Those with more cores are called multi-core cables. Common multi-core wires are: 10 cores, 12 cores, 16 cores, 24 cores, 32 cores, etc. The multi-core cable is an upgraded version of the single-core cable. As there are more and more occasions for three-phase four-wire power supply, three-phase five-wire power supply and multi-loop power supply in actual use, the requirements for occupied space and laying occasions are also getting higher and higher. When multiple and multi-layer laying are required, and the occupied space and laying conditions are restricted, single-core cables cannot be used very conveniently. Therefore, multi-core cables were developed and quickly entered the field of power applications, and were accepted and used by the majority of users. As there are more and more occasions for three-phase four-wire power supply, three-phase five-wire power supply and multi-loop power supply in actual use, the requirements for occupied space and laying occasions are also getting higher and higher. When multiple and multi-layer laying are required, and the occupied space and laying conditions are restricted, single-core cables cannot be used very conveniently.

Armored cable: A layer of metal or other substances is added to the outer insulating layer of the cable (depending on the environment in which the cable is laid), so as to protect the cable from external mechanical force, corrosion by chemical gases, etc. One layer is the armor layer, and such cables are called armored cables. The armored cable mechanical protection layer can be added to any structure of the cable to increase the mechanical strength of the cable and improve the corrosion resistance. It is a telephone cable designed for areas that are prone to mechanical damage and erosion. It can be laid in any way, and is more suitable for direct burial laying in rocky areas.

Interpretation of armored cable: It is to install a layer of metal protection on the outermost surface of the product to prevent the internal utility layer from being damaged during transportation and installation. In the armor of the cable, an insulating sheath is usually added to the outside. The materials of the armored cable include steel tape, steel wire, copper tape, tinned steel wire, etc. The selection of them is mainly based on the customer's use environment and requirements.

The role of armored cables: electrical wire products used to transmit electrical energy, information, and electromagnetic energy conversion.

How to distinguish the quality of the cable

1. Look at the appearance and certificate: We look at the certification certificate of the quality system required by the manufacturer to see whether the certificate is standardized; whether there is a factory name, factory address, inspection stamp, production date, etc. And it also depends on whether the cable itself has a trademark, specification, voltage, etc. Also look at the cross section of the copper core of the wire. The high-quality copper is bright in color and soft in color.

2. Weighing: Good quality wires are generally within the specified weight range. For example, the commonly used plastic insulated single-strand copper core wire with a cross-sectional area of ​​1.5 square meters has a weight of 1.8~1.9 kg per 100m, and a plastic insulated single-strand copper core wire of 2.5 square meters has a weight of 3 per 100m. ~3.1kg. Poor quality cables have insufficient weight, either the length is not enough, or the copper core of the wire has too much impurities.

3. Try: Take a piece of wire head and bend it repeatedly. The wires are soft to the touch, strong, plastic or rubber-like and have no cracks on the wire insulation. Generally, the wires are national standard wires.

4. Look at the price: Because poor wires are generally produced with bad materials to reduce costs, price is generally one of the important means of distinguishing.

5. Look at the quality of copper: the copper core of the qualified copper core wire is purple-red, shiny, and feels good. Inferior copper cores are purple-black or yellowish, white, with a lot of impurities, poor mechanical strength, insufficient flexibility, and will break if you apply a little force. And there are often short wires in the wires. We usually peel off the wire head and scratch the white paper with the copper core. If there is black residue on the white paper, it means that the copper core has more impurities and it is a non-marked wire.