Wire Pull Tension Calculator
Calculate wire pulling tension and force requirements. Determine safe pulling limits for electrical cables based on cable type, distance, and conduit conditions.
Step 1: Cable Specifications
Basic Tension Formula
Tension (lbs) = Cable Weight × Pull Distance × Friction Coefficient × Number of Cables
÷ 1000 (for lbs/1000ft conversion)
Step 2: Installation Conditions
Friction Coefficients
PVC: 0.3-0.4
EMT: 0.4-0.5
Rigid Steel: 0.5-0.7
Aluminum: 0.4-0.5
Flexible: 0.6-0.8
Wire Pull Tension Results
Total Pulling Tension Required
Cable Type Comparison
| Cable Type | Weight (lbs/1000ft) | Max Pull Tension | Recommended Distance |
|---|
Wire Pull Tension Formula
T = (W × L × μ × N) ÷ 1000
Where:
• T = Tension (lbs)
• W = Cable weight per 1000 feet (lbs/1000ft)
• L = Pull distance (feet)
• μ = Friction coefficient
• N = Number of cables
For bends: Add 10-15% per 90° bend
Safety factor: Multiply by 1.5-2.0
Example Calculation
Example: 3x THHN cables, 100ft pull in PVC
Cable weight: 150 lbs/1000ft
Distance: 100 feet
Friction coefficient: 0.4
Cables: 3
Bends: 1 (add 12%)
Calculation:
(150 × 100 × 0.4 × 3) ÷ 1000 = 18 lbs
Add bend: 18 × 1.12 = 20.16 lbs
Safety factor: 20.16 × 1.5 = 30.24 lbs
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