Section 23 "Clearances" is the most often referenced section of the National Electrical Safety Code (NESC) sections. It covers all clearances, including climbing spaces, involving overhead supply and communication lines. The NESC Clearance App calculated the clearance tables often used by electrical transmission engineers for different voltages of both AC and DC.
The Transmission Line Tool on Mobile (TLTM) Ruling Span Sag Calculator performs quick calculation of mid-span sag as well as three-wave return time with known conductor tension and unit weight.
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