>  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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