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Author Topic:   Wire Size for Navigation Lamp
Binkster posted 05-01-2013 10:15 AM ET (US)   Profile for Binkster   Send Email to Binkster  
Since I'm installing a new rubrail on my 15 -footer, I need to run new wiring. What size wires should I use?
jimh posted 05-01-2013 11:11 AM ET (US)     Profile for jimh  Send Email to jimh     
The minimum wire size to use on a boat is 16-AWG per federal regulations. A conductor of 16-AWG can carry 2-Amperes for 30-feet and have less than 3-percent voltage drop in a 12-Volt circuit. You can compute wire sizes for a particular voltage, voltage drop percentage, length, and current with the calculator at

jimh posted 05-01-2013 11:14 AM ET (US)     Profile for jimh  Send Email to jimh     
MARINCO has also pre-computed wire sizes for 3-percent voltage drop at 12-Volts in a nice table. See

Binkster posted 05-01-2013 03:37 PM ET (US)     Profile for Binkster  Send Email to Binkster     
Thanks jimh


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