How to connect the ground wire of the AC-side cabinet

The AC-side cabinet ground wire should be connected to a grounding busbar or terminal that is securely bonded to the cabinet frame, ensuring low-impedance, reliable grounding for safety and EMC compliance.Grounding the Cabinet FrameUse a Grounding Busbar or Terminal: Install a grounding busbar inside the cabinet, fixed to the metal frame with multiple screws to ensure good electrical contact. If the cabinet is painted, remove paint at the contact points to expose bare metal for proper conductivity .Connect the Ground Wire: Attach the AC-side ground wire to the grounding busbar or a dedicated grounding terminal using a compression lug or terminal block. Ensure the connection is tight and secure to maintain a low-resistance path .Sizing the Ground Conductor: The cross-sectional area of the grounding wire or busbar should be at least half the cross-section of the supply cable to handle potential fault currents safely .Grounding Hinged Panels and DoorsHinged doors or installation plates with electrical devices must be grounded separately. The hinge alone is not a reliable grounding path. Use a dedicated bonding jumper from the backpanel or busbar to the door or plate .Cable Shielding and EMC ConsiderationsFor shielded control or power cables, connect the cable screen to the cabinet frame as close as possible to the terminals to minimize electromagnetic interference. A 360° grounding of the shield is recommended for best EMC performance .Safety NotesAlways maintain a protective earth (PE) connection from the device to the PE busbar, even if the cabinet frame is grounded. Body grounding does not replace the PE conductor .Ensure all metallic components inside the cabinet, including unpainted or zinc-coated surfaces, are electrically bonded to the grounding system . By following these steps, the AC-side cabinet will have a reliable, low-impedance ground connection, ensuring both personnel safety and proper operation of the electrical system.