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They expand with heat.
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Why do wires sag in summers'?
idfjjefo
Why does the electric wire become loose in summers?
The metal wires expand in the heat - making them sag.
Why is a power line more likely to break in winter than in Summer even if it is loaded with the same weight?
Heat in the summer makes materials expand which make power lines somewhat elastic. During the cold months of winter the power lines contract. The difference of the reaction of the materials during seasons is why a power line is more likely to break in the winter than in the summer bearing the same weight.
What are the physical features of silver?
It is white metal with metallic lusture. It is ductile & can be drawn into wires. It reacts with acids to form silver salt of that acid.
Telephone lines are allowed to sag when they are hung Why?
The less sag you want, the more force would be required to pull the wire.
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 do wires sag in summers'?
idfjjefo
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 advisable to allow telephone wires to sag between poles?
because telephone wires might contract and may eventually snap during cold days. hence, it is advisable to allow them to sag during summer days to allow contraction for cold days. -Hadisa Nuddin
Why do overhead wires hang with a slight sag in summer time and hang tightly in winter?
Overhead wires expand slightly in the summer when the temperature is higher, so they become a little longer and hang lower. Clearance height rules must be met at the maximum expected temperature.
Why metal wires sag in summers?
They expand with heat.
Why do telephone wires hang loosely in summer time and straight and taut when it is cold?
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.
Why do wires hang loose on poles in summer?
Every 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.
What happenes to telephone wires when they expand with heat?
became sag loosen
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 electric transmission lines between two poles are found to sag in summer?
The metal conductor in the line contracts in the cold of winter making the line more taunt, and expands making the line longer in the summer's heat. Thus the summer 'sag.'
Why do telephone wires become loose and sag in winter?
They shouldn't, usually it is the other way around. As with all wire, the temperature effects wire lengths. When wires become warm as in a hot summer day the wires expand and droop and likewise when they become cold as in winter they contract and tighten up. The wires have to be installed to take this condition into consideration. There is a specific engineered sag allowed for each type of conductor from pole fix point to pole fix point.
