Engineering Tools
Voltage Drop Calculator
Calculate voltage drop for copper and aluminum conductors per IEC 60364-5-52 and industry standards. Input cable parameters to determine voltage drop percentage, load-end voltage, and compliance status.
Cable Parameters
Resistivity: 0.0175 Ω·mm²/m at 20°C (IEC 60228)
IEC 60364-5-52 recommends ≤3% for lighting, ≤5% for motor circuits
Calculation Results
--Voltage Drop
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Volts (V)
Drop Percentage
--
% of supply voltage
Load-End Voltage
--
Volts (V)
Compliance Status
Enter parameters and calculate
Calculation Breakdown
- Resistivity (ρ) at operating temp
- --
- Conductor Resistance (R)
- --
- Phase Factor (k)
- --
- Temperature Correction (α)
- --
- Active Power Loss
- --
- Max Allowable Current
- --
Formula Applied
Single Phase: ΔV = 2 × ρ(T) × L × I × cos(φ) / S
Three Phase: ΔV = √3 × ρ(T) × L × I × cos(φ) / S
Minimum Cable Size for Compliance
Standards Reference
IEC 60364-5-52
Max 3% for lighting circuits, 5% for motor/power circuits from service entrance
BS 7671 (UK)
Max 3% for lighting, 5% for other uses from origin of installation
NEC (US)
Recommended max 3% branch circuits, 5% total (feeder + branch)
GB/T 16895
Chinese national standard aligned with IEC 60364 series requirements
IEC 60228
Conductor resistivity: Cu 0.0175 Ω·mm²/m, Al 0.028 Ω·mm²/m at 20°C
Temperature Coefficient
Cu: α = 0.00393/°C, Al: α = 0.00403/°C (per IEC 60228)
Disclaimer: This calculator provides indicative results based on simplified IEC formulas for resistive voltage drop. Reactive (inductive) component is not included. Results should be verified by a qualified electrical engineer before use in design or procurement decisions. Jinda Cable accepts no liability for decisions made based on this tool alone.