[CBerryhill]

:eek: Our swimming pool pump is grounded to the ladder in the pool and also to a copper grounding rod in the ground. The problem is when you touch the wet concrete around the pool while touching the water in the pool you get a mild shock. We've checked it with a voltage meter{the blk. Electrode on the wet concrete and the red electrode in the pool water} we get a reading of .47 on one end of the pool and .14 on the other end. Someone told me it was just static electricity but it really scares me. I'm afraid to let the kids swim until we figure out what is wrong. If you have any suggestions they would be greatly appreciated. I'm very worried somebody could be electrocuted. PLEASE HELP! Oh, by the way when I turn off the breaker feeding the pool, it still shocks us and there is no juice supposed to be there at all with the breaker tripped. I'm so confused about this.

[tkrussell]

The voltages you measured are to low to offer any shock. But since you feel something, and just in case your not reading the meter properly , this may be best checked by a pro. There are so many possibilities for a reason.

[Stratmando]

Something may be shorting or leaking to ground. Turn off breakers one by one, until voltage
Not present. Any landscape lighting running under pool deck? An amprobe to check current on ground wires in panel may help locate. Grounds should not have current.

[dkmason]

We have also been having the same problem with mild shocks in our pool. At first, I thought it was a chemical reaction with the pool chemicals and cuts and abrasions on our feet. However, it doesn't happen all the time and everything on my pool is grounded. We are not touching pool ladders when we get out of the pool. And, it has happened when I put my hand into the water to clean the filter. Our pool guy is stumped. Do you have a fiberglass pool? We have a fiberglass pool and just installed a salt system in May 2007. We are wondering whether there may be a correlation to using a large amount of Les-Iron to treat the metals in our pool. Would love to know if you have resolved this problem? My kids are afraid to get in and out of our pool.

[Stratmando]

If everything grounded and at ground potential is good protection, If you can hook up meter and determine what is making things live, When you turn off breaker to Pump you no longer get shocked(read voltage)? Physically you should be able to see ground continuity, ground rod, all need to be intact. Motor usually first culprit, when lights go on?

[dkmason]

I had an electrician and 2 pool people here to investigate. Everything is grounded, no voltage registering on meter with pool on and off (equpiment off and unplugged). We are still getting shocked (feels like a bee sting) when pool equipment off and we step out (one foot on wet concrete deck and one foot in pool). It happens when the pool is active with swimmers. Could it be static electricity conducted through salt water? It doesn't happen all the time nor to everyone in pool!!

[tkrussell]

Did they use a standard volt meter? Probably should use a millivolt meter to capture the apparent low level of voltage.

I doubt this is static.

There have been case of underground wiring beneath the pool causing something similar to this.

Could be fault currents flowing in the concrete.

[Stratmando]

Were you able to turn off ALL breakers? Turn off all, and Main. Then turn on one by one.
Had a call one time, someone getting shocked in bathtub, it was pinched phone wire.
Do you have a solar panel? Need to remove any and all potential voltages, breakers, and phone, then apply one by one until it appears.

[KISS]

These problems are really tough. Your run of the mill electrician may have a difficult time finding it. It also may require special tools, like insulation testers, ground impedance meters and ground current meters. These may not be in everybodies tool box. An industrial electrician has a better chance of having them.

The pool is fed by a GFCI breaker isn't it?

[biggsie]

Having worked with electricity in a wet environment and think I can explain the

Problem... You are standing on wet concrete and are grounded, the pool is at a

Different potential ( I think there is a posible 110 volt potential in the pool which

Comes from pump ) which explains why you get shocked...

The way I see it the wires coming from the breaker need to be checked for

Voltage with the breaker off, there should be no voltage at the pump, hope it

Is wired properly, it should be fed from a gfi breaker... It is possible that the

Pump motor is the problem, an internal short to the motor case would make

The motor case hot (voltage) and the pump transfers it to the pool... A meggar

Will check for short in the motor wiring to the case... dissconnecting wiring at

Pump motor should stop the shock at pool... check and see

[dkmason]

Thank you all for your assistance. So far, we have been able to troubleshoot one area of concern. The pool does not have a girlfriend breaker! Also wondering if problem may be with ladder and handrail (by steps). Both are grounded and bonded with underground wiring under the concrete deck. The pool is a 6 year old, fiberglass pool (no solar panel) . My husband and I both got this little sting when we put our hands into the filter and had the other hand on wet concrete deck. We felt the quick sting (like a bee sting) on hand that had an abrasion or cut but not on other hand. My kids have also had cuts/abrasions on feet when they felt it. The sting is enough for the person to quickly draw your hand back. (it is significant) So, is this electrical or chemical? As stated before, it doesn't happen all the time and not to all those in the pool. (also realizing that others have higher pain tolerance). And, we converted to a salt system in May.

