Above Ground Pool Water Bond Devices

[satcom]

Then they changed their minds.

Yes indeed, they changed their mind, hope the utility works just as hard at upgrading their distribution systems to reduce stay, looks like a national grid guy proposed this method.

 

[satcom]

If anyone would like to revisit the stray issues to better understand the reason they search for ways to eliminate the problems stray causes. http://www.mikeholt.com/mojonewsarchive/SV-HTML/HTML/StrayVoltageNotCrazy~20031020.htm

 

[Volta]

Volta, I am too tired to evaluate your response right, yard work is killing me, but I have great respect for your opinion and insight, and I will think this through later. Your idea may have merit that I should consider.

Thank you for your kind words :grin:!

 

[benaround]

You have to make the water the same voltage as the stray voltage or the potential difference

could kill you.

 

[stevenje]

Try this the picture at bottom right - NEW! WaterBond product to comply with 680.26(C)

http://cmiwebsite.com/html/pool___spa_-electrical.html

After looking at the link, I did a quick calculation on the length of # 8 that would be required to meet the 9 square inches in 680.26(C). For all you engineers out there, please check my calculations. I haven't used my slide rule in a few years.

Diameter of # 8 = .049 / 2 =.0245 =Radius of #8

9 sq in = 2 x 3.14 x .245 x H (or length of wire)

9 sq in = .153 in x H

9 sq in/.153 in = H = 58.8 in

From the image in the link, I wonder if the length of the wire is almost 5' long.

 

[benaround]

steve, is that a .0245 or a .245 ?

 

[stevenje]

steve, is that a .0245 or a .245 ?

Frank,
I made the mistake of using the Stranding diameter .049 instead of the Overall Diameter .146. Boy does that change things!

Diameter of # 8 = .146 / 2 =.073 =Radius of #8

9 sq in = 2 x 3.14 x .073 x H (or length of wire)

9 sq in = .458 in x H

9 sq in/.458 in = H = 19.6 in

From the image in the link, I now see that 20 inches is about right. When will I ever learn not to question the engineers!

 

[inspector32513]

Pool WATER Bonding

Pool WATER Bonding

We have that issue with an inground pool. The pool is constructed with a vinyl liner, plastic steps, plastic coping, fighre "4" handrail, and no light.

A bit of research indicates the need to bond the water is to allow the GFCI connected to a device (a radio, for example) that falls into the water to have a path to ground to trip. Even with conductive pool water, the current would flow from hot to neutral, and no path to ground until the person holding the hand rail stepped into the pool.

This might also help to eliminate some possible 'stray capacitive voltage' on the conductive water, separated from the conductive earth by an insulating vinyl liner. I have seen voltages reduced or eliminated by dropping a piece of bare #12 connected to the grid into the water.

Lynn Adams
Chief Electrical Inspector
Escambia County Florida

 

[Dougie G]

Is the water bond to be a minimum of 9 square inches or 9 inches square?
Nine square inches using a piece of metal in the skimmer would only be 3x3 inches, whereas nine inches square would be a total of 81 square inches.

 

[brantmacga]

i have nothing to do with aboveground pools, but i've used the bondsafe 680 and it works great.

 

[HEYDOG]

Here is a link to a study that i believe swayed the code making panels decision on bonding the pool water. http://www.ece.gatech.edu/research/NEETRAC/publications/Jodie_Lane_2007.pdf

 

[dbuckley]

Is the water bond to be a minimum of 9 square inches or 9 inches square?

The metric size quoted is about 5806 sq mm, which is about 9 square inches, ie 3x3 inches.

Trying the same multiply it out function with the metric unit, 5.8 meters squared is a bit over 33 sq metres, which is significantly bigger than 81 sq inches

So it's gotta be square inches, not inches squared.

 

[Volta]

Here is a link to a study that i believe swayed the code making panels decision on bonding the pool water. http://www.ece.gatech.edu/research/NEETRAC/publications/Jodie_Lane_2007.pdf

Hey- cool study, thanks!