⚡ Engineering Tool

Voltage Drop Calculator

Calculate the percentage and absolute voltage drop across a cable run. Ensure terminal voltage stays within equipment tolerance and IEC 60364 limits to prevent malfunction.

📐 Standard: IEC 60364-5-52 ⚡ Limit: 3% terminal / 5% total (IEC) 🔌 Phase: 1-phase & 3-phase

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Input Parameters

Load Current (I) A

Must be a positive number

System Voltage

Cable Length (L) m

Must be a positive number

Cable Cross-Section mm²

Conductor Material

Power Factor (cos φ)

Allowable Voltage Drop %

IEC 60364: 3% for terminal circuits, 5% total

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Calculation Results

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Enter parameters above and click Calculate

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Size vs. Voltage Drop

Voltage drop for different cable sizes at current conditions. Green = within limit.

Size (mm²)	ΔU (%)	ΔU (V)	Status

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Assumptions & Notes

Input Summary

Current—

Voltage—

Length—

Cable Size—

Power Factor—

Engineering Notes

⚠️ Voltage drop affects motor starting torque, lighting quality, and equipment efficiency. Sensitive loads may require tighter limits (1–2%).

📌 For MV cables, reactive component (X) is more significant. This calculator uses typical X = 0.08 mΩ/m for LV and 0.12 mΩ/m for MV.

Related Calculators

→ Cable Sizing Calculator → Power Loss Calculator