Originally Posted by US1Fountain
Yes, I'm aware of that and also that my boat has no common connection between the 2, which explains why the no tone when shorepower cord disconnected. I just wasn't sure what to expect when going thru the galv. isolator. So my findings are correct then, right?
Your boat shouldn't, which is why GFI's don't like generators which sometimes float the neutral on boats. I'm not an electrical engineer
, but I understand the concept
, so I'll TRY to explain (any EE's feel free to step in here)......
(think 120V) has to run in a circuit and polarity is switched back and forth. DC (think 12V systems) have constant polarity. Your underwater metals are (hopefully) bonded to the DC ground.... I'm not getting into galvanic isolators here.... IF, the AC neutral gets grounded and there is an interconnection to the DC ground, you get 2 issues: a shock hazard between metallic objects and sea water
, and electrolysis
of your underwater metals.
Zincs are installed as a sacrificial anode to protect the harder (more noble) metals of props, shafts, through hulls etc. I have chased grounded neutrals down to silly things like microwave ovens and televisions.
So.... (here we go again with the "many") Many boats do not connect the AC neutral and ground as it shouldn't be, so to the OP, your boat seems to be wired correctly based on your findings. My apologies if the concept
in my head
didn't make it out in type!