Cable Duct Size Calculator
Accurate cable duct sizing for electrical installations
Cable Duct Size Calculator
Compliant with NEC and IEC Standards
Results:
Total Cable Area: 0.00 mm²
Required Duct Area: 0.00 mm²
Recommended Duct Size: 0.00 mm
How to Use the Calculator
Power Cables
- Select "Power Cable" type
- Enter cable outer diameter
- Specify number of cables
- Choose appropriate fill factor
- Select duct shape preference
Control Cables
- Select "Control Cable" type
- Enter cable diameter including jacket
- Input total cable count
- Use standard 40% fill factor
- Choose optimal duct configuration
Data Cables
- Select "Data Cable" type
- Measure cable outer diameter
- Count all cable runs
- Consider future expansion needs
- Select appropriate duct shape
Cable Duct Sizing Fundamentals
Fill Factor
Fill factor determines cable density:
- 40% - Standard installations
- 50% - High density applications
- 60% - Maximum allowable fill
Duct Shapes
- Round - Most efficient space usage
- Square - Easy installation
- Rectangular - Multiple cable layers
Key Formulas:
Cable Area = π × (D/2)² × N
Duct Area = Cable Area / Fill Factor
Round Duct: D = √(4 × Area / π)
Calculation Formulas
Total Cable Area:
A_cable = π × (D/2)² × N
Required Duct Area:
A_duct = A_cable / (Fill Factor / 100)
Round Duct Diameter:
D_duct = √(4 × A_duct / π)
Example Calculation
Power Cable Installation:
Cable Diameter: 25mm
Number of Cables: 4
Fill Factor: 40%
Cable Area = π × (25/2)² × 4 = 1963.5 mm²
Duct Area = 1963.5 / 0.4 = 4908.7 mm²
Round Duct Diameter = √(4 × 4908.7 / π) = 79.0 mm
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