EXAMPLE RUN3.95% drop16 A · 75 ft · 120 V · 12 AWG copper
APP SCREEN / EXAMPLE
WHY IT’S USEFUL
Long runs can meet basic ampacity requirements and still deliver poor voltage at the load. Craftmetry makes distance part of the decision and shows when voltage drop—not ampacity—is driving an upsize.
WHAT IT DOES
Useful detail without the spreadsheet.
01
Voltage-drop mode
Enter material, conductor size, phase, voltage, current, and one-way distance to see drop in volts and percent.
02
Wire-size mode
Find the minimum conductor that clears both NEC table ampacity and a 2%, 3%, or 5% drop limit.
03
Real installation inputs
Choose copper or aluminum, single- or three-phase power, system voltage, and insulation temperature column.
USE IT WHEN
The answer needs to travel with the work.
✓Detached buildings, pumps, gates, and other long branch circuits
✓Comparing conductor options before buying wire
✓Explaining why a run needs to be upsized beyond its basic ampacity
