Enter the conductor span (mm) and sag (mm) into the Calculator. The calculator will evaluate the Conductor Length. 

Conductor Length Formula

CL = Sp + ((8*Sa^2)/(3*Sp))


  • CL is the Conductor Length (mm)
  • Sp is the conductor span (mm)
  • Sa is the conductor sag (mm)

How to Calculate Conductor Length?

The following steps outline how to calculate the Conductor Length.

  1. First, determine the conductor span (mm). 
  2. Next, determine the conductor sag (mm). 
  3. Next, gather the formula from above = CL = Sp + ((8*Sa^2)/(3*Sp)).
  4. Finally, calculate the Conductor Length.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem : 

Use the following variables as an example problem to test your knowledge.

conductor span (mm) = 30

conductor sag (mm) = 4.5