Transmission Line Sag Calculator (Unequal Supports)
Calculate the effective sag of a transmission line when supports are at different heights.
For a level line, the sag is approximated by:
\[
S_0 \approx \sqrt{\frac{L(L_c - L)}{8}}
\]
For supports at different elevations, the effective sag (relative to the lower support) is approximated by:
\[
S_{eff} = \max\left(0, S_0 - \frac{|H_2 - H_1|}{2}\right)
\]
* Enter the support elevations (m), horizontal span (m), and cable length (m).
Step 1: Enter Parameters
Example: 10 m
Example: 12 m
Example: 200 m
Example: 210 m (must be greater than span)