In my direct experience the safety link is where corrosion starts. I suspect dissimilar metals in a saltwater bath generate electrical fields sufficient to accelerate corrosion by electrolysis... ie dielectric or galvanic corrosion.
Yes, if you have dissimilar metals, an electrolyte (like salt water), and the right conditions, you can get galvanic corrosion. Nothing to do with dielectrics.
But where is the dissimilar metal here?
