Basic Requirements And Matters Needing Attention Of Grounding Wire Of Power Distribution Cabinet

With the continuous development of my country's construction industry and power system, strengthening the power supply and grounding design of buildings plays an important role in the construction of buildings and the safety of residents' lives.

1. What matters should be paid attention to for the grounding wire of the power distribution cabinet?

(1) The grounding wire of the components in the cabinet should be placed exclusively. If the parallel method is used, it may cause danger due to a short circuit at a certain point.

(2) The connection line between the door and the cabinet is connected by galvanized shielding tape. Because of the flexibility of the electrical tape, it is best to be safe and naked. In addition, the processing of the shielding tape end should be crimped with an O-type copper connector, and the shielding tape should not be directly fixed. When fixing, use an inverted washer to prevent looseness and poor contact.

(3) When there is grounding of electronic components or grounding of shielded wires in the cabinet. The grounding copper plate of such weak current signals is insulated from the bottom plate by an insulator, but a grounding wire that is reliably connected to the main grounding row should be reserved. Ground wire connections to increase the flexibility of the signal grounding system.

2. What are the basic requirements for the grounding wire of the power distribution cabinet?

(1) The contact surface of the grounding device must be smooth and flat to ensure good contact, and there should be measures to prevent loosening and rusting.

(2) The secondary coil of the current transformer should be grounded separately and reliably.

(3) Components with metal casings must be grounded.

(4) When installing electrical components on the metal panel with dumpling chains, a safety jumper should be set between the panel and the metal box.

(5) On covers, doors, shutters and similar parts, if no electrical equipment is installed, the usual metal screw connections and metal dumpling chain connections are considered sufficient to ensure the continuity of the circuit.