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Old 02-03-2009, 13:18   #1
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Location: Puget Sound, Washington
Boat: s/v Annapurna (Contessa 26)
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AC grounding wire to Engine terminal

Hello folks,

Had a question, I'm in the middle of wiring my boat for shore power. I have the receptacle in, and from there the grounding wire then runs to a galvanic isolator, and then I plan to put in a bus. Everything up to this point is 10-gauge wire. From there it'll branch to my circuit breaker, and to my engine's negative terminal. Should I use a 10-gauge or an 8-gauge wire from my engine to the bus? On my DC circuit, it's an 8-gauge going from the battery to the breaker, I assume this is because DC faults can create a lot of heat-inducing current, but everything else on the AC circuit up to now has been 10, so it makes me curious.

Thank you
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Old 02-03-2009, 16:53   #2
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You should be able to find the information here

http://www.boatdesign.net/boat-desig...ricalGuide.pdf

Keep in mind that this document has been superceded, so use at your own risk.
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Old 02-03-2009, 19:17   #3
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Thank you for the link, I'll have a looksy.

By the way, it's a 30A system.
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