How should the shielding of power cables for a power DTU be grounded?

The grounding of DTU power cable shielding should be selected based on the noise type and frequency. For low-frequency noise (<1MHz), the shielding layer should be grounded at one end, typically at the receiving end, to avoid ground loops. For high-frequency noise (>1MHz), the shielding layer should be grounded at both ends to reduce shielding impedance, but the ground potential difference must be small. Use shielding clips or connector metal shells to terminate the shielding layer 360 degrees to the shell. The grounding wire should be as short as possible, less than λ/10. During testing, the shielding layer transfer impedance should be measured and should be less than 100mΩ/m. Proper grounding can improve shielding effectiveness by 30dB.