Electrical power/ CALCULATOR

Single-phase copper voltage-drop screen

Estimate the resistive part of voltage drop and cable heat for a two-conductor single-phase run.

One-way cable lengthmMeasure the actual route from supply to load; the return conductor is included by the formula.

Steady design currentAUse the applicable steady current after deciding which loads can run together.

Copper conductor areamm²Use the actual conductor cross-sectional area, not cable outside diameter.

Supply voltageVNominal voltage used for the percentage comparison.

Estimated resistive voltage drop

5.29 V

Estimated voltage drop

2.30 %

Screened voltage at the load

224.71 V

Estimated cable heat loss

66.7 W

Two equal copper conductors at reference resistivity 0.0175 Ω·mm²/m and steady current. Reactance, power-factor angle, harmonics, conductor temperature, terminals, protective devices, parallel paths and supply impedance are excluded. This is a resistive voltage-drop screen only; ampacity and protection require a separate design.

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Electrical power

Single-phase AC load current

Convert real input power, voltage and power factor into apparent power and approximate steady current.