Calculate voltage drop for single-phase and three-phase circuits. NEC (Art. 210/215) and IEC (60364-5-52) methods. Copper and aluminium conductors.
// INPUTS
// Results update automatically as you type
// CIRCUIT PARAMETERS
Calculated from rating — used for VD
// CABLE PARAMETERS
ft (NEC)
Voltage Drop—V
Voltage Drop (%)—%
Receiving End Voltage—V
NEC Limit (branch/feeder)3% / 5%
Status—
Max Length @ 3% VD—ft
Max Length @ 5% VD—ft
Disclaimer: For reference and preliminary estimation only. Verify results against the applicable code, project specification, and equipment data before use in design documents.
Please check inputs — all values must be positive.
// RELATED TOOL
CableSched-LMX
Full cable schedule generator — automates ampacity checks, voltage drop across all circuits, and routing references at project scale.