In the usual wiring harness design, the cross-sectional area of the wire can be directly selected according to experience. Generally, electrical equipment that works for a long time can choose a wire with an actual current carrying capacity of 60%, and electrical equipment that works for a short time can choose an actual current carrying capacity of 60%~100%. wire. That is, the common sensor signal line, generally choose the wire with a cross-sectional area of 0.5 mm2; the power line or the ground wire, generally choose a wire with a cross-sectional area of 2.5 mm2.
The selection of wire temperature resistance grade is based on the working ambient temperature of the engine wiring harness, combined with commercial vehicle automotive grade standards, requiring long-term work of ordinary wires
Temperature -40~125 ℃. If there is a special use environment, it is necessary to select a special type of wire. For example, when the heating device is working, the radiation temperature around the heating side of the intake air of the engine reaches more than 200 °C, and a high temperature resistant wire can be selected.