How to connect the chassis ground of a power line carrier PLC to the power ground?

The connection between the PLC chassis ground and the power ground must be considered comprehensively according to safety regulations and EMC requirements. For Class I equipment, the chassis ground must be reliably connected to the protective earth (PE) using a low-impedance conductor (cross-sectional area ≥ 1.5 mm²) connected to the grounding terminal. The power ground (DC power supply ground) and chassis ground should be connected through a high-voltage capacitor (e.g., 1 nF/2000V) or a resistor (1 MΩ) to provide a high-frequency noise discharge path while ensuring DC isolation. The connection point should be selected near the power inlet, using a star grounding structure to avoid ground loops. From an EMC perspective, the chassis ground can act as a shielding layer, conducting radiated noise to the ground. During testing, a grounding resistance tester should be used to measure the connection resistance, ensuring it is less than 0.1 Ω. A withstand voltage test (1500VAC/60s) should also be performed to verify insulation performance. With proper connection, the system can simultaneously meet safety regulations and EMC standards, with a grounding impedance of less than 4 Ω.