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What is the reason during the summer when they set up electrical cable they allow the cables to sag?
Wiki User
∙ 12y ago
Due to the thermal expansion of the wiring materials, the wires expand in both width and length. This affects electrical transmission lines, telephone lines, and telegraph lines because of the large space between supporting poles.
Example : Copper (Cu) Thermal Expansion= 17.6 μm/m/oC
Lisa Schaefer
Wiki User
∙ 12y agoDue to the thermal expansion of the wiring materials, the wires expand in both width and length. This affects electrical transmission lines, telephone lines, and telegraph lines because of the large space between supporting poles.
Example : Copper (Cu) Thermal Expansion= 17.6 μm/m/oC
Wiki User
∙ 12y agoWhat are called telephone wires are mostly not telephone but electrical transmission lines. During the summer, the generally warmer temperature heats the wires, and they expand in both width and length. The longer distance between poles means that the linear expansion is more obvious, causing wires and cables to visibly "sag." The (normally black) insulation applied to these wires increases their absorption of solar heat. In some cases, these wires must be tightened in the summer for safety reasons.
In winter, the reverse happens. Cold temperatures cause the cables to shrink. If they are too tight, they could break. So in winter, many wires and lines must have their tensions reduced to offset this seasonal change in length.
Wiki User
∙ 11y agoBecause the cores of overhead wires are made from copper. Metals expand with heat and contract with cold. The higher temperatures in summer make the copper expand - so the lines get slightly longer. In winter, the reverse happens - the lines contract and tighten up.
Wiki User
∙ 12y agoBecause the copper wire at the heart of the wire expands slightly - making the wires longer. since they are fixed at both ends, the wires sag due to the slight increase in length.
Anonymous
Anonymous
Wiki User
∙ 12y agoWires expand with heat and contract with cold. If they set up the wires taught in the summer, they would snap in the winter.
Wiki User
∙ 10y agoWires, like most materials, expand when heated and contract when cooled.
Wiki User
∙ 8y agoBecause the cold causes objects to contract, and heat causes them to expand. Those wires are encased in rubber, which is very reactive to temperature changes.
Anonymous
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When Ontario Hydro workers set up electrical cables during the summer they allow the cables to sag. Suggest a reason for this. In your answer refer to the particle theory?
i know someones going to be on this sooooooooo....... they sag because the hydro workers know, from the heat the cbles will sag during the summer, so they start the sag so they cant sag anymore
Why are wires hung loosely in summer?
beacuse is good
Why cables sag?
Cables are made out of metals which has the property of expanding on heat and contracting on cold due to elasticity hence they sag during summer
Why does the feet sometimes feel cold even during the summer time?
blood circulation issues can be the reason for this.
What was one reason wealthy planters Lives in Charles town to during the summer month?
the weather was warm
Why shouldn't we wear synthetic clothes during summer?
The reason you should avoid synthetic clothing during the summer is they are not breathable, they will make you sweat worse, and they will be uncomfortable. They are not made from natural things like cotton.
Can SAD happen in summer?
As far as I know, seasonal affective disorder only affects people during the winter, not the summer. Summer is not a depressing season. Even if you are depressed in the summer, it is not because of the summer weather, it's for some other reason.
Why does classes ends in the summer time?
The most obvious reason would be that in the past when we were primarily an agrarian society, children were needed to work the fields during the summer.
When was The Last Summer of Reason created?
The Last Summer of Reason was created in 2001.
Why do you have summer Olympics?
We have do have the Summer Olympics because during summer there are certain activities that are best suited to be held then. The other reason is that it gives certain countries especially in Africa and Asia a chance to participate in such games.
Is it wrong for a 23 year old university student to not work during the summer?
If you can afford not to work, then there is no reason for you to work.
What reason is there to take summer school?
Basically, there are two reasons why students would sit in school during the summer. One reason would be to repeat a course he or she failed. It's quicker to do this during the summer months than having to stretch it over a complete term. The other reason is to advance quicker towards graduating by having the credit for completing a course early. This is especially a good idea for those planning to attend college.
