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Because, at that voltage, the insulation does not provide any electrical isolation anyway.
AnswerAs air is being used to insulate the conductors, there's little point in providing additional insulation around the conductors which would only add extra weight and expense. Of course, insulators -in the form of glass or ceramic dishes or posts- are used provide insulation from the metal towers or wooden poles, as well as the means by which the conductors are suspended or supported.
Underground high-voltage cables are insulated which, together with the cost of providing the trench to house them and (in the case of very high voltage cables) their gas or oil cooling systems, is the reason why putting high voltage cables underground is so expensive compared with overhead. It has been estimated that the cost of undergrounding the UK's 400-kV system would, per kilometre, be equivalent to that of constructing a motorway.
What else can I help you with?
Difference between a bare conductor and a insulated conductor?
A bare conductor is a conductor that does not have any insulation covering it, while an insulated conductor is a conductor that is covered with a non-conductive material to prevent electrical contact with other objects. Bare conductors are typically used in overhead power lines, while insulated conductors are used in most building wiring applications to prevent electrical shocks and short circuits.
What are the ways of decreasing friction?
You can stand on bare ground tile or any other conductors (water, aluminum, etc.)
Can you make a sentence using the word bare?
The bone was laid bare by the scrape.
What are the colors of conductors in nonmetallic sheathed cable for 2-wire cable?
The colours will be, black, white and a bare copper ground.
Are electrical wires that come from your house to utility pole which now have some bare spots dangerous?
It depend on the type of drop to your home. There used to be three individual insulation covered wires that used to bring a service voltage into your home. The separation on these conductors was about four inches from each other. If this is the type of service drop that you have bare spots would be of no problem to you. If the service drop is of the new style called triplex where two "hot" conductors are wrapped around a bare aluminium steel cored messenger then this could be a problem as to the closeness of the conductors to each other. If you are concerned about this condition keep in mind that this part of your electrical service is the responsibility of your electrical utility supplier. Your responsibility for your service does not start until after the weather head on your service. Call your utility distributor and have them have a look at it and they will make the decision as to whether to replace it or not.
Can coaxial cable electrocute?
Yes, under certain circumstances the coax can carry sufficient voltage and current to be lethal if you make contact with the center conductor and ground, and the voltage enters your body. This might happen if you chance to contact the main trunk cable either coming from a downed aerial line or from an in-ground pedestal. In practice, the coax in the average home does not carry any appreciable voltage, unless coax-based home phone service is present - and then the ring voltage might be sufficient to shock you if you are in contact with the bare conductors.
Why are polymers used o cover electrails wires?
Most polymers are not very good conductors, so using them to cover the bare wires provides some degree of insulation, making it safer to touch the coated wires than it would be to touch the bare wires. It also helps prevent the wires from "shorting out" to each other or to ground.
Does the Nec allow grounding electrode conductor to be run in conduit that has other conductors in the conduit and what code section?
No, the bare copper grounding conductor can not be in a conduit with other conductors. It can be in conduit by itself to provide mechanical protection for the wire.
How would you spell bear as in bear arm?
If using the word as to carry or bring as in "to bear arms" then it is bear. If using the word as uncoveredas in "his arms were bare" than it is bare.
Can you give sample of sentences using bare?
I'm walking in the sand with my bare feetMy body is bare i have no protection
Can you give sentence using attacked?
The villain attacked him with bare hands.
What are the benefits of using Bare Minerals cosmetics?
The main benefits of using Bare Minerals cosmetics is that they are completely 100% natural. This means your skin will not be subjected to the harsh chemicals that are found in other beauty products.
