60v stray voltage is this a problem? Any charts / guides for acceptable amounts?

jd-woodlands

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Been having issues with an apex port that my heaters are connected to, so worked on it this morning to troubleshoot. Hands in water I feel I a good amount of electrical current on some nicks and cuts on my hand.

grab the electrical and test, 60v - 90v of current... should I be concerned? Turned off heaters one by one, and isolated one with +50V of leakage. (Cobalt Neo therm).

Should I discontinue use of this heater?

how much is too much stray voltage?

Should I be measuring amperage or resistance?

Any charts or guides on acceptable values?
 
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motortrendz

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Yea that's definitly too much. I've only ever measured about 3 or 4 volts. Once I added a ground probe I read zero. But that much is pointing towards a bad heater.
 

Miller535

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You measure in voltage. I would expect to see zero, I could possibly be ok with .1, .3 volts or something. Anything else is not ok
 
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jd-woodlands

jd-woodlands

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Hmmm ok, thanks for the inputs, when I turn the suspect one off I Get down to 12v, a few more devices off I get down a few more volts lower at a time.

guess I’ll trash that heater and setup a grounding probe To be safe if that will fix it?

or does it sound like I have some other issue?

Any quick links to setting up a grounding probe?
 

madweazl

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Hmmm ok, thanks for the inputs, when I turn the suspect one off I Get down to 12v, a few more devices off I get down a few more volts lower at a time.

guess I’ll trash that heater and setup a grounding probe To be safe if that will fix it?

or does it sound like I have some other issue?

Any quick links to setting up a grounding probe?
Looks like you're going about it the right way. Just unplug a single device at a time to find what is creating the issue(s). If you can avoid submerging the heater, do so (one less thing to worry about). I believe under 40 is considered low voltage.
 

Miller535

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I would try the grounding probe. I believe the rule of thumb with a grounding probe is just to put it as close to your heaters and pumps as possible. The one I have screws to the ground screw of an outlet. I like that because it can't be bumped or accidentally pulled out.

I have this one:
 

LobsterOfJustice

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Trash that heater ASAP. What your are describing is typical. It is hard to find anyone recommending a definitive amount but somewhere in the 8-12 V range (total) is reasonable. Typically you will get multiple devices each contributing a few V each. You can’t replace everything so that you just have to live with. But if you can identify any single piece of equipment contributing 10 or more V just by itself, that is no good and needs to be replaced.
 
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jd-woodlands

jd-woodlands

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Thanks all for the info, trashed the Cobalt NeoTherm 100w (already RMA once, this was a replacement they sent) that was putting out 50V+of stray voltage.

That dropped me to 9V total, installed a grounding probe today and went to 0.3V.

assuming this was the cause of losing a nice male blue throat trigger, was perfectly fine and healthy. Also had a few jumpers lately as well that went tile surfing - could have contributed there as well.
 

Joekovar

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Well, old POTS phone lines would put out about 70v when someone was holding the wire and you called the line, which was enough to make them jump and call you a m**********r.

I could definitely see 50 being enough to have fish trying to jump out of the tank.
 

Cory

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Measure the amperage the same way you did voltage. Amperage is a true electrical leak. Stray voltage is usually induced magnetic fields producing voltage from the water around it. But 50v is most likely leaking amperage too.
 
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LobsterOfJustice

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Thanks all for the info, trashed the Cobalt NeoTherm 100w (already RMA once, this was a replacement they sent) that was putting out 50V+of stray voltage.

That dropped me to 9V total, installed a grounding probe today and went to 0.3V.

assuming this was the cause of losing a nice male blue throat trigger, was perfectly fine and healthy. Also had a few jumpers lately as well that went tile surfing - could have contributed there as well.
To be clear, adding a grounding probe does not solve the source of the remaining voltage - it just gives voltage (potential) a path to ground, turning it into current. The electricity is still there, it’s just that you can’t measure it when it’s grounded.
 

W1ngz

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60v is definitely high, but voltage isn't the problem. A perfectly functioning tank that isn't grounded will still show a voltage because of the motors and heater coils that are sitting in a saltwater electrolyte. Depending on the equipment you have that might be 0.1v, it might be 20v or 30v, but it's a meaningless number since electricity is carried by current, voltage is just the potential of how much current there could be.

To properly isolate and identify the offending equipment, you need a ground probe and a GFCI outlet. When too much current passes through the ground instead of the outlet, the GFCI will pop letting you know that something dangerous is going on in the tank.
 

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