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in Physics by (56.9k points)

A transmission line has a span of 150 metres between supports, the supports being at the same level. The conductor has a cross-sectional area of 2 cm2 . The ultimate strength is 5,000 kg/cm2 . The specific gravity of the material is 8.9. If the wind pressure is 1.5 kg/m length of the conductor, calculate the sag at the centre of the conductor if factor of safety is 5.

by (10 points)
Please what if safety factor is not giving

1 Answer

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Best answer

∴ working stress = 5,000/5 = 103 kg/cm2 ; Working tension, T = 102 × 2 = 2,000 kg wt.

Vol. of one metre length of conductor = 2 × 100 = 200 cm3

Wt. of 1 m of material = 8.9 × 200 g or W = 8.9 × 200/1,000 = 1.98 kg-wt.

Total Wt. per metre

Now d = Wl2 /2T = 2.48 × (150/2)2 /2 × 2,000 = 3.5 metre

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