Electrical Design | Can two 2.5 square wires be twisted together equal to 5 square wires?

Two 2.5m㎡ wires can be twisted together, which is approximately 4.5m㎡. The premise is that the material should be the same and the length should be the same. It is common for two wires with the same loading surface to be combined in work maintenance.

Generally, it is not recommended and will not be used below a small loading area (10m㎡). In the most frequently used places, power distribution is sometimes solved with two cables due to the difficulty in construction of large-size cables. As long as the material and length are the same, the ampacity of two conductors with the same surface can reach that of one conductor.

To know whether two 2.5 square wires are twisted together is equivalent to 5 square wires, first of all, you must know that there is no 5 square power cord, only 2.5/4/6/10/16 square power cord specifications. As for the parallel connection of two 2.5-square-meter power cords, although it has not been tested, theoretically speaking, it should be equivalent to the electrical power that a 6-square-meter power cord can withstand.

For example, a 2.5 square copper core wire can withstand a maximum electrical power of 4,000 watts for concealed wiring, and a 6 square meter copper core wire can withstand electrical power within 7,500 watts. And two 2.5 square copper core wires connected together can theoretically withstand electrical power within 8000 watts. But this is only a theoretical speculation. In actual use, it is best to use it as a 4 square copper core wire. That is, when the open wire is laid, the electrical power is controlled within 7200 watts. When the dark wire is laid, the maximum power of the electrical appliance is controlled within 5500 watts. This is more secure, and it is necessary to ensure that the parallel joints are firm and reliable, so as to ensure safety.

Occasionally, two wires or even multiple wires are used in parallel. For example, a 220KV high-voltage transmission line is two wires connected in parallel to one phase. together.

If it is 500KV high-voltage transmission, there are still four wires connected to one phase.

Therefore, two wires with a cross-sectional area of ​​2.5 square millimeters can be twisted together and shunted in parallel. In theory, it can replace a wire with a cross-sectional area of ​​5 square millimeters.

But in the actual situation, the biggest problem is that the eddy current heating may be generated when the three-phase load is unbalanced, which will affect the normal use.

If two 2.5 square wires are twisted together, it will carry more current than a 5 square wire. The reason is that when the plates are together, the surface area increases, which is more conducive to heat dissipation, and the carrying capacity will also increase.

In the wire standard specification, there are no 5 square wires, but 4 square and 6 square wires, and the carrying capacity of the two 2.5 square wires and 6 square wires is similar.

According to national regulations, wires are not allowed to be coiled, except for unbalanced three-phase electricity. Furthermore, it has a great influence on the current carrying capacity of the wire. Since there are fixed specifications, it is better not to be opportunistic.

There are also the same things, which cannot be exactly the same. If the two wires are twisted together forcibly, it is difficult for the two wires to be evenly twisted together, and their joints cannot be properly handled.

Therefore, if the above two points cannot be achieved, in order to be able to use safely, two wires of the same specification are not recommended to be twisted together.

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