The wiring harness is defined by pressing copper from the contact terminal (connector) after crimping and wiring and cables, and then applying pressure on the outer plastic insulator or metal shell to form an assembly connected to the wiring harness strapping circuit. Trajectories traffic harness is the primary network circuit of trajectories.

1. The long service time of wire harness and aging of wire lead to the rupture of insulation layer, the obvious decrease of mechanical strength, the open circuit, short circuit and grounding between wires, and then the wire harness is burnt out;

2. Track traffic harness terminal deformation, oxidation, formation of poor contact, etc., will cause electrical equipment can not work properly. The wiring harness is damaged due to the fault of electrical equipment;

3. When the electrical equipment has overload, short circuit, grounding and other faults, it may cause beam damage.

During the installation or maintenance of track parts, the metal objects will crush the electric beam, causing the insulation layer of the electric beam to crack; the lead orientation of the electrical equipment is wrong; the orientation of the electric wire harness is improper; the positive and negative leads of the battery are connected reversely.

The main body of the trajectory circuit network is the trajectory traffic harness, which connects the electrical and electronic components of the trajectory and makes them function. The track harness is composed of wires, connectors and wrapping tape. It should ensure the transmission of electrical signals, ensure the reliability of the connecting circuit, prevent electromagnetic disturbance to the surrounding circuit, and eliminate the short circuit of electrical appliances.

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