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Calcimator

Fiber Cable Pull Tension Calculator

Calculate maximum pull force for fiber cable installation from cable weight, route bends, friction, and vertical rise.

Inputs

m
kg/km
m
N

Results

Total Pull Tension

2,724.1 N

Safety Factor

0.99×

Max Safe Pull Length

297 m

≈ 12 tennis courts

Straight Pull Force117.7 N
Bend Multiplier23.14×
Vertical Component0 N
Within Limit (1=Yes)0
Sidewall Pressure9,080.4 N/m
How to Use This Calculator
  1. Enter Cable Length (m), Cable Weight (kg/km from manufacturer specs), and Friction Coefficient (0.35 is typical for conduit).
  2. Enter the number of 90° Bends and 45° Bends in the conduit run.
  3. Set Vertical Rise (m) if the cable is being pulled upward through any section.
  4. Enter Cable Max Rated Tension (N) from the manufacturer's data sheet.
  5. Review Total Pull Tension (N), Safety Factor (×), and Max Safe Pull Length — if Safety Factor is below 1, reroute or add pull points.

How the result changes with Friction Coefficient

Friction CoefficientTotal Pull TensionSafety FactorMax Safe Pull Length
0.19147.6 N18.29×5,488 m
0.421,325.4 N2.04×611 m
0.6911,933.5 N0.23×68 m
0.9165,175.8 N0.04×12 m

What each input means

Cable Length
Total cable run length in meters
Cable Weight
Cable weight per kilometer (check manufacturer spec sheet)
Friction Coefficient
Coefficient of friction (PVC conduit ~0.5, lubricated ~0.3, innerduct ~0.2)
90° Bends
Number of 90-degree bends in the cable route
45° Bends
Number of 45-degree bends in the cable route
Vertical Rise
Net vertical rise of the cable run in meters
Cable Max Rated Tension
Maximum pulling tension from cable manufacturer spec (typical: 2700N for standard fiber)

How this is calculated

Formula

T = μ × W × L × g × e^(μ×Σθ) + W × Δh × g

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Cable Length = 300, Cable Weight = 80, Friction Coefficient = 0.5, 90° Bends = 3 = 7 input(s) provided
  2. Calculate Total Pull Tension
    Total Pull Tension
    2724.1 = 2724.1
  3. Calculate Safety Factor
    Safety Factor
    0.99 = 0.99
  4. Calculate Max Safe Pull Length
    Max Safe Pull Length
    297 = 297
  5. Calculate Straight Pull Force
    Straight Pull Force
    117.7 = 117.7
  6. Calculate Bend Multiplier
    Bend Multiplier
    23.14 = 23.14

Engine last updated . Checked against 3 independently-derived tests — how we verify calculators.

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