Why can’t single-core power cables be armored with steel strips? ? ?

2010-02-27View Original

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Why can’t single-core power cables be armored with steel strips? ? ?

Reply #22010-02-28

The last edit to this post was made by mlxx2008 on 2010-2-28 at 09:05. My understanding is that since it is a power cable, a large current flows through it during use, which generates a strong electromagnetic field； If it has only one core, then there will be no electromagnetic field in the opposite direction; as a result, there is no cancellation or significant reduction of the electromagnetic fields. In such a case, if a metal shield is added around the cable, the magnetic field generated by the current will pass through this metal shield, causing large eddy currents to form within the shield and leading to severe heating. Therefore, power cables with a single core do not come equipped with a shield.

Reply #32010-02-28

It’s the same principle as why single-core wires cannot be placed in iron tubes – it will cause heating.

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