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SURVEY OF OVERHEAD HIGH VOLTAGE LINES
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aerial earth wire arcing horns arrangement axis basic span bolts calculated centre circuits clamps clearances cleats concrete poles conductor per ft copper conductors corrosion creosote cross-arm Depth of Planting diam diameter distance drilled ductor dumpy level erection excavation factor of safety fitted fixed formula foundation frustum galvanised ground level guy ropes high voltage hole horizontal ice-loaded conductor instrument intermediate joints lattice tower line conductor method minimum modulus Modulus of elasticity overhead line pin insulators pin type insulators pole types position power line practice pull rawlplug red fir sag-tension screws shown in Fig span length spindle spirit level stay baulk stay rod stay wire steelwork stranded copper stress strut suitable Table tacheometer tee-off template Terminal tests theodolite tower uplift vertical vibration voltage lines wayleave Wind load wind pressure windage wood poles