From Todd Weiller:
The latest on Electrical Safety in Marinas this month from the International Association of Electrical Inspectors. A good read to know what’s going on around a marina whether at SSYC or elsewhere.
As little as one milliampere can cause a tingle. At 30 milliamps an individual “freezes” and can’t let go. At 1,000 milliamperes or 1 amp from a 30 AMP standard boat cord set stops the rhythmic pumping action of the heart causing muscular contraction and nerve damage. Death is likely. On that scale, a 30 Amp cord carries enough juice to kill 30 people. That should earn it some respect.
If we are going to be safe and provide a HEPA vac, why not electrical safe then? A simple device you can carry in your pocket is a polarity tester. Plug it into any outlet and it will tell you if you reversed the neutrals and are pumping live current into the water or elsewhere. $5.25 with free shipping on Amazon. It could save a life. http://www.amazon.com/Electrical-Receptacle-Outlet-Ground-Tester/dp/B0012DHVQ0/ref=sr_1_5?ie=UTF8&qid=1405466462&sr=8-5&keywords=polarity+checker
(If and unusual amount of alewives are dying around your boat at the dock, you might have this problem!)