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Old 30-09-2009, 17:36   #16
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This is a very opinionated topic, one surveyor will say yes, they should be joined, another will say no. Most older boats will habe the DC and AC grounds bonded as somebody in the boats history will have joined them, on purpose or mistakenly.
All marine gensets should have the neutral and ground one and the same, therefore the Dc and AC grounds are joined. Another case of 'I like the CQR, you like the Delta' scenario
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Old 30-09-2009, 22:19   #17
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Who said electrics were easy? ;-)

Normally, the AC neutral is grounded at the generating site, like a power station, a genset and even an inverter. You should never jumper AC ground to AC neutral at your bus bars or switch panel. This is why your Genset-Off-Shore transfer switch is important: it isolates the ground-to-neutral jumper in your genset from the system when on shore power.

The ABYC is a nice club, but what they write are recommendations and not requirements. It's also a US club and other nations have great minds too and sometimes decide on a different setup, like no connection between AC ground and DC negative. This argument will never end because there are good reasons for both approaches. I have my DC isolated from AC including AC ground, i.e. the EU approach.

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Old 01-10-2009, 08:25   #18
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I agree with s/v Jedi, with a resdual current interrupter ( aka GFCI) and then do not connect the AC ground/protective earth and DC negative. Far too many noise loops, resdiual current, impressed corrosions problems result. The interruptor takes care of the safety aspect.

Really The ABYC approach is overkill and ommits ( until recently) the advantages of whole boats RCD breakers. connecting AC earth and DC negative only really adds a small bit of extra protection anyway, The major metal objects in a boat tend to be connected to earth via seawater anyway and hence will trigger the RCD device anyway.
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