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20 feet.
Overhead power lines are insulated from ground, typically using strings of glass or ceramic insulators. The wire itself is bare, though - it does not have insulation on it. There are many different types of overhead power line, but I'm not aware of any that actually have insulation.
It is safer living by buried power lines because they won't fall on your house or car in heavy winds or ice storms.
Overhead obstacles - such as power-lines or bridges.
to reduce current and the resulting I2R waste of power.
powerlines mounted on pylons, see Overhead power line. For lines carrying information, see Overhead cable. An overhead line or overhead wire is used to transmit electrical energy to trains, trolleybuses
William T. Taylor has written: 'Overhead electric power transmission engineering' -- subject(s): Overhead electric lines 'Practical water-power engineering' -- subject(s): Hydraulic engineering, Water-power
Heat makes overhead power lines expand and hang down into trees and other such things, causing them to short circuit
Weight and cost factor.
by power lines comuters fridgeyourater cell phone battery
Parts I to III : 1980 Specification for Tubular Steel Poles for Overhead Power Lines
Power lines are used to move electrical energy from one place to another. In a simple system the power lines would connect a generator to a set of customers. For large amounts of energy thick overhead cables are used, supported by pylons. The largest pylon circuits can carry enough power to supply over a million homes.