To calculate the recommended pulling tension, the following formula includes the "rolling efficiency" of the stringing sheaves:
The maximum pulling tension applied to the conductor should not exceed ten percent (10%) of the rated strength of the conductor, as recommended by IEEE Standard 524. For example, Drake ACSR has a rated strength of 31,500 lb. (140 kN), therefore the pulling tension should not exceed 3,150 lb. (14 kN) during the installation of the conductor. The formula above assumes a level pull. Pulls which include angles, elevation changes, tighter sag values and having to clear high obstacles will increase the pulling force required.
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