Function Of Wire And Cable Braid

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.

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

3. The shielding function of safety protection is to braid copper wire outside the insulation of the main core and make good contact with the ground core or use it as ground wire, which can respond to the leakage in time, 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.