ECN Forum Forums Code Related Discussion NEC & other Code issues 680.26 Bonding Grid

gfretwell...

For the perpendicular intersecting #8 bonding wires of the equipotential grid pattern, I will use split bolt connectors...unless someone knows of a new product for this application?

I'm still in the design stage of rewiring this exsisting inground poured concrete swimming pool.

The deck surrounding the pool will be precast brick pavers set in stone dust... so the bonding grid under the deck would have to be placed under the layer of stone dust...

As for a grid under a fiberglass pool structure, here is the latest from the NFPA...

Go to: www.nfpa.org/itemDetail.asp?categoryID=136&itemID=19181 and click on "May 2005" from the list...

shortcircuit

George,

The Bonding Lugs I saw that looked AL, I believe were a type of metal that was "Tinned" to be UL acceptable for attaching to AL and they were suitable for direct burial. I will try to get more info on these lugs for you if interested. They are something brand new I guess, cause I never seen them before. I believe they were from Greeves.

Copper.org gave me 2 links to copper grid systems.
Erico (the Caddy Clip guys) makes a copper clad steel grid http://www.erico.com/products/GroundGrids.asp

Harger Lightning Protection makes a U/L listed #6cu grid http://www.harger.com/catalog2004/1_4_8.pdf

I don't know if either either of these is cheaper than a field built #8.
If the demand is there these would be the logical folks to cobble up #8 grids tho.

I don't think that is a listed use of split bolts.
Don

Split bolt is a regular way to join 680.26 conductors. As long as it is listed for direct burial and copper I don't see an issue. It would be pretty expensive to do one on every corner of a 12" grid tho.
The Erico folks say they make it prewelded and ready to go. I looked at the catalog and didn't see a 3' wide mat. They seem to be 4'
If you are really buying some I imagine the salesman would be happy to talk to you.

gfretwell...thanks so much for the supplier leads!

I put a call into HARGER and they gave me a part# for a mesh with #8 solid with welded joints 100ft long by 3ft wide...GM3100812

Coarse they won't sell directly, so I'll check with my supplier tomorrow for pricing.

I told him there is a demand for a suitable product in the pool industry.

shortcircuit

Actually I got those tips from copper.org but I was glad to help find an answer to this problem.

resqcapt19.."Burndy Servit" split-bolt type KS-DB is UL approved for direct bury in earth or concrete...

shortcircuit

I ordered pre-fabricated grounding mesh from HARGER today. It is going to be 2 feet wide and 160 feet long, #8 solid copper welded at intersecting points with 12inch cells.

This will cost $620 for the mesh and $120 shipping and will take 7 to 10 days to get to me.

I was also successful busting into the concrete from the backside of the wall and exposed 1" rebar at two points for bonding the pool shell.

So, the 2005 code has added a couple grand to the electrical bonding for this pool

shortcircuit