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Introduction to Overhead Clearance Relationships and Sag Considerations

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After completing this course, you will be able to: Describe the normally expected levels of different classes of lines and equipment on overhead lines Identify conflicting situations Describe the philosophy for joint-use consideration on overhead lines. Describe the requirements for installing communication lines and equipment in the overhead supply spaces Describe the requirements for installing supply lines and equipment in the overhead communication space Determine the correct NESC Rule for clearances of interest. Describe key terms. Describe the basic clearance requirements of the NESC for different situations. Calculate ruling spans Understand the effect of uneven spans on conductor tension, pole bending and clearances in each span. Understand the need to provide additional clearances at installation to allow for sag changes over time. Understand the factors affecting conductor temperature. Understand the appropriateness of alternate methods of determining actual conductor temperature in the field. Understand the understand the shape of the catenary sag curve Determine the amount of sag that exists at any point in a span

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