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#199730 03/06/11 12:38 PM
Joined: Jan 2004
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While looking at Article 680.42 I have come to the realization that there is no exemption from a perimeter surface grid for spas and hot tubs. 2008 NEC. I have not been asking for this as part of the bonding. What am I missing?


George Little
2017 / 2014 NEC & Related Books and Study Guides
Joined: Jul 2004
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Why would there be an exception? You have exactly the same risks. It may actually be more risky since they use an immersion heater in most spas.


Greg Fretwell
Joined: Jan 2004
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Thanks Greg, I was expecting to see an exception for a spa or hot tub on a wooden deck. If the concern is the voltage gradients in the earth and the deck separates the spa from the earth- what's the hazard? Maybe the wood when wet could be an issue???

The other thing that don't make sense is the fact that we don't need a perimeter surface grid for a storable pool and it typically is setting right on the ground allowing a person to be outside the pool standing on the ground and have their hands in the pool water???


George Little
Joined: Jan 2005
Posts: 5,316
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Immersion heat more risky? Better tell that to my water heater.

In our quest for 'safety,' are we chasing faeries and pixies?

Joined: Jul 2004
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George, I see where you are going. If this is a non conductive decking surface, I agree I am not sure how you bond it. I usually hear about the issue being a packaged spa dropped on a concrete or other type of paved deck.
I understood expanding this to the grass but I think they missed something.
Does the 2011 address non conductive decking?
I know that was the usual mitigation, adding a 3' deck around the spa.

Reno I would not be "shocked" if we did see something about bonding the water in homes with electric water heaters and plastic pipe. Most new water heaters do come with steel stub ups that would give you at least 9 sq/on of surface and it is bonded to the EGC but I doubt that would trip a 30a breaker.
I know that copper piping will, because my neighbor had an element open up to the water and it was like a bolted fault.
You could hear water boil for about a second and the breaker tripped.


Greg Fretwell
Joined: Jul 2004
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Storable pools are a totally different breed of cat. All storable pool equipment is required to be double insulated.


Greg Fretwell
Joined: Jan 2005
Posts: 5,316
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WHat's next? Equi-grids for the kitchen disposal, dishwasher, and whirlpool tub in the bath? Heck, let's do the whole yard, in case someone later installs a birdbath.

Heaven forbid someone decide to shift the package unit over to the other side of the patio, or set it up in the garage in the winter. After all, they get filled with a garden hose, and can go anywhere.

I'll tell you where this will all lead. It will lead to a world where Billy-bob 'hillbilly engineers' some bit of kludge that is truly dangerous, everyone makes an occupation out of avoiding city hall at all costs, and every street will have some bitter harridan peering through fence slats hoping to cause trouble for the neighbors.

Joined: Jul 2007
Posts: 265
W
Member
In about three or four code cycles it will be against the code to put electricity in a house at all!!! Everytime somebody invents a new widget, a new code chapter gets written to require its use, needed or not. Arc Fault, Ground Fault, Tamper Resistant, and in use devices have more than doubled the cost of wiring a house with no end in sight. The end result will be some really dangerous stuff thrown together to avoid calling an electrician at any cost.


Jimmy

Life is tough, Life is tougher when you are stupid
Joined: Feb 2002
Posts: 2,233
H
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Look who sits on the code making panels, what do you think there job is? Granted now some of the new products are great and they are real time savers. However just because someone invents something new, shouldn't mean that the code has to be changed and that the new product is required to be installed. Just my opinion. smile

Joined: Mar 2011
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