The multi core cable is called multi-core cable. Common multi-core wires are: 10 core, 12 core, 16 core, 24 core, 32 core, etc. Multi core cable is an upgrade of single core cable. Because of the increasing situation of three-phase four wire power supply, three-phase five wire power supply and multi circuit power supply in actual use, the requirements for space occupation and laying occasions are also higher and higher. When multiple and multi-layer laying are needed, and the space occupied and laying conditions are limited, single core cable can not be easily used. Therefore, multi-core cable is developed and quickly entered into the field of power application, and is accepted and used by the majority of users. Because of the increasing situation of three-phase four wire power supply, three-phase five wire power supply and multi circuit power supply in actual use, the requirements for space occupation and laying occasions are also higher and higher. When multiple and multi-layer laying are needed, and the space occupied and laying conditions are limited, single core cable can not be easily used.

Armored cable: the outer insulation layer of the cable is added with a layer of metal or other substances (depending on the environment of cable laying), so as to protect the cable from being damaged by external mechanical forces, corroded by chemical gases, etc. this layer is the armor layer, such cable is called armored cable. The mechanical protective layer of armored cable can be added to any structure cable to increase the mechanical strength of the cable and improve the anti-corrosion capability. It is a telephone cable designed for the area vulnerable to mechanical damage and erosion. It can be laid in any way, and it is more suitable for direct laying in rock area.

The explanation of armored cable: it is to add a layer of metal protection to the outside of the product to avoid damage to the internal utility layer during transportation and installation. In the armouring of cables, an insulating sheath is usually added outside. The materials of armored cable include steel strip, steel wire, copper tape, tinned steel wire, etc. their selection is mainly based on the customer's use environment and requirements.

The function of armored cable: electrical wire rod products used for transmission of electric energy, information and electromagnetic energy conversion.