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

Left Support Elevation, \( H_1 \) (m):

Example: 10 m

Right Support Elevation, \( H_2 \) (m):

Example: 12 m

Horizontal Span, \( L \) (m):

Example: 200 m

Cable Length, \( L_c \) (m):

Example: 210 m (must be greater than span)

Step 1: Enter Parameters

Calculated Effective Sag