When a boat is connected to a mains shore supply, the shore earth conductor is connected to the boats pending system which includes the hull shafts, propellers and the anodes.
If a second boat is connected to the mains shore supply, then both boats, and any other boats, including a steel jetty, are connected to you via the earth conductor which is bonded to earth.
When a potential difference exists in the common earth conductor, galvanic corrosion will take place and your sacrificial anodes will dissolve.
The anodes will dissolve at an alarming rate, if other boats, pontoons or steel jetty are not as well protected as your boat.
A galvanic isolator fitted in series with the AC earth conductor maintains a good earth link with the shore but blocks any stray low voltage, DC galvanic current and allows the passage of alternating current associated with the earth conductor.
It will not protect against a fault condition if the voltage differential is greater than 1.6v DC.
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Please call for further information.
Tel +44 (0)1902 380494
Address ADVERC BM Ltd, 245 Trysull Road, Merry Hill,
Wolverhampton, West Midlands. WV3 7LG