rebar clamps needed?

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jjhoward

jjhoward

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Location
Northern NJ
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Owner TJ Electric
Working a fiber inground pool. Concrete walkway all around the pool with rebar. Pool has low voltage LED lighting, no metal handrails or ladders. Do I need rebar clamps to my #8 that will be placed around the pool or can I just use tie wire to just keep that #8 in place when the concrete is poured? The #8 will be connected to the ground lug on the filter pump and the water bonding fitting at the water lines.
Thank you.
 
As far as I know, only the rebar is allowed to be tied together with tie wires. I'm pretty sure if there is rebar around the pool, it should be made into grids. That is the main way the equipotential bond is to be made. The #8 is an alternate method when there is no rebar or grid. Even if the #8 is allowed to be the method used, you would need to use a clamp suitable for direct bury to attach it.
 
Check 680.26
If you have steel rebar tied together per 680.26(B)(1)(a) then all you need to ensure is the bonding of all parts to that rebar grid with copper wire and to motor as well as any other parts requiring bonding per 680. The perimeter grid of tied rebar is a whole component requiring bonding and can be the perimeter grid, and only requires the copper to connect everything together, with no need to have the copper encircling pool as in the alternative method found in 680.26(B)(2)(b)(1-4).
And no tieing the bonding copper to the rebar with tie wire does not create a bond, required connection of bonded parts per 680.26(B) all bonding to be made in accordance with 250.8, which does not include tie wire as a means of connection, and must be listed for direct bury, concrete encasement, and corrosive environment. Not every connector being sold out there is meeting that listing.
 
OK so I don't need to purchase 160' of 8 awg copper!! But I will bond the rebar to the 8 awg with listed rebar clamp(s) near the pool equipment. The 8 awg copper will simply be on the ground lug of the filter pump and the fitting in the plumbing with 9 sq in of metal for water bonding & then bond the rebar to the 8 awg CU with a listed clamp. The metal ties are sufficient to make the rebar continuous, but I guess the concrete is also conductive. Conductive enough to prevent any stray voltage potential. Yes? I haven't seen the rebar install yet, but it is often coated with something.
 
And I will check for Neutral to earth voltage (NEV) levels around the pool to confirm the bonding is in place.
 
jjhoward said:
Yes? I haven't seen the rebar install yet, but it is often coated with something.
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If its coated it's same issue as a CEE that is coated, and not usable for the EPB. 680.26(B)(1)(A) "where structural steel is encapsulated in a nonconductive compound, a copper conductor grid shall be installed......." . Even paint is considered nonconductive.
 
Update for the pool bonding grid: The rebar was not coated, however it was 3 parallel runs of rebar following the contour of the pool. Most of the rebar was not 18" from the side of the pool. We decided to put in the 8 awg CU all around (18'-24" from the side of the poo). Bonded the rebar to the 8 CU at 4 points and landed the 8 CU on the pump, heater and water bond fitting in the plumbing. There will be 4" of concrete on top of the 8 Cu and the rebar. We should be OK. Will do a sanity check with NEV measurements.
 
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