How to ensure the grounding of the power DTU chassis meets the power EMC requirements?

DTU power EMC-compliant chassis grounding must meet safety specifications and shielding requirements. For Class I equipment, the chassis must be reliably connected to the protective earth (PE) using a yellow-green conductor (cross-sectional area ≥ 1.5 mm²) connected to the grounding terminal. The grounding resistance should be less than 0.1 Ω. From an EMC perspective, the chassis, as a shield, requires low-impedance grounding to discharge noise. A high-frequency capacitor (100 nF) should be connected in parallel with the grounding path, or a metal spring should be used to ensure good high-frequency grounding. During testing, grounding continuity tests (resistance < 0.1 Ω) and insulation resistance tests (> 100 MΩ) are performed. Chassis grounding that meets power EMC requirements ensures both safety and immunity.