Marine Wire Gauge at Every Current and Run Length

The smallest conductor that holds the ABYC three percent voltage drop limit, at 12, 24 and 36 volts, with the drop every candidate gauge would produce.

Every page below is computed rather than written, from the same formulas the matching calculator uses, so a figure on a chart page and the same figure in the calculator cannot disagree. Each one carries its working, the basis of every number it prints, and gear chosen by those numbers rather than from a general list.

• What wire gauge does 20 amps need over a 5 foot run? The smallest marine cable that holds the ABYC three percent voltage drop limit for 20 amps over a 5 foot run at 12, 24 and 36 volts, with the drop each gauge would actually produce.
• What wire gauge does 20 amps need over a 10 foot run? The smallest marine cable that holds the ABYC three percent voltage drop limit for 20 amps over a 10 foot run at 12, 24 and 36 volts, with the drop each gauge would actually produce.
• What wire gauge does 20 amps need over a 15 foot run? The smallest marine cable that holds the ABYC three percent voltage drop limit for 20 amps over a 15 foot run at 12, 24 and 36 volts, with the drop each gauge would actually produce.
• What wire gauge does 20 amps need over a 20 foot run? The smallest marine cable that holds the ABYC three percent voltage drop limit for 20 amps over a 20 foot run at 12, 24 and 36 volts, with the drop each gauge would actually produce.
• What wire gauge does 20 amps need over a 25 foot run? The smallest marine cable that holds the ABYC three percent voltage drop limit for 20 amps over a 25 foot run at 12, 24 and 36 volts, with the drop each gauge would actually produce.
• What wire gauge does 20 amps need over a 30 foot run? The smallest marine cable that holds the ABYC three percent voltage drop limit for 20 amps over a 30 foot run at 12, 24 and 36 volts, with the drop each gauge would actually produce.
• What wire gauge does 30 amps need over a 5 foot run? The smallest marine cable that holds the ABYC three percent voltage drop limit for 30 amps over a 5 foot run at 12, 24 and 36 volts, with the drop each gauge would actually produce.
• What wire gauge does 30 amps need over a 10 foot run? The smallest marine cable that holds the ABYC three percent voltage drop limit for 30 amps over a 10 foot run at 12, 24 and 36 volts, with the drop each gauge would actually produce.
• What wire gauge does 30 amps need over a 15 foot run? The smallest marine cable that holds the ABYC three percent voltage drop limit for 30 amps over a 15 foot run at 12, 24 and 36 volts, with the drop each gauge would actually produce.
• What wire gauge does 30 amps need over a 20 foot run? The smallest marine cable that holds the ABYC three percent voltage drop limit for 30 amps over a 20 foot run at 12, 24 and 36 volts, with the drop each gauge would actually produce.
• What wire gauge does 30 amps need over a 25 foot run? The smallest marine cable that holds the ABYC three percent voltage drop limit for 30 amps over a 25 foot run at 12, 24 and 36 volts, with the drop each gauge would actually produce.
• What wire gauge does 30 amps need over a 30 foot run? The smallest marine cable that holds the ABYC three percent voltage drop limit for 30 amps over a 30 foot run at 12, 24 and 36 volts, with the drop each gauge would actually produce.
• What wire gauge does 40 amps need over a 5 foot run? The smallest marine cable that holds the ABYC three percent voltage drop limit for 40 amps over a 5 foot run at 12, 24 and 36 volts, with the drop each gauge would actually produce.
• What wire gauge does 40 amps need over a 10 foot run? The smallest marine cable that holds the ABYC three percent voltage drop limit for 40 amps over a 10 foot run at 12, 24 and 36 volts, with the drop each gauge would actually produce.
• What wire gauge does 40 amps need over a 15 foot run? The smallest marine cable that holds the ABYC three percent voltage drop limit for 40 amps over a 15 foot run at 12, 24 and 36 volts, with the drop each gauge would actually produce.
• What wire gauge does 40 amps need over a 20 foot run? The smallest marine cable that holds the ABYC three percent voltage drop limit for 40 amps over a 20 foot run at 12, 24 and 36 volts, with the drop each gauge would actually produce.
• What wire gauge does 40 amps need over a 25 foot run? The smallest marine cable that holds the ABYC three percent voltage drop limit for 40 amps over a 25 foot run at 12, 24 and 36 volts, with the drop each gauge would actually produce.
• What wire gauge does 40 amps need over a 30 foot run? The smallest marine cable that holds the ABYC three percent voltage drop limit for 40 amps over a 30 foot run at 12, 24 and 36 volts, with the drop each gauge would actually produce.
• What wire gauge does 50 amps need over a 5 foot run? The smallest marine cable that holds the ABYC three percent voltage drop limit for 50 amps over a 5 foot run at 12, 24 and 36 volts, with the drop each gauge would actually produce.
• What wire gauge does 50 amps need over a 10 foot run? The smallest marine cable that holds the ABYC three percent voltage drop limit for 50 amps over a 10 foot run at 12, 24 and 36 volts, with the drop each gauge would actually produce.
• What wire gauge does 50 amps need over a 15 foot run? The smallest marine cable that holds the ABYC three percent voltage drop limit for 50 amps over a 15 foot run at 12, 24 and 36 volts, with the drop each gauge would actually produce.
• What wire gauge does 50 amps need over a 20 foot run? The smallest marine cable that holds the ABYC three percent voltage drop limit for 50 amps over a 20 foot run at 12, 24 and 36 volts, with the drop each gauge would actually produce.
• What wire gauge does 50 amps need over a 25 foot run? The smallest marine cable that holds the ABYC three percent voltage drop limit for 50 amps over a 25 foot run at 12, 24 and 36 volts, with the drop each gauge would actually produce.
• What wire gauge does 50 amps need over a 30 foot run? The smallest marine cable that holds the ABYC three percent voltage drop limit for 50 amps over a 30 foot run at 12, 24 and 36 volts, with the drop each gauge would actually produce.
• What wire gauge does 60 amps need over a 5 foot run? The smallest marine cable that holds the ABYC three percent voltage drop limit for 60 amps over a 5 foot run at 12, 24 and 36 volts, with the drop each gauge would actually produce.
• What wire gauge does 60 amps need over a 10 foot run? The smallest marine cable that holds the ABYC three percent voltage drop limit for 60 amps over a 10 foot run at 12, 24 and 36 volts, with the drop each gauge would actually produce.
• What wire gauge does 60 amps need over a 15 foot run? The smallest marine cable that holds the ABYC three percent voltage drop limit for 60 amps over a 15 foot run at 12, 24 and 36 volts, with the drop each gauge would actually produce.
• What wire gauge does 60 amps need over a 20 foot run? The smallest marine cable that holds the ABYC three percent voltage drop limit for 60 amps over a 20 foot run at 12, 24 and 36 volts, with the drop each gauge would actually produce.
• What wire gauge does 60 amps need over a 25 foot run? The smallest marine cable that holds the ABYC three percent voltage drop limit for 60 amps over a 25 foot run at 12, 24 and 36 volts, with the drop each gauge would actually produce.
• What wire gauge does 60 amps need over a 30 foot run? The smallest marine cable that holds the ABYC three percent voltage drop limit for 60 amps over a 30 foot run at 12, 24 and 36 volts, with the drop each gauge would actually produce.

Researched, not professional advice. Every figure on these pages is labelled as a published engineering or manufacturer figure, a rule of thumb, or something that only exists on your own boat. Where a published figure does not exist we say so rather than estimating one. The capacity plate on your boat, the manual for your own equipment and ABYC E-11 for anything electrical are what govern.