Is this valid for AC?

It is a resistive (DC-equivalent) magnitude model. Real AC feeders need impedance (R + jX) and power factor context for accurate drop.

Does it replace code ampacity tables?

No. It does not size conductors or apply NEC/IEC rules.

Voltage Drop Calculator

Estimates the magnitude of voltage loss along a resistive path using Ohm’s law. You can enter a total loop resistance directly, or build it from conductor length, cross-section, copper/aluminum resistivity with a linear temperature correction, and the number of identical series segments (for example two for a go-and-return run).

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如何使用

1Choose whether you know total loop resistance or want to compute it from geometry.
2Enter load current in amperes.
3Either enter resistance in ohms, or enter one-way length, cross-section in mm², material, temperature, and how many identical conductors are in series.
4Read voltage drop in volts.

常见问题

Is this valid for AC?: It is a resistive (DC-equivalent) magnitude model. Real AC feeders need impedance (R + jX) and power factor context for accurate drop.
Does it replace code ampacity tables?: No. It does not size conductors or apply NEC/IEC rules.