What inspections are generally required for high-voltage ring main units

1. Whether the inside and outside of the cabinet are clean, free of dust, water stains and other foreign matter, and the door is kept tight and has good sealing.

2. Check all wiring points, equipment and components to confirm that all wiring is complete and standardized, with no omissions or errors. Wire in the correct order, usually from the power supply end to the load end.

3 Ensure that the selection and use of cables, terminal blocks and accessories comply with regulations and are consistent with those required in the design drawings

4. The stripping length of the wire must be appropriate to ensure good contact without affecting the wiring quality due to being too long or too short. When the wires of the AC circuit pass through the metal partition, all phase and neutral wires of the circuit should pass through the same hole. Only one wire is allowed to be connected to each terminal (two wires are allowed to be connected if necessary). After completion, check to ensure that the wiring is Is it reliable?

5. The surface coating of the busbar (such as nickel plating and painting) should be uniform and free of flow marks. There should be no cracks or wrinkles larger than 1 mm at the bends of the busbar. The surface should be free of peeling, hammer marks, pits, burrs, etc.

6. Check that the joints are tight and not loose; the bolt joints are tightened in place.

7. The insulation layer of the cable should be intact, and the wiring should have sufficient insulation protection.

8. Identification of wiring points: Each wiring point must be clearly marked to facilitate subsequent maintenance and inspection.

9. Whether the function of the ring network cabinet is normal, such as whether the switch operation is flexible, whether the indicator light is normal, etc.

10. Inspection of protective covers, grounding protection devices and other protective equipment of terminal blocks.

In addition, various tests should be passed in advance before leaving the factory, such as insulation resistance test, AC and DC withstand voltage test, short circuit test, etc., to ensure the safety of product use and compliance with specified quality requirements.

In order to ensure that we provide customers with high-quality, high-security products, a qualified ring main unit often requires multiple tests and multi-faceted inspections. Good products are our best advertisement.