Swimming pool-bonding

[kbsparky]

We had a job where there was substantial stray voltage present in the yard around a pool.

We had bonded the pool ladders, railings, pump, heater, etc as required. But the pool itself was fiberglass, and had no other metal coping, or rebar associated with it.

The problem was the yard was "hot" and the fence next to the propane tank had a significant potential difference due to the bonding grid. We had to install a jumper from the tank to the fence to avoid getting shocked when you walked between the two.

Then, when you got to the gate in the fence, there was a voltage between them. Every time we bonded something else, the voltage difference would move on to the next thing in the yard. It seemed like a never ending battle.

 

[sparkyjpb]

Inspector is again making us bond the metal weather proof switch boxes at the equipment as well! Do I have a fight?

 

[stickboy1375]

Inspector is again making us bond the metal weather proof switch boxes at the equipment as well! Do I have a fight?

Why would you bond that? They have to be 5' away from the pool anyhow.

 

[sparkyjpb]

It is 5'from the water, but he says any metal even within 5' of the equipment must be bonded.

 

[stickboy1375]

It is 5'from the water, but he says any metal even within 5' of the equipment must be bonded.

:grin: Have fun with that....

 

[M. D.]

I can't help but to wonder ,...If Mike Holts graphic never showed the window frame ,..door frame ,..fence and antenna bonded to the grid ,.... would we be having this discussion. He has removed the bonding of window and the door frame from his graphic apparently it was "stupid" to show them bonded.
The section most used to compel people to bond "All metal parts within 5' is 680.26(b) (7) and not (B)(5) notice in (5) there is relief for small isolated parts , even though they maybe in the pool itself,....not so in (B) (7) ,..you "All metal parts " folks have me bonding nails , plant hangers latches on plastic fences and whole bunch of other "All metal parts within 5' .
I'll admit for a pool this might not seem like a lot to ask ,..but for a hot tub plunked down right next to a house it will be a very tedious task to bond "all metal parts within 5' " of the tub

from this thread http://forums.mikeholt.com/showthread.php?t=99765

Quote:
Originally Posted by radiopet
MD.....I was really trying to not bring in why i believe what i do because some dont like when i speak of the IRC or IBC in the NEC FORUM...
As for Mikes intent i can only say he stated it was "stupid" to show the bonding to the metal window and door trim but believes the fence and antenna bonding is clear.....


I don't see the language in the 2008 that gives Mike such clear vision on the fence or antenna ,..in fact it seems quite the opposite

You could send me a P.M. with whatever back up you have ,..if not that's O.K. too .

 

[M. D.]

We had a job where there was substantial stray voltage present in the yard around a pool.

We had bonded the pool ladders, railings, pump, heater, etc as required. But the pool itself was fiberglass, and had no other metal coping, or rebar associated with it.

The problem was the yard was "hot" and the fence next to the propane tank had a significant potential difference due to the bonding grid. We had to install a jumper from the tank to the fence to avoid getting shocked when you walked between the two.

Then, when you got to the gate in the fence, there was a voltage between them. Every time we bonded something else, the voltage difference would move on to the next thing in the yard. It seemed like a never ending battle.

the problem with equipotential bonding grids is,.. at some point you "step" from it.,.. something to think about..