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View Full Version : A hint that might save your life



falcondob
Thu, 23rd Jun 2005, 10:54 AM
Just thought I would pass this along, it could have cost me my life.

I had an electrician run some dedicated lines into my aquarium area, for lights and such. He installed new breakers at the main box, ran some pipe, and installed a small breaker box on the aquarium so that I could shut the entire system (or just one circuit) down for maintanence or in an emergency. To save some money, I told him I would run the line to the GFIC outlets and install the boxes. When he left I told him to leave the breaker off outside and I would turn it on when I was finished. Later that night I went outside and checked to make sure the breaker was off. It was. I didn't have the time to install that day; so it had to wait.

A couple of days later, the A/C guy came and installed my new A/C unit. We had him move it around the corner (for noise and to allow us to expand the deck.) In the process he had to rewire the circuit.

That night I started to wire up the GFIC outlets. Looking in the box I remembered what it is like to get a nasty shock (I was an Electronics Tech in the Navy) and decided to go and make sure the breaker was off. When I went outside, sure enough, ALL the breakers were on. If I had stuck my hand in the box, there is a good possibility I might not be here to write this.

PLEASE TAKE NOTE!
When you are working with electricity, for any reason, turn the breaker off and flag it. You can use tape, fluorescent yellow or red plastic tape, anything to let others know the circuit needs to remain off. School your family in what the flags mean.

Also, make sure you have a grounding wire in the water of your tank(s). They are a really cheap insurance policy for you, your family, and the inhabitants of your system.

THIS IS THE MOST DANGEROUS THING YOU CAN DO WHEN WORKING WITH YOUR AQUARIUM!

Sorry for being so preachy, but I would rather be accused of that than attend a funeral.

Thanks and be safe,
John

greasemonkey
Thu, 23rd Jun 2005, 12:20 PM
Falcondob,
Remember red tagging things so someone doesnt use it while your working on it? I make my own tags so someone will at least ask me why somethings off. Just a thought.

alton
Thu, 23rd Jun 2005, 12:52 PM
One thing to add to the grounding probe in your sump or tank, make sure you have a good ground at your service and that the ground you are plugging into does not read any voltage. If you do not have a good ground at your service or your neutral bar is not grounded at the service it will use the water in your tank as a grounding source! I have found voltage as little as 5 volts will shock the heck out of you when you mix it with water.

schoeplein
Thu, 23rd Jun 2005, 01:02 PM
One thing to add to the grounding probe in your sump or tank, make sure you have a good ground at your service and that the ground you are plugging into does not read any voltage. If you do not have a good ground at your service or your neutral bar is not grounded at the service it will use the water in your tank as a grounding source! I have found voltage as little as 5 volts will shock the heck out of you when you mix it with water.

...the intensity of the shock is based mostly on amps ;)

5V, 100A and you're toasted. Good thing our lines are 120V and typically units are only pulling mA's....

falcondob
Thu, 23rd Jun 2005, 01:05 PM
All great suggestions. I read a thread (on RC I think) about the number of aquarium hobbyists (salt, fresh, pond) and even commercial people who killed each year by electricity associated with the hobby. I don't remember the number, but it was enough to make take safety measures.

Thanks for all the great input,
John

pilot_bell777
Thu, 23rd Jun 2005, 01:47 PM
My grandfather owns his own electrical company and I did electrician work with him sense I can remember. (Got out of it though and into computers ;) )

I got hung up one time after he told me that a entire row of lights was disconnected with no power. When I got down I could only see yellow for about a minute and my heart was racing very fast. >_<

When I gripped at him and said that you told me the row was off....he laughed and said that is why YOU have an electrical tester and should always test before you touch! LOL :lol Guess he told me!

You can get a tester at Home Depot for like 5$ (cheap one with nothing but a light on it) and they are well worth it IMO!. :D

alton
Thu, 23rd Jun 2005, 03:08 PM
In the right conditions it only takes 5 ma to stop your heart thats why the new GFCI receptacles are set to trip at 4ma! And remember most GFCI receptacles fail on not off thats why they need to be tested often.

alton
Thu, 23rd Jun 2005, 03:16 PM
One for the engineers out there, if you cut a 12 gauge wire attached to a 20 amp 120v breaker and short it out 2' from the breaker with a ground wire, what would the short circuit amperage be? There is a reason that little $2.50 breaker is rated at 10,000 AIC.

captexas
Thu, 23rd Jun 2005, 04:54 PM
Funny on the timing of this thread, I got electrocuted at work today! **** electricians had unterminated wires sticking out of some flex in a celing I was working in. Didn't think much of it as there were no wire nuts on the end of the wires and unterminated wires are normal for a construction site. I found out the hard way that the morons had made the circuits hot, got shocked in the arm while climbing down my ladder. I've been shocked plenty of times with my job, but this one bit me pretty good! :wacko

As Alton mentioned, it surprisingly doesn't take much to do some damage so always be extra careful, especially around water.

Thunderkat
Fri, 24th Jun 2005, 08:06 AM
The Navy does something similar. We place a "danger/red tag" on valves and switches that are not suppose to be moved and if anybody moves the valves position then that person loses rank and money due to the danger to somebody's life.