Cable Size & Voltage Drop IEC

Cable Calc is the cable sizing calculator for electricians who work to IEC 60364 – in Europe, the Middle East, Africa, India and everywhere metric cables are used.

Enter the load, the length and how the cable is installed. Cable Calc picks the breaker, applies the derating factors and checks the voltage drop, then shows the cross-section you need in mm².

CABLE SIZE (FREE)
• Current-carrying capacity to IEC 60364-5-52 Annex B, copper, 1.5 to 120 mm²
• PVC (70 °C) and XLPE/EPR (90 °C) insulation
• Installation methods A1, A2, B1, B2, C and E
• Ambient temperature and grouping correction factors
• Breaker rating chosen so that Ib ≤ In ≤ Iz
• Load as current (A) or power (kW), single-phase, three-phase or DC

VOLTAGE DROP (FREE)
• IEC 60364-5-52 Annex G method, including reactance and power factor
• Drop in % and volts, voltage at the load, pass/fail against your limit
• Minimum size to meet the limit

OHM'S LAW & POWER (FREE)
• Enter any two of U, I, R and P to get the other two
• Power to current for 1-phase, 3-phase and DC

PRO TOOLS
• Earth-fault disconnection check for TN systems: maximum cable length for B, C and D curve breakers, fault current with a known Ze
• Motor circuits: full-load current, starting current and starting voltage drop for direct-on-line, star-delta, soft starter and drives
• Projects: save calculations per job or customer
• PDF calculation reports to send to clients
• No ads

WHY ELECTRICIANS USE IT
• Works offline on site
• Clear results with every intermediate value shown, so you can check the working
• Remembers your last inputs
• Available in English, German, French, Spanish, Italian, Polish, Portuguese, Turkish and Dutch

Pro is available as a yearly subscription or a one-time lifetime purchase.

Important: Cable Calc gives guidance based on IEC 60364. Always verify results against the standard, the cable manufacturer's data and your national wiring regulations. The installer remains responsible for the design.