Printable Voltage Drop Max Length Table
This one-page Letter landscape sheet is for anyone sizing wire runs from a voltage loss formula. It shows maximum one-way length for a 3% drop on single-phase copper conductors at 75 °C. Columns list current and the wire sizes 120 V 12 AWG, 120 V 10 AWG, 120 V 8 AWG, 240 V 10 AWG, 240 V 8 AWG, and 240 V 6 AWG. Rows include common loads such as 5 A, 10 A, and 15 A with lengths in feet.
Free printable · PDF
- 1 page
- US Letter, landscape — choose “Fit to page” for A4
- PDF, 101 KB
Free for personal, family and classroom use.
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Use the table to estimate the longest run allowed before voltage drop reaches 3% for a given current and conductor size. Match the current row, then read across to the voltage and wire size you plan to use. Check ampacity separately, since this sheet only covers voltage drop length.
Good for
- Quick wire-length check for 120 V branch circuits
- Compare 240 V runs across common copper sizes
- Plan feeder runs before calculating ampacity
Tip: Print landscape and keep it with your wire sizing notes for faster field checks.
4 files · XLSX, PDF, DOCX
Get every sheet: Voltage Drop Toolkit
This sheet plus 3 more in one download, with the editable Excel and Word files. Excel voltage drop calculator for single- and three-phase runs, AWG and mm² resistance tables, maximum-length tables for 120 V and 240 V at 3%, and a wire run planning log.
$3.00 USD, one-time 4 files · about $0.75 each
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