Ultimately if the on-board AC power generation is connected to the metal
structure of the ship, then I'd think it is the same as on land, except the
ship hull superstructure is the 'ground'.
In fact, you might have a 'better' ground on a ship since the metal
structure of the ship is exposed in more situations ('ground' is all around
on a ship, as compared to the paths to earth ground on land; cold water
pipes, ground rods, green/yellow wires, conduit, RF grounds, etc), so
there's more opportunities for a fault to 'ground out' and trip an upstream
overcurrent protection device.
I'm thinking mostly of large military ships - if you're talking about
fiberglass (or wooden!) pleasure craft then the story is less clear, but I
believe they often have a common grounding point too; it's just much
smaller.
-Ken A
On Mon, Jul 8, 2019 at 2:19 PM <[email protected]>
wrote:
> Hello group,
>
> Is there a real ground in a ship? i.e if a Class I product is used on the
> board of a ship, does the ground pin actually doing anything? The ship is
> floating in the ocean and I cannot understand if there is a real ground
> there or not? Can you guys educate me please?
>
> Thank you
> Peter
> -
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