How to reduce coupling when routing the wiring harness of the power measurement switch (PMS)?

The routing of internal wiring harnesses (power lines, signal lines) within the PMS cabinet has a significant impact on electromagnetic coupling; improper routing increases crosstalk and radiation. The cabling principles for reducing coupling are: classification, layering, and separation.

Classification: Classify wiring harnesses according to their interference characteristics into categories such as high-voltage, low-voltage, and communication.

Layering: Install different cable trays or racks within the cabinet, laying different categories of wiring harnesses on separate layers; for example, high-voltage wires on the bottom layer and low-voltage signal lines on the top layer.

Separation: Within the same type of wiring harness, interference source lines (such as inverter output lines) and sensitive lines (such as sampling lines) should be routed separately, with a minimum parallel spacing of more than 10cm; perpendicular crossings are unavoidable.

All wiring harnesses should be routed as close as possible to the metal cabinet wall or grounded metal plate to utilize the mirror effect to reduce loop area. Wiring harnesses themselves should be neatly bundled to avoid forming large loops. For long-distance parallel routing, grounded metal partitions can be installed in the middle. Through standardized wiring harness routing management, coupling interference between wiring harnesses can be reduced by 10-20dB, significantly improving the overall EMC performance of the system.