wire-wright

Pick the DC wire size and fuse for one boat circuit, and see which rule decided it.

Circuit Current (A) Round-trip length (ft) System voltage Critical circuit (3% drop, not 10%) Passes through an engine space Bundled conductors

Wire size

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Fuse

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Same math as npx wire-wright, from the ABYC E-11 tables in the ampacity data package (republished with ABYC's permission at boathowto.com). DC, copper only, AWG 18 – 4/0. For a whole circuit list, see the command-line tool.