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Why should copper braid be tinned? Is its current carrying capacity high or low?
Views:  Addtime:2021-10-15
Copper braided wire, copper bar and copper cable have the same effect. They can be used as copper conductors for various equipment connections, especially in some high-voltage transmission equipment. So who knows which of the three products has stronger current carrying capacity? And why do they have to be tinned?

The reason why we want to tin copper braided wires, copper bars and copper cables is mainly to prevent copper oxidation. Although copper has good conductivity, it is easy to oxidize, which will affect the conductivity. Therefore, it is generally silver plating or tin plating to prevent copper oxidation, but silver is more expensive, so tin plating slowly replaces silver plating as a trend.

The current carrying capacity of copper braided wire, copper bar and copper cable is related to many factors, such as close distance and small load. The conductor section is selected according to the heating conditions, and the current is controlled by the heating conditions of the conductor. The smaller the cross-sectional area is, the better the heat dissipation is, and the greater the current passing through per unit area is.

On the basis of safe current carrying capacity for long-distance and medium load, copper braided wire, copper bar and copper cable conductor section shall be selected according to voltage loss conditions. It is not enough for long-distance and medium load to only not generate heat, but also consider voltage loss. Electrical equipment can work normally only when the voltage at the load point is within the qualified range.


Under the condition of large load, it is necessary to select according to the economic current density on the basis of qualified safe current carrying capacity and voltage drop, and also consider the power loss. It is required that the power loss and capital investment should be within a reasonable range. In order to ensure the continuous operation of the conductor for a long time, it is also determined according to the comprehensive factors such as the limit temperature, cooling conditions, laying conditions and so on.

In general, the copper braided wire has stronger conductivity and the upper limit of safe current carrying selection under the conditions of short distance, small cross-sectional area, good heat dissipation and low temperature; However, due to long distance, large cross-sectional area, poor heat dissipation, high temperature and poor natural environment, the conductivity of copper braided wire is weaker and the lower limit of safe current carrying selection is lower.

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