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trontek
#1 Posted : Thursday, July 08, 2010 8:48:35 AM(UTC)
trontek

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Did our search this subject - nothing came up. Searched the web and got into this:http://www.boatingwithdawsons.com/boating-articles/major-harbour-danger-electric-shock.html

I still can not make sense of what is going on(looked up voltage gradients - still confused). Do we wind up with different voltage levels in the water and current flows thru our bodys when we connect those different levels together??Eh?
Jim

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fastjeff
#2 Posted : Thursday, July 08, 2010 10:49:59 AM(UTC)
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Man, when I think of the times I went in te water while our boat was in the slip.... Dumb, really dumb!

Jeff
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SORRYDOG2
#3 Posted : Thursday, July 08, 2010 2:36:46 PM(UTC)
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My Dad, used tell tell me-DON'T BE THE GROUND!!!!! When my buddies where playing baseball I was laying up under houses in the wet mud wiring ing the electric, he always wired every thing HOT!! that way you didn't have to crawl out and run upstairs to turn on the breaker!! I still remember getting shocked from TOUCHING THE GROUND OR BEGOMING THE GROUND-SAYING A UNHOLY WORD, and him scooting over and smacking me saying!! I TOLD YOU -DON'T BECOME THE GROUND!!!!! G--DARNIT- -NOT HIS EXACT WORDS-When I lived in Oak Ridge Tenn, we had a metal dock, I had at the time a Metal Stardust Houseboat. If you stepped on the boat barefoot you would feel a tingeling, also if you jump in the water and swam up to te boat and touched the mtal handrail you got tinngeled. From some of the braincells I have left I am thinging we grounded the dock to land as, ground under our boats is always seaching ie-electrolyices-. Having a Dad, who was an ellectrical, mechanicl, and a chemical engineer--I have been the earley learner of the powers of PERPETUAL MOTION!!!! The hard way!!!-Sorrydog
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trontek
#4 Posted : Saturday, July 10, 2010 2:13:17 AM(UTC)
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http://www.boatingwithda...e-dockside-tragedy.html

For those who have not seen this....

Any thoughts as yet on technical end of what actually happens with the voltage gradients and a body in the water?

After reading the article over several times, I think it finally makes sense to me. Thanks for considering my puzzlement.
Jim

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trontek
#5 Posted : Saturday, July 10, 2010 3:18:01 AM(UTC)
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Another interesting link on the subject....http://bluesea.com/viewresource/1381

Have to copy & paste as it would not highlight as link for me.
Jim

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Jack Marchand
#6 Posted : Wednesday, July 21, 2010 3:41:44 AM(UTC)
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There is so much to this it's hard to begin, but to keep this short and to the point, GFCI's sense an equal flow on the black and white leads of 120v systems, if the sensor does detect an imbalance, it shuts down the system within a couple of milliseconds. BUT, GFI's DO NOT protect anything prior to the device (dockline, point of attachment and up to the device). The only way I can see being protected by a GFI is if it is at the dock (point of attachment) not in the boat, protecting the whole system downstream. Also any device (GFI) inside your boat does not like being downstream of another GFI upstream, it won't act right which will lead to other issues if you have them in your boat and attach to them dockside, too.
75 FB express, "Big Enough II" twin 318s, 950hrs, raw water cooling, 1 to 1 transmisions, Beautiful Lake Charlevoix, MI
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dougrose
#7 Posted : Thursday, July 22, 2010 8:00:43 AM(UTC)
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A gfi is great, but don't overlook the troubleshooting. If one of the neutral lines shorts to the ground or hull, the gfi trips. You must then find the problem before you can use any ac power.

The way to find it is to disconnect circuits one at a time until the gfi does not trip. Most Ms have eight circuits and no convenient way to disconnect them. The neutrals are all tied together to a bus bar at the ac panel that is tough to work with, and the wires are not marked.

One way to make this work is to use a socket and plug for each circuit. When you find the bad one you can leave it unplugged and still have some lights and power while looking for the problem. The entire circuit will need to be checked, unplug everything and plug the circuit in. then plug stuff back in until you find the problem.


1975 32' Flybridge Sedan, twin Perkins 6-354 diesels, 1:1.53 velvetdrives, 16 X 19 props. Merritt Island, Florida
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