A transmission tower, also known as an electricity pylon, is a tall structure that supports an overhead power line. The more cost application is high-voltage transmission lines that transfer bulk electric power from producing units to electrical substations. These towers come in a wide variety of shapes and sizes. Typical height ranges from 15 to 55 m (49 to 180 ft). In addition to steel, other materials such as concrete and wood may be employed.http://www.leadertruss.com/alu....minum-truss/aluminum
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