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Wire Size Application Guide

I found this table in Nigel Calder's book Boatowner's Mechanical and Electrical Manual.

Note that this is for 12 volt applications only. Other tables exist for different voltages.
These sizes are based on a 3% drop in voltage.

  Conductor length - current source to device and back
  10 feet 15 feet 20 feet 25 feet
5 amps 18 ga 16 ga 14 ga 12 ga
10 amps 14 ga 12 ga 10 ga 10 ga
15 amps 12 ga 10 ga 10 ga 8 ga
20 amps 10 ga 10 ga 8 ga 6 ga
25 amps 10 ga 8 ga 6 ga 6 ga
 

Article By: David J. Morrow

August 2001

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