Function Of Wire And Cable Braid

Wires and cables are mainly composed of three basic structural elements: conductor core, insulating layer and sheath layer.

The protective covering layer outside the insulated core or cable core is called the protective layer of the cable (the protective covering layer outside the protective layer is called the outer protective layer). From the perspective of wire and cable sheath, braiding is one of many kinds of sheath or outer sheath of wire and cable. However, according to the materials used in the wire and cable braid and the different parts of the braid in the wire and cable structure, the role of the braid is different.

Today's Xiaobian will introduce you to the weaving layers of different materials

What role does it play in wires and cables

Function of fiber braid

■ for wires, fiber braid is a form of light protective layer. Its main function is to protect the insulation from or less from the erosion of various light, heat, moisture, low temperature, acid-base gas and external mechanical force, so as to ensure the safe operation of wires.

■ for cables, the fiber braided layer is often in the middle of the protective layer to enhance the tear strength of the protective layer. For example, the reinforced sheath is to add cotton yarn, hemp and other fiber braided layers in the middle of the rubber or plastic protective layer to improve the strength of the protective layer.

Function of metal braid

Metal braid mainly includes copper wire braid and steel wire (iron wire) braid.

■ the main functions of copper wire braid are:

1. Shielding effect against electromagnetic interference, such as copper wire braided control cable, etc.

2. Eliminate the shielding effect of surface potential of power cable, which can bind power line and eliminate induced electricity, such as the total shielding of high-voltage cable.

3. The shielding effect of safety protection is to braid copper wire outside the insulation of the main core and make good contact with the ground core or as ground wire, which can timely reflect the leakage, such as shielded mining cable.

■ the main functions of steel wire weaving are:

1. Mechanical protection, such as marine power cable CF31.

2. Bear longitudinal tensile breaking force, such as magnetic cables WC - GC and WCT for marine geological exploration.

3. Magnetic field shielding.

It can be seen from this paper that the role of the braid of fiber, copper wire and steel wire is obviously different. Therefore, we should select the wire and cable with appropriate braid according to the use requirements.