Equipotential bonding (concrete deck/coping)

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Old 01-31-19, 07:48 PM
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Equipotential bonding (concrete deck/coping)

Hello All,


Just FYI, we purchased our home last summer and some of the metal parts around our pool had lost their bond (one leg of ladder, diving board). I can only assume the original copper bonding wire (15-20yrs old) broke under the slab. Anyhow, I ran new #8 copper wire and re-bonded all the metal parts of the pool (step railing, ladder, diving board) in addition to all the equipment (pump, swg, etc). I also bonded it with the original copper wire.



Now, I have a question about equipotential bonding in regards to our concrete deck and coping.



1. My original plan was to encircle the entire outside of the swimming pool deck with a single #8 copper wire, which I am utilizing. I was then going to run individual pieces of #8 copper wire down each concrete slab divider and attach it to the pools aluminum coping via stainless screws and nuts. This would at least give me some perimeter bonding within the interior of the pool and areas within the concrete decking. That was the goal because there is no rebar in the concrete for bonding purposes. They only bonded the metal parts and equipment which is probably all that was required 20 yrs ago. I still plan on doing this unless you tell me otherwise.



2. I recently cut several 1ft x 1ft holes into the concrete to add lights and some water features. Anyhow, the earth underneath the concrete decking has settled about 4-5 inches. So I have an opportunity to run a single #8 copper wire around the interior of the pool or 18 to 24in within the pool side which I believe is the recommended bonding method? I could also run some concrete wire mesh but it would only be about 14in wide. I wouldn't be able to reach every point around my pool with the wire mesh but I probably could get about 80%. I think I can get about 95% with the single #8 copper wire.

After I have ran my copper wire and/or mesh, I plan on filling the voids under my decking with a mortar/sand mix to help support the deck. I will use concrete to fill the holes themselves.


Can you offer any suggestions in regards? Will the #8 copper or mesh be fine in the sand under my concrete deck or does it need to be encased within concrete?


Thanks,

Ralph
 
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Old 02-01-19, 12:02 PM
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Good questions Ralph... I wish I could help, but I know close to zero about pool bonding. There are a few around here who do though, stay tuned and I'm sure they'll jump in.
 
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Old 02-01-19, 01:59 PM
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What is the pool construction ?
Vinyl over aluminum frame ?
 
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Old 02-01-19, 09:03 PM
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Hey PJMax,
I have a vinyl liner over a wood frame. The bottom of the pool is a sand/mortar mix of course.

The concrete deck around my pool does not have any rebar within it. They did run #8 copper wire for bonding purposes though. I'm not sure exactly what they would have originally bonded other than all the metal parts and equipment.

Thanks,
Ralph
 
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Old 02-02-19, 06:39 PM
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Ok, so I found a NEC relevant pdf file for me on Mike Holtz as found HERE.

I am a little confused with requirement (5) though. Does this mean the wire must be between 4in-6in below the deck surface? Or does it mean the wire must be within 4in-6in of the deck surface? If the later, I could simply score the concrete surface around my pool, then install my #8 copper wire, and then cover it with grout.

Thanks,
Ralph
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Old 02-05-19, 09:01 AM
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Where I have seen this method used, the bonding conductor is buried in the dirt under the concrete pour. It is much more common these days to put rebar and/or mesh in the concrete and bond that so you might not encounter inspectors who are very familiar with the bonding ring method.
 
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Old 02-05-19, 09:54 AM
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I woujld be looking for some method that does not involve tearing up the deck or excavating under the deck.
 
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