Recently I saw a power line with 2 wires (hold on). Only one AC power line and one ground wire on top. If I understand power correctly you need at least 2 wires to make a circuit and power stuff. Also another question, which wires on the power line do what?
In: Technology
Three or 4 wires power lines are 3 phase transmission lines.
There is also a thick line that runs under the 3 ones that carry low voltage data like telephone or cable tv.
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