Disclaimer: RacewayIQ is an informational engineering tool only. All calculations must be independently verified by the user. Do not rely on these results as the sole basis for design, procurement, installation, construction, permitting, or code compliance decisions.

Cable Pull Tension Calculator

Estimate straight-section pulling tension, capstan amplification through bends, and bend sidewall pressure using project-specific manufacturer limits.

Project Information

Project nameLocationPrepared byDate

Cable and Manufacturer Limits

Initial tension (lb)Starting tension at the feed point, reel, or pulling setup before the first segment.Cable weight modeTotal cable bundle weight (lb/ft)Use the total weight of all conductors/cables being pulled together. If entering weight per cable, multiply by cable quantity first.Coefficient of frictionUse lubricant, raceway material, cable-jacket, installation condition, and manufacturer guidance when available.Manufacturer maximum pulling tension (lb)Use manufacturer-published limits for the cable or cable assembly. If unknown, leave blank and treat results as review-only.Manufacturer maximum sidewall pressure (lb/ft)Use manufacturer-published limits for the cable or cable assembly. If unknown, leave blank and treat results as review-only.Manufacturer data source / notesExample: cable datasheet, manufacturer pulling guide, project specification, or manual assumption.

Pull Path Segments

Segments are calculated in the order shown. Tension builds from the first segment to the last segment.

Pull directionPulling from the opposite direction may produce different tension results. Review both directions when field conditions allow.

Pull Path Sequence

Feed / Reel

Initial: 10 lb

Straight Segment 1

Straight

Input: 10 lb

Output: 70 lb

Bend Segment 2

Bend

Input: 70 lb

Output: 112.1 lb

Sidewall: 56.1 lb/ft

Pull Point

Final: 112.1 lb

Segment nameName each segment in pull order.Segment typeUse straight for length; use bend for elbows, sweeps, or direction changes.

Length (ft)Enter actual routed straight length for this portion of the pull.

Segment nameName each segment in pull order.Segment typeUse straight for length; use bend for elbows, sweeps, or direction changes.

Bend angle (degrees)Enter the bend angle for this segment, such as 45, 90, or total combined sweep angle.Bend radius (in.)Use centerline bend radius for sidewall pressure.

Result

Pass

Pass - Based on Entered Limits

Calculated tension and sidewall pressure are below the entered manufacturer limits. Field conditions and manufacturer data still require review.

Final tension

112.1 lb

Maximum calculated tension

112.1 lb

Maximum sidewall pressure

56.1 lb/ft

Tension utilization

11.2%

Sidewall pressure utilization

11.2%

Number of segments

Governing segment

Bend Segment 2

Governing bend

Bend Segment 2

This simplified model does not account for all field conditions. Verify final pulling tension, sidewall pressure, bend radius, lubricant, cable configuration, and pulling equipment with manufacturer guidance.

Coefficient of friction depends on cable jacket, raceway material, lubricant, installation conditions, and manufacturer guidance.

Consider checking the pull from the opposite direction if field conditions allow.

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Calculation Breakdown

Input Assumptions

Initial tension: 10 lb
Total cable bundle weight: 2 lb/ft
Coefficient of friction: 0.30
Manufacturer maximum pulling tension: 1,000 lb
Manufacturer maximum sidewall pressure: 500 lb/ft
Manufacturer data source / notes: Not entered

Segment 1 - Straight

Input tension: 10 lb
Friction contribution: 60 lb
Output tension: 70 lb

Segment 2 - Bend

Input tension: 70 lb
Bend angle: 90 degrees = 1.5708 radians
Capstan multiplier: 1.602
Output tension: 112.1 lb
Sidewall pressure: 56.1 lb/ft

Final Summary

Final tension: 112.1 lb
Maximum calculated tension: 112.1 lb
Maximum sidewall pressure: 56.1 lb/ft
Tension utilization: 11.2%
Sidewall pressure utilization: 11.2%
Governing segment: Bend Segment 2
Governing bend: Bend Segment 2

Code and Design References

Cable manufacturer pulling limits

Maximum pulling tension, sidewall pressure, coefficient of friction, cable weight, and minimum bend radius must come from the applicable cable and lubricant manufacturer data.

Attach project-specific manufacturer data before design release.

Simplified pull model

Straight segments add friction force. Bend segments use capstan amplification. Elevation changes, feed equipment, cable stiffness, lubrication, and field routing require separate review.