An overhead line support at equal level supports has a conductor of cross$-$section $2\mathrm{.}52$ hard

drawn copper and a span length of $150$ metres. Take the specific gravity of copper as $8\mathrm{.}9$

$3.$ Determine the sag which must be allowed if the tension is not to exceed one$-$fifth of

the ultimate strength of $4175/2($a$)$ in still air, and $($b$)$ with a wind pressure of $1\mathrm{.}3$ kg$/$metre

and an ice coating of $1\mathrm{.}25$ cms$.$ Determine also the vertical sag in the latter case