The correct composition of wires and cables is composed of three parts: a conductor core, an insulating layer, and a protective layer (sheath layer); in detail, it is divided into a conductive core, an inner semiconducting layer, an insulating layer, an outer semiconducting layer, and copper shielding. , filler, inner lining, double steel belt protective layer, and outer protective layer these complex parts.
The outer layer of the wire and cable is generally rubber or rubber synthetic sleeve. The function of this layer is insulation, and it also protects the cable from damage. Then it is divided into high-voltage or low-voltage cables. If it is high-voltage, there will be a layer of resin-like filler in it, which is used for insulation. In high-voltage cables, this layer is the main part of the insulation, and low-voltage cables do not have this layer. , and then there will be something similar to the same ribbon wrapped inside, this is to stabilize each core of the cable and fill the gap in the middle. Below, Lan Cable Manufacturers introduces the role of the shielding layer of wire and cable:
1. Because the current passing through the wire and cable is relatively large, a magnetic field will be generated around the current. In order not to affect other components, a shielding layer can shield this electromagnetic field in the cable.
2. It can play a necessary grounding protection role. If the core wire of the cable is damaged, the leaked current can flow along the shielding layer like a grounding grid, which plays a role in safety protection. Control cables are used in many places, especially the control cables of computer systems. The shielding layer here is used to shield external influences, because the current itself is very weak, and it is very afraid of the influence of external electromagnetic fields.