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ELECTRICAL DESIGN 10
18 other sections not shown
aerial cables Alcan alternating current aluminium aluminium conductors anchor angle arcing horns base bolts Britain British calculated capacitance catenary CEGB cent chapter circuit clearance compression concrete conductor material construction copper conductors corona corrosion cost Courtesy crossarm curve diameter distance distribution ductor earth wire effect electrical erection factor of safety fault flashover foundation frequency galvanised given Grid ground high-voltage horizontal Imatran Voima increase insulator string joints lb/sq ft line conductor material maximum metal method normally operation overhead lines phase pin insulator power factor power line power system practice resistance ruling span s.c.a. conductors sag and tension sag template shown in Fig single-phase soil span length steel strands strength stress structure sub-station supports surge suspension insulators Table temperature three-phase tower transmission line transverse vertical vibration voltage wayleave weight West Thurrock wind loading wind pressure wood poles