The wiring harness processing engineering technology team mainly includes: product dimension drawings, product BOM details and quantities, mechanical and physical properties of product raw materials in customer drawing design. The mechanical and physical properties of wire harness processing mainly include the bending frequency of raw materials, terminal tension testing, and resistance value of raw materials. The bending frequency and terminal tension testing can refer to the wire harness processing documents of Dadaokang. How to design the resistance value of raw materials in drawing design for Dadaokang wire harness processing.

In the design of wire harness processing drawings, the impedance of wires is mainly related to the resistivity, cross-sectional area, and length of conductors and insulators. According to the law of resistance R=π L/S, the insulation impedance and conduction impedance are calculated.

1. Wire materials are generally divided into bare copper and tin plated copper wire. According to a constant temperature of 20 ℃, the resistivity of bare copper is 0.0178 Ω * mm ²/m, and the resistivity of tin plated copper wire is 0.0172 Ω * mm ²/m

2. The outer coating of the wire is generally made of PVC material, with a resistivity of 108 Ω * m.

3. Calculate the conduction impedance and insulation impedance of the wire based on the conductor area processed according to customer requirements.

4. The terminal harness technology team must specify the terminal tension during the design drawing process.