> It feels like everybody is writing like power cables were bare metal
> wires
> with nothing covering them.
That's how they are actually:
"While overhead lines are usually bare conductors, rarely overhead insulated
cables are used, usually for short distances (less than a kilometer)."
from
http://en.wikipedia.org/wiki/Overhead_power_line
Insulating them for longer runs just needlessly reduces the amount of
current they can take without overheating.
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