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Repair and Maintenance of Power Distribution Lines
ncert.nic.inconcrete and steel (Fig. 4.2). P.S.C. poles: Pre-stressed cement concrete poles are essentially made of concrete. A frame of high tensile steel wire is inserted into a mould and stretched to a certain level. Galvanised wire is used as earth wire inside the mould. A right proportion of concrete mix is poured in the mould and a vibrator is used