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Why do telephone wires hang loosely in summer time and straight and taut when it is cold?
Wiki User
∙ 12y ago
Telephone and electrical wires "sag" in the summer, in hot weather. This is because the wires, like most materials, expand when they are heated. The additional length means that the wires lose tension and sag or droop. In the winter, the wires become shorter, and they may break if too tightly strung.
Wiki User
∙ 12y ago
Wiki User
∙ 11y agoIn summer, when it is hot, the wires stretch slightly. So that causes them to sag between the poles. In winter,they contract so look tighter. That is because the particles:
Hot: Move faster, they get more energy
Cold: Move less, They get less energy
Wiki User
∙ 12y agoEvery material expands in heat and contracts in cold. The amount of change depends on the material in question. It is important in construction to take this into account.
If the cables where hung too tight in the hot summer, when it got cold in winter they would be unable contract enough and would snap. If they where hung loose in the winter, then in summer the cables would sag far too much. An engineer must take this into account when selecting the material used, and planning how much slack to leave to ensure that they will be reliable in hot and cold conditions.
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When will a telephone wire be longer summer or winter?
When metals (like the copper in the telephone wires) gets exposed to heat, they expand (thermal expansion) and when the get cooled they shrink. This directly implies that cables are longer in summer when it is hot. So telephone wires are longer in the summer.
Why is it important to not overstretch telephone wires when putting them in summer?
When they get colder, they will get shorter - and the tension will increase. That might make them break.
What would happen if the telephone wires were made tight in summer and then they went cold?
so it can survive
Why are telephone wires left slack in the summer?
Bofore the question can be answered, it needs to be properly rephrased.The question contains a grammar error that is all too frequent these days... non-agreement with the subject in number (singular or plural). We need to be more careful of such simple grammar slip-ups. Poor grammar betrays a lack of education and an imprecision of thought.Correction: Why are telephone wires left slack?This error is creeping into speech today...from even the news anchors... through the contraction of "is" following the word "there", e.g. "there's too many jobs being lost...".Correction: There are too many jobs being lost...
Why are wires hung loosely in summer?
beacuse is good
How telephone wires connected?
I'll take that as "How are telephone wires connected?" but it's still unclear what you want to know. Telephone wires are connected just as any other wires are connected. By screw connections, by soldering, by crimping.
what would happen if telephone wires were made tight in summer and then it went cold?
so it can survive
What will happen to the telephone lines if they are fitted tightly from pole to pole?
When a pole shifts with the earth it will pull the wires apart and cause a break somewhere in the line. The poles are meant to suspend the wires in air, not to stretch them... Accurate answer is the lines will break. While breaking is not normally due to poles shifting, that could happen. The reason the wires are slung loosely is because of the expansion and contraction properties of the metal wires. If you look at the lines in the winter, they do not sag much (are tighter) and in the summer the sag is pronounced (looser). If they were strung tightly, they would eventually break during the cold weather.
Why is copper used for telephone wires?
Copper is used for telephone wires because it is the second best conductor of electricity after silver (which is a little pricey).
How many wires does a straight 220V circuit have?
A straight 220V circuit utilizes two wires per circuit.
Why telephone wires need to be slack in the summer?
Telephone and electric wires stretch (expand) when the weather is hotter. Conversely, in the winter they shrink. Without some slack, they could become too tight and break, or pull loose from their anchors.
What do the telephone wire look like on a hot day?
what happens to telephone wires on hot days
