[LIforrelaxin]

So here is the thing.... it is simple as much as reasonable possible keep electricity away from the water...... While there may be an allure to having docks or a power outlet on your dock, why do you believe you need it. Can you solve the problem another way?

In a Marina setting, where boats need shore power because people live on them etc. It has to be a concern and I get that.

But should your average citizen have a need to have power down at their dock? I don't think so.... But yet I know many do it. I don't even pull an extension cord down on my dock to charge a battery if I know people are going to be swimming.

None of this is rocket science... be smart....

If your concerned about it, an alarm like ishoot308 posted seems like a reasonable investment, and helps with piece of mind, to make sure there is no consistent threat. What can't be prevented however is when an electrical line becomes suddenly exposed, and all hell breaks loose until what ever breaker of fuse it is connected to blows.... There is simply nothing you can do, to be 100% safe... Giving yourself a piece of mind is what you need to look at.