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The less sag you want, the more force would be required to pull the wire.
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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.
Why do wires sag in summers'?
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Why do metallic wires sag in summer?
They expand with heat.
How do you know when to bend the glass tube?
When the heated glass first begins to sag.
Why does the electric wire become loose in summers?
The metal wires expand in the heat - making them sag.
Why do power lines sag lower between telephone poles in summer than winter?
the metal inside the wire heats up leading to the expansion of the wire.
What is sag in transmission lines?
Catenary
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.
What happenes to telephone wires when they expand with heat?
became sag loosen
Why is a sag provided in the transmission line?
Sag is provided in transmission lines in order to lessen the tension of the transmission lines. Sag literally means to be bend in shape. In overhead transmission lines , the difference in level between points of supports (towers or utility poles) and the lowest point on the conductor is called a sag. Explanation: While erecting an overhead line, it is very important that the conductors are under safe tension. If the conductors are too much stressed between the supports ( towers, utility poles), then the stress on the conductors may reach to an unsafe level and the conductor may break due to excessive pressure ( i,e tension). in order to permit safe tension in the conductors, the conductors ( i.e the transmission lines) are not fully stretched but are allowed to have a dip or a sag.
What is sag template?
A Sag Template is a very important tool with the help of which the position of towers on the Profile is decided so that they conform to the limitations of vertical and wind loads on any particular tower, and minimum clearances, required to be maintained between the line conductor to ground, telephone lines, buildings, streets, navigable canals,power lines, or any other object coming under or near the line.
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.
What is the height of the center of a tennis court net?
Because the line holding up the net forms a curve. The Earth's gravity pulls it down in the middle. It is held up at both sides. Check out washing lines, electric power lines, telephone lines: they all sag in the middle.
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 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 telephone lines sag instead of being straight across?
Everything has a weight/mass. The larger the distance between the poles, the more wire is used, which means more weight. Gravity pulls down on the wire causeing it to sag where not supported. If construstion workers were to make the wire as tight as possible it may pull the poles right out of the ground. This also provides flexibility in times of high winds or when the poles shift. In addition, a sag is intentionally provided to provide slack for when the line contracts in cold weather.
What is to hang or sink downward?
sag
