![]() ![]() These poles have the longer life (more than 40 years) which can further be increased by regular painting. These poles possess greater mechanical strength and thus permit the use of longer spans (60 to 80metres). Tubular poles are of round x-section generally having three diameters for 1/3rd of the length of the pole and rolled steel joists are of āIā cross-section. The rail poles are of the shape of track used for railways. These poles for transmission line are of three types: The choice of line support for a particular case depends upon the line span, x-sectional area, line voltage, cost and local conditions. The following are main types of poles and towers generally used in the overhead system: Easy accessibility of conductors for maintenance.Light in weight so as to ease the transportation.High mechanical strength in order to withstand the weight of conductors and wind loads etc. ![]() They should have following essential properties: Properties of Transmission Line Poles ![]() ![]() These may be various types of poles or towers. The supporting structure for overhead lines is required to keep the bare conductors at a suitable level above the ground. ![]()
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