Principle Of Selecting The Number Of Cable Cores

All things in the world have their own attributes and levels. Moreover, wire and cable products are widely used and have a wide variety. Even if you are in the industry, it is not comprehensive. Today, Jin Huanyu wire and cable editor shares with you the principle of selecting the number of cable cores.

1.When the neutral point of 1kV and below power supply is directly grounded, and the protective wire and neutral wire in the three-phase circuit share the same conductor, four core cable shall be selected; When the protective wire and neutral wire are separate, five core cable should be selected. When the grounding of the exposed conductive part of the power receiving equipment and the grounding of the power supply system are separate, four core cables shall be selected.

2.When the neutral point of 1kV and below power supply is directly grounded, and the protective wire and neutral wire in single-phase circuit share the same conductor, two core cable shall be selected; When the protective wire and neutral wire are separate, three core cable should be selected. When the grounding of the exposed conductive part of the power receiving equipment and the grounding of the power supply system are separate, two core cables shall be selected.

 3.In 3 ~ 35kV three-phase power supply circuit, when the circuit or cable with large working current is laid underwater, three single core cables can be selected for each circuit; In addition to the above cases, three core cables shall be selected; The three core cable can be of general turnkey type or the stranded structure of three single core cables.

4. For high-voltage AC single-phase power supply circuits such as electrification, two core cables or two single core cables shall be selected for each circuit.

5. For low-voltage DC power supply circuit, two core cable should be selected; Single core cable can also be selected. Single core cable should be selected for HVDC transmission system; Coaxial two core cable can also be selected for underwater laying in Lake, sea, etc.

6. In the 110kV three-phase power supply circuit, three single core cables can be selected for each circuit, except that three core cables can be selected when they are laid in places such as lakes and sea water and the cable section is small. For three-phase power supply circuits above 110KV, three single core cables shall be selected for each response.