The subject of safety earthing of boat shore power connections will be subject to local electrical standards and is probably different in each country. In Australia, you are subject to AS3004.
I seem to recall an entire section on earthing (and the possibility of galvanic loops) in the standard. I went to look, but while my employer has access to all standards, I don't have the required DRM software on my computer to view more than the index pages.
So depending on your location, you may be subject to national or international electrical standards.
Interaction between the shore power safety earth and the earthing system employed on the boat is complicated and if you get it wrong, you just don't damage your boat, metal parts underwater on your neighbours can be damaged as well.
Definitely an area you should seek expert advice on.
On Sat, 30 Jul 2022 at 23:24, THOMAS VANDERMEULEN <tvinypsi@gmail.com> wrote:
A question to those of you who no longer have an ICE with altenator and therefore no engine negative bus for attaching a 12 VAC safety ground (green) wire to: where are you now connecting your AC safety ground wire?
Best practice seems to be to isolate our 48+ VDC propulsion system's electrical components; but are you grounding any non-current carrying components of your 48+ VDC system or of your 12 VDC boat and/or 12 VDC propulsion system control and monitoring sub-system? If you are, to what ultimately are you connecting these ground lines?
I've been communicating with technical support at ABYC to get clarifications of their standard E-11, but I'm curious about what people are actually doing out there.
Thanks!
[-tv]
Thomas VanderMeulen
"Grace O'Malley"
Cape Dory 27
Montroe, MI
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