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2011: Pool Grounding Grid #187649
07/05/09 06:26 PM
07/05/09 06:26 PM
renosteinke  Offline OP
Cat Servant
Member
Joined: Jan 2005
Posts: 5,316
Blue Collar Country
I see there are numerous proposals to change the requirements for the equipotential grid around pools. I daresay that few sections of the NEC have undergone a more furious amount of revision than 680.26 has in the last few cycles.

Some of the proposals seek to remove the requirement; others try to make it more specific. There is one proposal (17-172) which, while it addresses the shell rather than the deck surfaces, causes me some concern; IMO, it's one of those things that will take on a life of it's own, and greatly increase pool costs.

Also, IMO, none of these proposals address inaccessible surfaces.

My own research into this topic points to this entire issue arising solely from the advent of ONE type of pool - the shipped complete by truck, blow molded plastic pool shell. Another possible contender is the plastic encapsulated metal pool shell. In either instance, the real culprit seems to be the inadvertant insualting of the pool water from the surrounding grade. It appears to me that this is an issue better addressed by identifying those particular methods, rather than trying for a 'one size fits all' approach.

2017 / 2014 NEC & Related Books and Study Guides
Re: 2011: Pool Grounding Grid [Re: renosteinke] #187651
07/06/09 01:26 AM
07/06/09 01:26 AM
G
gfretwell  Offline

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Joined: Jul 2004
Posts: 9,182
Estero,Fl,usa
There is already a provision to bond the water in the 2005/2008.

Quote
680.26(C) Pool Water. An intentional bond of a minimum conductive surface area of 5806 mm2 (9 in.2) shall be installed in contact with the pool water. This bond shall be permitted to consist of parts that are required to be bonded in 680.26(B).


Greg Fretwell

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