Sags & Tensions of Span Attachments

The above discussion on curve creation (Initial, Final with Load, Final with creep) assumes a constant known temperature for the material sample. All materials that are currently used in pole line construction expand with an increase in temperature. Said another way, these materials would have a positive coefficient of thermal expansion. This means that the physical length of wires and cables will increase on hot days or under heavy electrical loads. This is fairly intuitive to most that power wires/cables would sag more on hot days than in the winter. Therefore it is important to consider what temperature to use for the sag and tension result you are seeking.