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Go Back   SailNet Community > On Board > Gear & Maintenance > Electrical Systems
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Old 12-25-2013
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Galvanic isolator question for the electrical experts

I have a galvanic isolator, and I can see where the output side is connected to a bus that sends green wires to all the A/C outlets.

What I can't see is a connection between this bus and the DC ground. I could have one and it's hidden. But to make sure, is it a simple matter of running a wire from the bus to a good DC ground (ie, the engine in my case)?

My understanding is that this is necessary for safety.
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Re: Galvanic isolator question for the electrical experts

That is correct, per ABYC. To make sure measure for continuity between the DC negative and the AC ground (green wire) bus with a simple multimeter.

A simpler solution for the wiring is a 10 awg green wire between the DC negative bus and the AC ground bus. Best to keep only one ground connection to the engine.
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Re: Galvanic isolator question for the electrical experts

Good point, those two buses are within a foot of each other inside the breaker box!
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Re: Galvanic isolator question for the electrical experts

If you search the web, you'll find some differing opinions on grounding theory. This West Marine article does a good job explaining most of the concepts though.

http://www.westmarine.com/webapp/wcs...s#.UrqNv3q9KK0
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