What Twistedtree said nails it. I have had to run this problem to ground for several customers. The marina has taken the cheap way out and put one RCD on the dock. So one boat with a leak and the whole dock goes out. Here on the upper east coast we have seen this problem for two years. The best but most expensive solution is to put the RCD in each power post. That way only the troublesome boat trips out.
There have been a number of electric shock drownings in fresh water locations due to AC current leakage into the water. The RCD solves that problem. The standards organizations have applied the freshwater solution to saltwater marinas although the issue is a freshwater problem.
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