Process calculation The length of the wire directly affects the progress of the processing and the performance of the wire harness. There are often long and short wires during processing. If the size is too short, it does not meet the drawing and loading requirements, and the processing personnel need to lengthen or change the wire, which is time-consuming and labor-intensive; if it is too long, it is easy to cause difficulty in finishing and bulging during the processing and finishing of the wire harness, resulting in poor appearance of the wire harness. Eddy currents and easy heat generation after the car will affect the service life of the wiring harness. It can be seen that the wire size is very important for the wire harness process.