Birds on a voltage wire
How come when birds sit on a wire they don't get fried?
Same reason the wire itself does not get fried! Nothing bad
happens as long as the two wires that have the big voltage
difference between them do not meet. If the bird stretches out
its wings and touches both wires, it might be in trouble. However,
those electrical wires are usually well insulated so even this
would not be a problem, except possibly on those really high voltage
lines like the ones that got knocked over in Mississippi recently.
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Update: June 2012