Car harness from the function points:
1: There is a power line that carries the power of the drive actuator (actuator)
2: Pass the signal line of the sensor input command
The power line is a thick wire that carries high current, and the signal line is a fine wire (optical fiber communication) that does not carry electricity. For example, the signal circuit has a conductor cross-section of 0.3,0.5 mm2.
In the motor, the implementation of the conductor with a cross-sectional area of 0.85,1.25 mm2, and the power circuit with a cross-sectional area of 2,3,5 mm2; and special circuits (from the idea, the alternator, the engine ground wire, etc.) are 8 , 10,15,20 mm2 different specifications.
The larger the cross-sectional area of the wire, the greater the current capacity. The choice of wire, in addition to considering the electrical function, but also by the physical function of the vehicle when the constraints, so its wide range of options