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Mostly aluminum because they are ran in free air and that changes their ampacity rating enough for aluminum to be more economical than copper. Gold has a higher ampacity rating than either al. or copper but it is to valuable to leave hanging in the air.
Wiki User
∙ 16y ago
Wiki User
∙ 14y agoCopper is used in household wiring. Twisted bundles of Aluminum with a steel center wire are used for high power systems. Stranded Aluminum wire "drops" bring power to most homes from the transformer.
Wiki User
∙ 12y agoFor high voltage lines aluminum is used. Copper is actually a better conductor, but aluminum has the advantage of being lighter, as well as cheaper.
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Are overhead power lines insulated?
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.
What are the materials added in electrical overhead lines?
Overhead electrical lines are usually made of aluminum, and some have a steel strand added which is used to give the conductor more strength (not to carry current).
When do special precautions need to be taken when working near overhead electric power lines?
Usually you would want to stay at least 10 feet away from power lines. Any conductive material you are working with also has to be at least 10 feet away (metal extension ladder).
To reduce power losses in transmission lines the voltage is made?
Much higher.
What is underground power transmission?
power cables under ground rather then overhead.
Where does electricity go after it goes to the wooden overhead lines?
Overhead distribution lines are made of aluminium not wood.
Distancebetween overhead power lines and houses?
20 feet.
Are overhead power lines insulated?
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.
What are old powerlines along railrd tracks ,made of?
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
Is it safer living by buried power lines or overhead lines?
It is safer living by buried power lines because they won't fall on your house or car in heavy winds or ice storms.
What should you lookout for when launching a sailboat with raised mast?
Overhead obstacles - such as power-lines or bridges.
What are the materials added in electrical overhead lines?
Overhead electrical lines are usually made of aluminum, and some have a steel strand added which is used to give the conductor more strength (not to carry current).
In long distance overhead lines why voltage increase?
to reduce current and the resulting I2R waste of power.
What has the author William T Taylor written?
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
How does expansion affects the setting up of overhead electrical wires?
Heat makes overhead power lines expand and hang down into trees and other such things, causing them to short circuit
Why is copper used to make electical wiring but is not usually used to make overhead power lines?
Weight and cost factor.
Why power lines are made up of aliminum?
Power lines are made of aluminum, because they are exceptional conductors of both heat and electricity.
