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A multi-core cable is called a multi-core cable. 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-circuit 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 is required, and the occupied space and laying conditions are limited, the single-core cable cannot be used 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-circuit 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 is required, and the occupied space and laying conditions are limited, the single-core cable cannot be used conveniently.

Armoured cable: A layer of metal or other substances is added to the outer insulation layer of the cable (depending on the environment in which the cable is laid), so as to protect the cable from being damaged by external mechanical forces, corroded by chemical gases, etc. One layer is the armor layer, and such a cable is called an armored cable. 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 susceptible to mechanical damage and corrosion. It can be laid in any way, and it is more suitable for direct burial in rocky areas.

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

The role of the armored cable: electrical wire products for the transmission of 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. It also depends on whether the cable itself has trademarks, specifications, voltages, etc. It also depends on the cross section of the copper core of the wire. The high-quality red copper has a bright color and a soft 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 1.8~1.9KG per 100m, and the plastic insulated single-strand copper core wire of 2.5 square meters has a weight of 3 per 100m. ~3.1kg. Poor quality cables are underweight, either not long enough, or have too much copper impurities in the wire.

3. To try: Take a length of wire and bend it repeatedly. The wires that are soft to the touch, have good strength resistance, are plastic or rubber-like, and have no cracks on the wire insulation are generally national standard wires.

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

5. Look at the copper quality: the copper core of the qualified copper core wire is purple, shiny and feels good. Inferior copper cores are purple-black or yellowish, white, with many impurities, poor mechanical strength, and insufficient flexibility, and will break with a little force. And there are often short wires in the wires. We generally peel off the wire ends and scribble on the white paper with the copper core. If there is black residue on the white paper, it means that there are more impurities in the copper core, which is a non-marking line.