Pool bond question. Potential difference

E

electricblue

Senior Member
Location
Largo, Florida
Occupation
EC
Looking at a concrete pool that had a spa added. Pool builder says he chipped into existing pool shell to rebar in 4 spots to reach rebar and rebond then ran a ring around the pool and spa. There is a tingling when touching the pool water and spa water. .668 volts from spa to pool water. I say the old pool is not bonded and at a different potential from the new spa and fire bowls that all have continuity back to the pump. I just want to run this by someone here to double check myself before I have him start pulling up deck and looking into the bond.
 
How did you measure the voltage, and could it have been a DC measurement?

Is the voltage present with power off?

Are there different equipment terminals ( eg. pool and spa pumps) where you can take a resistance measurement?
 
I think you should wait for input from the more pool focused members ( @Mystic Pools comes to mind).

But I think you are correct about something not being bonded. It sounds like the contractor that did the spa did quite a bit of bonding, but clearly some bonding isn't present. Maybe the pool shell wasn't connected to the pool deck or some such.

-Jonathan
'
 
I thought the original poster said the builder tied into the rebar at 4 points on the existing pool. Is this not correct?
 
electricblue said:
I say the old pool is not bonded
Click to expand...
may have been some bonding attempt but apparently not done very well or there been some failures. Bonding to four different points should possibly lessened chances of having potential so makes you wonder what didn't get bonded that should have. Or if portions of concrete had been replaced at some point how well things got tied back together.
 
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