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In the summer the power lines hang down between the posts then why dont the engineers tighten them up?
Wiki User
∙ 12y ago
When objects are cooled down, they contract. Engineers who put up telephone wires in the summer leave the wires hanging slack so that in winter, the wires have a chance to contract without pulling the poles and damaging property or infrastructure.
Wiki User
∙ 14y ago
Wiki User
∙ 12y agoMatter generally expands with heat. The heat of the summer expands the lines and the hang down. In the winter matter shrinks. If the engineers tighten the lines in the summer they would probably snap in the winter. Engineering is about building to environmental conditions. Equipment usually has an Operating Temperature Range. Therefore engineers use enough length to accommodate cold winters and hot summers without having to redo the lines.
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Why do engineers put power lines so that they are slack in hot weather?
in the winter season materials such as rubber insulators and copper wire shrink and in the summer they expand just like wood. Therefore slack is needed on powerlines in relation to the weather so there is a little give to them. Engineers have nothing to do with the slack in the lines, it occurs naturally. In the sunlight objects expand a little due to the heat. This goes for roads, bridges, sidewalks, shingled roofs and hanging power lines. They sag more in the summer than in the winter. Engineers actually have to find ways so that they wont get slack. This expansion and contraction of any given material will actually shorten the life of it over time, and it will have to be replaced more often.
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Why is it advisable to allow telephone lines to sag when stringing them between poles during the summer?
Because they will contract in the winter. If you strung them tightly during summer, when the cold weather arrived, the lines would shrink, and maybe snap.
Why do engineers put power lines so that they are slack in hot weather?
in the winter season materials such as rubber insulators and copper wire shrink and in the summer they expand just like wood. Therefore slack is needed on powerlines in relation to the weather so there is a little give to them. Engineers have nothing to do with the slack in the lines, it occurs naturally. In the sunlight objects expand a little due to the heat. This goes for roads, bridges, sidewalks, shingled roofs and hanging power lines. They sag more in the summer than in the winter. Engineers actually have to find ways so that they wont get slack. This expansion and contraction of any given material will actually shorten the life of it over time, and it will have to be replaced more often.
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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.'
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