PangPang Tools24 V DC, 10 A, 100 m one-way copper, 10 mm² at 20°C
Approximately 3.45 V drop or 14.37%The DC formula counts the outgoing and return cable paths (2 × I × L × R).
Construction & Electrical
Cable voltage drop estimator
About this tool
Estimate voltage loss on copper or aluminum cable routes for DC, single-phase AC or balanced three-phase AC loads. Enter your actual one-way distance, conductor size, current, power factor and conditions. Results show estimated volts, percentage and comparison to a limit entered by you.
Cable selection & checks
Choose a task. Inputs stay in this page only.
Size and ampacity use the selected country. Voltage drop and DC loss use approximate formulas in mm²; AWG, ambient and conductor temperatures are not copied as equivalent values.
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Worked examples
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Result
Worked examples
Korea · 10 kW electrical input, 380 V three-phase, PF 0.9, copper XLPE B2, 30°C, 1 circuit, automatic breaker
Breaker candidate 20 A; cable 2.5 mm²; allowable ampacity 26 ALoad current is about 16.88 A. Select the supported 20 A rating, then the smallest cable rated at least 20 A under these conditions. Special loads need separate protection selection.
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Result
Worked examples
South Korea · 6 mm² Cu XLPE; 3 loaded; B2; 40°C; 2 bunched circuits
44 × 0.91 × 0.80 = 32.032 AThe 30°C single-circuit reference is reduced for warmer air and grouped circuits.
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Result
Worked examples
One-way length (m) 50 · Conductor area (mm²) 6 · Resistivity (Ω·mm²/m) 0.01724 · DC current (A) 20
First calculated quantity: 0.287333 ΩEstimate round-trip conductor resistance and resistive watt loss on a DC circuit. Enter actual resistivity for the conductor material and temperature; connections are excluded.