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What is the relationship between the rated voltage of the cable and the number of cable cores?
Published:
2022-11-29 14:48
Source:
single-core cable
In case of long circuit, high working current circuit or underwater laying, single core cable can be selected to avoid or reduce intermediate joints, or when single core cable has better comprehensive technology and economy than multi-core cable.
Single core cable can be used for low-voltage DC power supply circuit when necessary.
2-core cable
When the neutral point of 1kV and below power supply is directly grounded, the number of cable cores of single-phase circuit shall be 2-core cable when the protective wire and neutral wire share the same conductor.
DC power supply circuit should adopt 2-core cable.
3-core cable
When the neutral point of 1kV and below power supply is directly grounded, the number of cable cores of single-phase circuit is: when the protective wire and neutral wire are independent, 3-core cable should be used.
4-core cable
For 4-core cables (3+1 cables) of 1kV and below, the fourth core shall be used as protective grounding and also transmit unbalanced current and short circuit current of the power system. Its size is determined by unbalanced current and short circuit current, but generally not less than 1/2 of the phase line.
For 1kV and below three-phase four wire low-voltage distribution system, when the protective wire and neutral wire share the same conductor, 4-core cable shall be used, instead of 3-core cable plus single core cable combining into a loop, or even directly using the metal sheath or armor layer of 3-core cable as the neutral wire. Otherwise, when the three-phase current is unbalanced, it is equivalent to the running state of single core cable, which is easy to cause power frequency interference.
5-core cable
For the three-phase four wire low-voltage distribution system of 1kV and below, some distribution lines for electrical devices with high requirements, and some communication centers and automation equipment that need to ensure electrical integrity and anti-interference grounding, the TN-C low-voltage distribution system with five core wires should be used to make the protective wire (PE wire) and neutral wire (PN wire) independent, and the cable core cross-sectional area is generally three big and two small, or four big and one small, or five big.
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