Voltage Drop Calculator

Circuit Parameters

System Voltage

Phase

Wire Material

Wire Size

One-Way Distance (feet)

Load (amps)

NEC Reference

NEC 210.19(A) Informational Note No. 4 and 215.2(A) Informational Note No. 2 recommend a maximum voltage drop of 3% for branch circuits and 5% total for feeder + branch circuits combined.

≤ 3% — Compliant

3–5% — Caution

> 5% — Exceeds limit