Calculadora de Dimensionamiento de Cables KEC
Ingresa corriente y condiciones de instalación para encontrar el tamaño de cable según KEC. Incluye factores de corrección por temperatura y agrupamiento y análisis de caída de voltaje.
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What is a KEC Cable Sizing Calculator?
A KEC Cable Sizing Calculator determines the correct conductor size in mm² according to the Korean Electrical Code (KEC), which is based on IEC 60364-5-52. It uses standard ampacity tables for PVC (70°C) and XLPE (90°C) insulated cables, applies temperature correction and grouping reduction factors, then verifies voltage drop compliance with KEC limits: 2% for branch circuits, 3% for feeders, and 5% total.
How to Use This Calculator
- Enter the load current (A) and select single-phase (220V) or three-phase (380V)
- Choose conductor material (copper/aluminum), insulation (PVC/XLPE), and installation method (A1-D2)
- Set the ambient temperature, number of circuits, and cable length in meters
- View the recommended cable size in mm², derated ampacity, and voltage drop percentage
- Check the KEC compliance indicators for branch (2%), feeder (3%), and total (5%) limits
Frequently Asked Questions
How do I select the right cable size per KEC?
Determine the load current, then find the smallest cable whose derated ampacity (base ampacity × temperature factor × grouping factor) exceeds the load current. Then verify the voltage drop does not exceed KEC limits: 2% for branch circuits, 3% for feeders, and 5% total. If voltage drop is too high, increase the cable size.
What is the difference between PVC and XLPE insulation?
PVC (Polyvinyl Chloride) is rated for 70°C continuous operation and is cheaper. XLPE (Cross-Linked Polyethylene) is rated for 90°C, offering 15-30% higher ampacity for the same cable size. XLPE also has better dielectric properties and moisture resistance, making it preferred for industrial and underground installations.
Why does ampacity vary by installation method?
Different installation methods provide different levels of heat dissipation. Method C (surface on wall) allows good air circulation and has the highest ampacity. Methods A1/A2 (inside insulated walls) trap heat and have the lowest. Underground methods (D1/D2) have moderate values because soil provides some cooling but also insulation.
What are temperature correction and grouping reduction factors?
Temperature correction adjusts ampacity for ambient temperatures different from the 30°C base (20°C for underground). Higher temperatures reduce ampacity. Grouping reduction applies when multiple circuits are installed together — each circuit heats its neighbors, reducing the allowable current. For example, 3 bunched circuits use a 0.70 factor.
What are KEC voltage drop limits?
KEC specifies three voltage drop limits: 2% maximum for branch circuits (from sub-panel to outlet), 3% maximum for feeders (from main panel to sub-panel), and 5% maximum total from service entrance to the farthest outlet. These ensure adequate voltage reaches equipment for proper operation.
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