherwise, when the 3-phase current is unbalanced, it is equivalent to the running state of the single-core cable, which is easy to cause power frequency interference.

5 core cable

The three-phase four-wire low-voltage power distribution system of 1kV and below, some electrical installation distribution lines with high safety requirements, and some communication centers and automation equipment that not only ensure electrical safety, but also anti-interference grounding, should use The TN-C low-voltage power distribution system with 5 cores makes the protection wire (PE wire) and the neutral wire (PN wire) independent.

Hope the content above can help your procurement more efficient and welcome to contact us for the latest price of our low voltage power cable including XLPE orange circular cable and PVC insulated armoured cable.