[biggsie]

I have a test for you to do, you can do it with a meter or test indicator

Fasten your tester on the ladder or railing and clamp one lead to it

The other lead goes to a wire and in the pool, now to find the problem

You should have some indication of power at the pool

Now you have to turn off breakers one at a time

Until the faulty circuit reveals the source

This is probably a 2 person job one to turn off breakers

And 1 at the pool to let you know when you have the right one

[tkrussell]

No GFI, do not use the pool with any motors or lights running until a GFI is installed.

I believe that either the motor has a ground fault, or something in the home and that does, and that I think the grounding grid in the concrete may not be grounded to the motor, and this is causing you to complete the circuit.

Is there a bare ground wire attached to the outside of the motor on a visible lug? If it is there, perhaps there is a break disconnecting the motor ground lug from the ground grid.

All metal, ladders dive boards, railings, in concrete, needs to be connected together with a #8 solid copper wire back to the motor ground lug.


Using a good digital volt meter should show fault voltage between the motor and the ground grid. This apparently not continuous, so it may the something like the frig or some other appliance that is sending out this voltage.

This is a very possible theory, worth checking.

[dkmason]

Hi All, again I want to thank you for your input regarding the mild shocks in my pool. I think we solved the problem. We had PECO's (electric company) Quality Control Specialist out to investigate and there is a leakage from one of their wires in the street and it is finding its way to our pool. He registered 1.2 volts in the pool. They are coming out next week with an engineer to find faulty wire and may install a new transformer for our home. Hopefully this will be the solution! Thanks for your great advice!! P.s. Just a quick question. OUr pool equipment is hooked into a GFi outlet, do I still need a GFi Breaker?

[KISS]

No. Breaker or outlet, but a breaker catches ground faults from the breaker to the pool equipment. The GFCI receptacle catches a fault from the GFCI to the pool equpment. A GFCI breaker COULD be safer.

[tkrussell]

OK a GFI outlet is fine, I took once you stated "no GFI breaker' as no GFI protection at all. Sorry for the confusion.

[AndresMolina]

We had a similar case in a tub, nothing electrical was close to it light switch was more than 3 feet away and all cables inside piping, inside poored concrete.. Guatemala.. other building methods... but there was no apparent way for the bee stings one getting in and out of the tub... finally we found a wire in the light fixture touching the encasing box, still not surtain how electricity travelled through the concrete having lots of other ground sources in the way like rebar in the columns but, once the wire was fixed the problem ended so check your conections ends a little electrical tape might solve the problem

[Cobraguy]

biggsie, I believe the only time the pump needs to be protected by GFCI is if it uses a plug. If it's hard wired, it does not require GFCI. I know all the pumps here in Phoenix (240V) for IN GROUND pools are not GFCI protected because they are hard wired.

There are so many different ways your pool could be wired we can't begin to tell you where to look. Does your pool use a control panel that serves as a sub? Is it directly wired from the main panel with separate circuits? Is the pool light on a separate circuit and GFCI protected? Is ALL the metal equipment around the pool (panels, pumps, ladders, etc.) bonded together? NOT grounded... but BONDED. There is a big difference. Swimming pools require both. I have to tell you... I'm pretty darn familiar with swimming pool wiring and it scares me to death due to the dangers of making a mistake. You need to call a pool dealer in your area and have them send out the electrician they use for installing their pools. He should know what's going on. Until then, I wouldn't even think of getting near that pool. Maybe I'm being way too paranoid here, but you're playing with lives here.

[tkrussell]

Cobra, correct, 240 volt pump motors do not need GFI protection, but a hard wired 120 motor does. The condition is 120 volts, not if hardwired.

[JEHaynes4]

Has there been a solution to any of the mild shocks listed above that anyone can share? I too am experiencing a difference of potential between the pool water and wet concrete even with the main circuit breaker to the house turned off. I had the local utility out to investigate with no solution thus far. One of the latest visits did show something interesting. The utility turned off the main circuit breaker, still voltage. They removed my electric meter from the meter base, still voltage. I asked them to disconnect the system neutral from my meter base and the voltage in the pool went away! Of course the neutral had to be replaced so I can have electric, but the voltage returned. Does anyone have any ideas? I'm stumped.