Wire harness wrapping is also called wire harness outer protection, which is used to protect the wire harness. The outer protection of the wiring harness mainly includes corrugated pipes, casings, tapes, brackets, etc. Depending on the material, it can be divided into several sub-categories, such as PVC tape, abrasion-resistant tape, flannel tape, etc.

1. Selection of bellows

The main features of bellows are good wear resistance, high temperature resistance, flame retardant and heat resistance in high temperature areas. The temperature resistance of the bellows is generally between -40°C and 150°C. Its materials are generally divided into PP and PA. PA material is superior to PP material in terms of flame retardancy and wear resistance, but PP material is superior to PA material in bending fatigue resistance.

Due to the harsh working environment such as engine wiring harnesses, open or closed corrugated pipes with high flame retardancy, water resistance and high mechanical strength should be used.

The working environment of the front cabin wiring harness is also relatively poor, and most of the branch lines are also wrapped with flame retardant bellows.

The chassis wiring harness has more contact with the body and is wrapped with a corrugated tube to prevent the wiring harness from being worn.

The advantages of open bellows: production, wear resistance, flame retardant, high temperature resistance (for placing bellows open clamps).

Advantages of closed bellows: wear resistance, flame retardant, high temperature resistance, waterproof; Disadvantages: the wire harness manufacturing process is time-consuming.

2. PVC pipe selection.

PVC pipes function similarly to corrugated pipes. PVC pipes have good flexibility and bending deformation resistance, and PVC pipes are generally closed, so PVC pipes are mainly used for the branch of wire harness bending to make the wire transition smoothly. The heat resistance of PVC pipes is not high, generally lower than 80 ℃.

Some branch wires of the front cabin harness are also wrapped in flame retardant PVC.

Advantages: wear resistance, high water resistance, flexibility and good bending deformation resistance.

Disadvantages: The wire harness manufacturing process is time-consuming, generally lower than 80 °C.

3. The choice of tape

The tape plays the role of bundling, abrasion resistance, insulation, flame retardant, noise reduction and marking in the wire harness.

Harness tape is generally divided into PVC tape, flannel tape and cloth tape.

PVC tape is wear-resistant and flame-retardant; the temperature resistance is around 80 °C, the noise reduction is not good, and the price is cheap.

Velvet tape and cloth tape material is PET. The velvet tape has better wrapping and noise resistance, and the temperature resistance is around 105 ℃

Cloth tape has good abrasion resistance and can withstand high temperature of about 150 °C.

The common features of flannel tape and cloth base tape are poor flame retardancy and high price.

The instrument line has a small working space and a better environment. It can be wrapped with tape or wrapped with flowers.

Door line and ceiling line have small working space and can be wrapped with tape, and some branches can be wrapped with industrial plastic cloth; thin ceiling line can be directly attached to the body with sponge tape.

4. Selection of braided tube

The braided tube has the characteristics of wear resistance, high temperature resistance, and prevents the wear of other parts, and the braided tube with braided metal wire is more resistant to electromagnetic interference. For use in unavoidable interference or high electromagnetic interference locations. The disadvantage is the high cost.

5. Selection of heat reflective tape/pipe

Heat reflective tape/pipe can prevent heat radiation, suitable for high temperature areas, inevitably used in high temperature. The disadvantage is the high cost.

6. the choice of plastic bracket

The plastic bracket is customized with the vehicle, which can meet the requirements of special installation controls and path routing, with strong positioning ability, beautiful wiring harness layout, wear resistance and temperature resistance, and the disadvantage is high cost.