How to seal the shielding at the concentrator cable inlet?

The entry and exit points of cables into and out of the concentrator enclosure are weak points in shielding and must be effectively shielded and sealed. The standard practice is to use high-shielding cable gland connectors or filter connectors. For shielded cables, cable gland connectors with metal sheaths and flexible toothed washers should be selected. During installation, tighten the cable to deform the washer and achieve 360° circumferential contact with the cable shielding layer, while ensuring good contact between the gland sheath and the metal surface of the enclosure opening. For multi-core unshielded cables, through-panel connectors with filtering capabilities (such as D-Sub with filtering) should be used, with the connector sheath connected to the enclosure panel with low impedance. If there are many cables, they can be centrally connected through a high-shielding junction box (grounded metal box). It is forbidden to directly pass cables through simple plastic holes. After all entry point treatments are completed, the goal is to control the leakage at the cable entry points to a level at least 10 dB lower than the radiation from the enclosure itself.