Cable Size Calc — VoltPro

VoltPro is the electrical calculator built for the French NF C 15-100 standard (2024 edition).

CABLE SIZE CALCULATOR
Pick the circuit (lighting, sockets, cooktop, water heater, EV charging point…), set the cable
run length: VoltPro shows the cable cross-section, the breaker rating and the voltage drop, live.
If the length requires an upsized cross-section, VoltPro explains why.

VOLTAGE DROP
Voltage drop calculation in single-phase 230 V or three-phase 400 V, copper or aluminium,
with a compliance verdict and a suggested fix.

NF C 15-100 GUIDE, ROOM BY ROOM
Kitchen, bathroom (zones), living room, bedrooms: the mandatory circuits, the number of
sockets and the protections required by the NF C 15-100 standard.

ELECTRICAL PANEL AND LABELS (PRO)
Build your panel rows (type A/AC RCD, 20% spare capacity), and print the label strip
sized to the modules (Legrand, Schneider, Hager) as a PDF.

SITE MODE (PRO)
Save your calculations and panels per site, find them again offline.

— 100% offline: no account, no data collection, no ads.
— PRO key as a one-time purchase: no subscription.
VoltPro is a sizing aid tool: it does not replace the study of a qualified professional nor
the checks performed by Consuel.