Thread: Over zinc'd?
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Old 02-25-2018, 11:14 AM   #8
Gordon J
Guru
 
City: Hampton, va
Country: USA
Vessel Name: Didi Mau
Vessel Model: 2003 Ocean Alexander 456
Join Date: Jul 2015
Posts: 938
I had similar readings

Quote:
Originally Posted by CharlieJ View Post
Those readings tell me that the vessel is not isolated from the shore safety ground system. The galvanic isolator is either bypassed or it has failed.

To be galvanically isolated the hull potential should not change between the shore power plugged in and the shore power unplugged readings.

A fiberglass boat with no underwater aluminum components (sail drive, outboards, Zeus pods, etc.) can not be "over zinc'd". This is another dockside myth.
And then found that the galvanic isolated installed by the ptrevious owner was mistakenly installed on generator ground, not the shore ground.
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