Free Cable Sizing Calculator
Estimate the minimum cable cross-sectional area based on current capacity requirements.
Minimum Conductor Area
10.0 mm^2
Minimum Conductor Area vs Design Current (I)
Cable Sizing by Current Density
The cable must carry the required current without exceeding safe temperature limits.
Simplified Method
A = I / J
where A is the conductor cross-sectional area, I is the design current, and J is the allowable current density. Typical values: enclosed cables 3-4 A/mm^2, open-air cables 5-6 A/mm^2. Always verify against manufacturer ampacity tables and installation derating factors.
Example Calculation
40 A load with 4 A/mm^2 allowable current density.
- 01A = 40 / 4 = 10 mm^2
- 02Select the next standard size: 10 mm^2 or 16 mm^2 depending on available sizes.
- 03Also verify voltage drop is within limits for the cable run length.
Frequently Asked Questions
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