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What is a galvanic isolator and why should my shore power system have one?

A galvanic isolator is a device used to block low voltage DC currents coming on board your boat on the shore power ground wire.  These currents could cause corrosion to your underwater metals; through hulls, propeller, shaft etc.

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How to test a galvanic isolator that doesn't have a monitoring system

Galvanic isolators are a bit difficult to test.  Current ABYC standards require that galvanic isolators be self testing.  For testing older isolators without this feature there are a number of methods that can be used, the one that follows is one that I found most useful.
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Isolation Transformer or Galvanic Isolator - which is preferable?

A discussion on the relative merits of transformers and galvanic isolators
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