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Old 01-19-2012, 06:39 PM   #31
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GFCI special application--on demand for brief period


It would isolate the ground from the conductors - minimizing the potential of getting shocked. No GFCI would be needed.

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Old 01-19-2012, 08:52 PM   #32
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GFCI special application--on demand for brief period


I think you're mostly correct about the electrical hazard affecting only humans, not the livestock. Much has been written about electric shock in water. The general consensus seems to be that salt water is so much more conductive than the human body that electric shock in open salt water is nearly impossible without touching an electrified object. The highly conductive salt water effectively forms a faraday cage around the person, and the potential difference across the body is too small to be dangerous. Fresh water is not adequately conductive, and current flow around a person in fresh water is extremely dangerous. Thus, livestock in a salt tank should have very little current flow through them even if current flows through the water. Additionally, a ground fault in the tank is unlikely to result in much current flow at all since the tank is isolated from ground - until a grounded human reaches in!

An isolation transformer may be a good solution for you. It's not as good as GFCI, because it doesn't provide any indication of when a fault has occurred and thus can't be monitored easily. However, it will greatly reduce the danger.
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Old 01-20-2012, 08:04 AM   #33
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GFCI special application--on demand for brief period


Quote:
Originally Posted by EvilNCarnate View Post
I use a UPS on my aquarium and thats it. I protect myself from power outages but dont worry about a short in the equipment, if I were going to worry about that I would probably look at buying something to detect current in the tank instead of putting it on a GFCI that could trip on accident.


http://saltaquarium.about.com/od/aqu...rayvoltage.htm

Quote:
Originally Posted by highdeserthome View Post
A UPS is for power interruption.

It does not help when there is a fault.
I am well aware of that, you should read the context and not just the first sentence. In addition the link I supplied explains how a reef hobbyest can test for stray voltage in their tank.

Helpful hint, the " symbol under each post allows you to select multiple posts for quoting, you click each " then finally you click Quote on the last post. This will allow you to reply to each post in one reply. When you get really good you can learn to move quote tags to put two posts blocked together like I did above.
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Old 01-20-2012, 11:19 AM   #34
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GFCI special application--on demand for brief period


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Originally Posted by EvilNCarnate View Post
I am well aware of that, you should read the context and not just the first sentence. In addition the link I supplied explains how a reef hobbyest can test for stray voltage in their tank.

Helpful hint, the " symbol under each post allows you to select multiple posts for quoting, you click each " then finally you click Quote on the last post. This will allow you to reply to each post in one reply. When you get really good you can learn to move quote tags to put two posts blocked together like I did above.
Thanks

The test of leak using a voltmeter is good for its own reason. It is to detect existing leak at one moment in time. It does not help in reducing the risk of shock if a leak develops since the last test, however. (The act of handling a pump may cause looseness of AC connection to open)

The use of a titainum rod, one end dipped into the tank water the other to ground, has long been used, only recently this method has not been discussed much, it seems.


Last edited by highdeserthome; 01-20-2012 at 11:22 AM.
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