Precautions for Wiring Copper Busbars in Power Distribution Cabinets

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When wiring the copper busbars in power distribution cabinets, safety, reliability, and standardization need to be fully considered. The following are the detailed precautions:

### Preparation Work
- **Material Quality**: Select copper busbars with qualified quality. Their surfaces should be smooth, free from cracks, blowholes, and other defects. Ensure that the supporting connecting parts such as bolts, nuts, and washers are of excellent material, with sufficient strength and electrical conductivity.
- **Specification Matching**: According to the rated current, voltage level of the power distribution cabinet, and actual usage requirements, choose copper busbars of appropriate specifications. The cross - sectional area of the copper busbars should meet the circuit current - carrying capacity requirements to avoid safety accidents caused by overloading.
- **Tool Inspection**: Prepare suitable installation tools such as wrenches, screwdrivers, crimping pliers, etc., and ensure that the tools are intact and their accuracy meets the requirements.

### Wiring Process
- **Appearance Treatment**: Before wiring, clean and treat the surface of the copper busbars to remove impurities such as oxide layers and oil stains to reduce the contact resistance. You can sand the surface of the copper busbars with sandpaper and then apply conductive paste to enhance electrical conductivity.
- **Bending and Shaping**: Bend and cut the copper busbars correctly according to the layout and installation requirements of the power distribution cabinet. Pay attention to the angle and radius during bending to avoid cracks or creases, which may affect the mechanical properties and electrical conductivity of the copper busbars.
- **Firm Connection**: When using bolt connection, choose bolts of appropriate specifications and ensure that the tightening torque meets the requirements. Generally, the tightening torque should be moderate. If it is too small, it will cause poor contact; if it is too large, it may damage the copper busbars or connecting parts. At the same time, install flat washers and spring washers between the bolts and the copper busbars to prevent the bolts from loosening.
- **Correct Phase Sequence**: Wire strictly in accordance with the phase - sequence requirements of the electrical system. Usually, the phase sequence of three - phase electricity is phase A (yellow), phase B (green), and phase C (red). Incorrect phase sequence may lead to problems such as motor reversal and equipment damage.
- **Reasonable Spacing**: Ensure that there is sufficient safety spacing between the copper busbars and between the copper busbars and other components to prevent short - circuits or discharge phenomena. The safety spacing should meet the requirements of relevant electrical standards and specifications.
- **Reliable Grounding**: The copper busbars in the power distribution cabinet must be reliably grounded to ensure the safety of personnel and equipment. The grounding copper busbars should be reliably connected to the grounding electrode, and the grounding resistance should meet the specified value.

### Inspection after Wiring
- **Electrical Performance Testing**: After wiring is completed, use professional electrical testing equipment such as multimeters and megohmmeters to test the electrical performance of the connection parts of the copper busbars, and check whether parameters such as contact resistance and insulation resistance meet the requirements.
- **Appearance Inspection**: Carefully check whether the wiring of the copper busbars is neat and beautiful, whether the bolts are tightened, and whether there are phenomena such as looseness and poor contact. At the same time, check whether the surface of the copper busbars is scratched, deformed, or otherwise damaged.
- **Power - on Trial Operation**: After ensuring that all inspections are qualified, conduct a power - on trial operation. Observe the operation of the power distribution cabinet for any abnormal heating, discharge, or other phenomena. If there are problems, stop the machine in time for inspection and handling.