How should the power supply DTU be wired with strong and weak current wires isolated?

The cabling for isolated DTU power and low-voltage circuits must adhere to the principles of zoning, spacing, and shielding. Power lines (power lines, power modules) and low-voltage lines (signal lines, control circuits) should be laid out separately, with at least a 10mm insulating strip in between. Power and low-voltage cables should cross perpendicularly; if parallel crossing is necessary, the spacing should be greater than 30cm, or a metal partition should be used. Power cables should use shielded cables with both ends of the shield grounded; low-voltage cables should use twisted-pair shielded cables with only one end of the shield grounded. On the PCB, power and low-voltage areas should be separated by a ground plane and connected via optocouplers or isolation transformers. Safety distances must meet the requirements of Creepage ≥ 5.5mm and Clearance ≥ 3.2mm (220VAC). Isolated cabling can reduce coupling noise by more than 30dB.