pool stray voltage

[edwardsville]

9-acre site in country, last house on poleline.

Site arrangement:

Transformer pole SE corner of house.

Coypond on E side of house.

House service middle of house on N side.

Garage20 ft NE of house.

Pool deck between back and E side of houseand W side of garage.

Pool pump panel on NW back of garage.

Pump panel feeder from house service point toSE of pool, 5ft from pool.

Pool is 15ft North of house and 10 ft W ofgarage.

Pond is 100ft N of garage.

Garage service from house service point to Wside of garage, 5 ft from pool.

Utility Service feeder is 7 ft south of pool.



In ground pool, E P Grid installed 9 sq"luminaire in contact with water, wet niche tied to EPG.

Problem:

Receiving voltage difference of 1 to 4 voltsbetween pool water and deck, only on garage and house side of pool. In coyfishpond 22 volt difference. Voltage changes with load energized. No voltagewithout load.

We have removed all branch conductors andadded a load bank at different points. No matter where the load is added to thehouse, garage or pump panel. As soon as a load is added voltages reoccur.

We have run a new OH service to the House. Voltageis still present.

Removing the feeder EGC at the pump panel novoltage. Against code.

Utility want to add Neutral blocker.



Anysuggestion on where to look.

 

[Hv&Lv]

I wonder if the utility checked the connections at the transformer? It sounds like a high resistance connection in the neutral. Maybe the neutral connections between the pump and the main since the voltage stops when you disconnected it there? When the ground for the pump was disconnected, what was the voltage between the motor case and the earth? Take a long screwdriver and stick in in the ground about 10 feet away from the pump and check the voltage from the case and the screwdriver.
We atually had a condition like this where the neutral wasnt connected to the center tap on the transformer. The pool was giving a 36 volt shock, made for some miserable swimming. The neutral was connected to the mainline neutral, and the center tap had #6 copper to the mainline. It was loose.

 

[edwardsville]

replace service feeder

replace service feeder

The Utility replaced the UG feeder with a temporary OH feeder. This should have taken care of the neutral connection problem. Thanks for the lead.

 

[wirenut1980]

If there is only voltage present when load is on at the house, then a neutral blocker will not do anything for you. All that will do is prevent primary neutral voltage drop from showing up on the EGC.

Between what 2 points are you measuring 22 V at the coyfish pond?

Does voltage slowly increase as more load is applied?

On second thought, there could be a bad connection in the primary neutral between your transformer and the next house upstream, so maybe trying the neutral blocker is something to try.

How is the equipotential grid installed for the deck?

 

[brian john]

Am I the only one that finds it next to impossible to read his post as formatted?

 

[brian john]

1. What type of meter are you utilizing?
2. Is anyone getting shocked or feeling a tingle?
3. Have you checked all the neutrals to verify they are free of shorts to ground?
4. Have you check all possible 240 VAC heaters to verify one side of the element did not go to ground?
5. Have you performed zero sequence readings at the panel?
6. Zero sequence on the branch circuits?
6. Well or city water?
7. With everything operational is there current on any ground conductors, metallic water piping, GEC’s or any other metallic components?
8. Have you tried to isolate one load at a time including the main service then meter?

What’s the deal with the load bank please elaborate.

 

[George Stolz]

Voltage changes with load energized. No voltagewithout load.

We have removed all branch conductors andadded a load bank at different points. No matter where the load is added to thehouse, garage or pump panel. As soon as a load is added voltages reoccur.

(snip)

Removing the feeder EGC at the pump panel novoltage. Against code.

Utility want to add Neutral blocker.



Anysuggestion on where to look.

Removing the EGC removes the voltage? You're on top of it. The problem is on site, downstream of that feeder. Megger anything down that way and you'll find it.

Thanks for the detailed description!!! :thumbsup:

 

[LWFLASH]

Net Current for Sick ELectrical

Net Current for Sick ELectrical

Just a suggestion to start looking for Net Current flow on the Ground from your Home. We find this kind of stuff in "Sick Buildings". Sometimes you can pick up Net Currents from other surrounding electrical installations down line or up line from your location that are not filtered or properly grounded and the current of small voltages returns down the Grounded. There is a book written by a Man Boulder Colorado that is listed on this web site that Deals with "Silencing the Fields" I thing this is what it is called. Try reading this it has opened up alot of new areas of trouble shooting tec for myself and my Son.
LWFLASH
Denver, CO

 

[edwardsville]

Pole Line Upstream

Pole Line Upstream

The Utility found the problem on their line. Even though they claimed it was on the house side. One pole up stream of the Transformer pole they found a back neutral connection. repaired the connection problem went away.

Thank for all the ideas.