Remember that the Length is a round-trip distance. The wire size will change based on various factors, like wire material, voltage drop, and distance. Use 10% voltage drop for non-critical applications such as windlass, cabin lights, circuits other than running lights, electronics or panel board feeds. The best wire size for 50 amp service is a 6 AWG wire. Use 3% voltage drop for critical applications affecting the safety of your boat and crew, such as running lights, blowers, electronics and panel board feeds. If 7–24 conductors are bundled, reduce amperage by 50 percent. If 4–6 conductors are bundled, reduce maximum amperage by 40 percent. Conductors are not bundled: If three conductors are bundled, reduce maximum amperage by 30 percent.Wires are not run in engine spaces: Maximum current is 15 percent less in engine spaces, which are assumed to be 20☌ hotter than non-engine spaces (50☌ vs. SAE wire sizes are 6 to 12 percent smaller, carry proportionally less current, and have greater resistance
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