Why are telephone wires are not directly fixed between 2 poles
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If you are asking why are they loose instead of tight?
Over long distances (e.g. a single wire over multiple poles) the wire will be subject to heat and cold which will cause the wire to heat and shrink. You need some margin to allow this to happen otherwise the wire will break from stress.
If there is a break then it is most likely to happen at a join or attachment because of wear. If you have some slack then you can make a splice/joint.
If it is rigid then ice is more likely to form on the wire, more flexibility will shake off any ice build up.
Over long distances (e.g. a single wire over multiple poles) the wire will be subject to heat and cold which will cause the wire to heat and shrink. You need some margin to allow this to happen otherwise the wire will break from stress.
If there is a break then it is most likely to happen at a join or attachment because of wear. If you have some slack then you can make a splice/joint.
If it is rigid then ice is more likely to form on the wire, more flexibility will shake off any ice build up.
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