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Cable Sizing Calculator NF C 15-100
FreeCalculate cable cross-section and breaker rating based on power, length and allowable voltage drop.
Compliant with NF C 15-100
🔧Sizing
🔌Cable section
2,5mm²
⚡Breaker rating
16A
🔋Operating current Ib
15,3A
Actual voltage drop
Max allowable : 3%
2,4%
Iz admissible (selected section)
21A
Governing constraint
voltage drop
📐 NF C 15-100 Formulas
Ib = P / (U × cos φ) = 3000 / (230 × 0.85) = 15.3 A
ΔU% = (2 × ρ × L × Ib × 100) / (S × U)
Conditions : In ≥ Ib et In ≤ Izρ copper at 70°C = 0.0225 Ω·mm²/m. The selected section is the maximum between the section by current-carrying capacity and the one by voltage drop.
Standards & regulations
- NF C 15-100Low-voltage electrical installations — Rules
- NF C 32-201Power cables — Current-carrying capacity calculation
- UTE C 15-105Practical guide — Conductor section determination
This tool provides indicative estimates. Results do not substitute professional advice. Always verify with current regulations.
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