How should the shielding of the power cable for a concentrator be grounded?

If the input and output power cables of a concentrator have shielding, proper grounding can constrain their electric and magnetic field radiation. For three-phase four-wire or single-phase power lines, if shielded power cables are used, the shielding layer should be grounded at both ends, i.e., both the concentrator end and the power supply end (or load end) should be grounded. This is because power lines have low frequencies, and grounding at both ends will not create a significant ground loop. When grounding, the shielding layer should achieve a 360° circumferential connection through a cable gland or a dedicated grounding clamp, and the grounding wire should be short and thick (cross-sectional area not less than 1/2 of the phase wire). Inside the concentrator, the grounding point of the shielding layer should be selected at the grounding terminal of the power filter or a dedicated grounding post on the chassis. If the cable is very long (>30m), consider adding an additional grounding in the middle. For motor cables output by frequency converters, the shielding must be grounded at both ends. Proper shielding grounding can reduce radiated interference from power cables by more than 15dB.