The division and design of bus wiring harnesses take large-scale bus wiring harnesses as an example. Generally, the whole vehicle wiring harnesses of passenger cars can be divided into: dashboard wiring harness, chassis wiring harness or underframe wiring harness, roof wiring harness, ABS wiring harness, and air conditioning wiring harness. , battery power wiring harness, starter wiring harness, battery ground wiring harness, etc. The division of the bus wiring harness is more flexible, and can be divided according to the electrical configuration of the vehicle and the layout of the electrical system. The arrangement space of the wiring harness is sufficient, and the fixing is easy to achieve. Because a large part of the bus wiring harness is located in a relatively harsh working environment, the binding protection method of the wiring harness is relatively strict, and it needs to be protected from dust, water, high temperature, wear, etc. Because the wiring space is not limited, Therefore, the use of bellows-sealed wrapping is more common.