15.5 An overhead transmission line conductor weighs 0.35 kg/m. Ultimate strength is 800 kg and factor of safety is 2.0. Span length is 160 m. One support is at a height 70 m from the ground. Determine the minimum clearance from the ground and the lowest point of the catenary from the supports if the second support is at a height (a) 40 m (b) 65 m from the ground. Ans: (a) 40 m; (b) 64.14 m.
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The maximum tension is given by: \[ T_{max} = \frac{\text{Ultimate strength}}{\text{Factor of safety}} \] \[ T_{max} = \frac{800 \text{ kg}}{2.0} = 400 \text{ kg} \] Show more…
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