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Because the steel strengthens the cable

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13y ago

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Why in high voltage electricity cables the current is carried by aluminum but the cable has a core of steel?

The reason for this is that aluminum has much higher electric conductivity than steel, but otherwise its mechanical properties are much worse. Steel core actually carries a cable.


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How can I connect two steel cables together?

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What is purpose of the steel core in some large overhead conductor?

The wire you refer to is ACSR. Aluminium Conductor Steel Reinforced. The steel core is used to give the wire structural strength. When the conductor is spanned across great distances between poles or towers the total weight of the conductor between spans would be too much for just the aluminum wire to support. The steel center core is also known as the cables messenger.