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Why are power cables from mixture of aluminium and iron,not copper any more? Answered

please give me the right answer thats for my assigment

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you could do your own research as well.


Transmission cables here in the UK have been aluminium and a steel core for a long time - in fact all the time - Lower cost - Lower resistance - lower weight and greater tensile strength all are factors

.  Same here in the US. We've been using ACSR (Aluminum Conductor Steel Reinforced) for decades because it's cheaper than Cu, doesn't stretch as much, &c.

http://en.wikipedia.org/wiki/Power_lines#Overhead_transmission