[electricboats] How are you grounding your AC (shore power) and your 12 VDC subsystems?

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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