nitro71

I would say the only way to bond a existing slab is to chisel out some concrete and hope there is rebar in it. Since you didn't install it and can't test it the inspector would have to waive some rules. Using the hot tub as an example, the inspectors in my area do not require a equipotential grid for self contained/portable tubs.

BuzzKill

I don't think the OP is talking about anything having to do with pools or hot tubs; the sleeve anchor he mentions needs to be bonded somehow to an EGC to clear any ground fault, or dead short.

william1978

I just don't understand why we would be wanting to ground a concrete slab.

william1978

Why are you needing to do this?

Magnettica

The Ufer connection should have been made prior to the concrete pour as required by 250.52 (A)(3).

If the concrete pad is existing don't worry about it.

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leland

I'm still with you William. BONDING- NOT GROUNDING.

That simple.

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leland

Just to get back to the original post

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nolabama

I am talking about bonding a hot tub to the existing concrete pad. I was wondering if one could use the anchor that I put in the original post would suffice. I don't have an 08 code book yet, as we are graded on 05 currently, so I am not up on the changes.

In another post a guy said something about Bonding the hot tub to the concrete pad. This sounds to me like the frame of the hot tub is to be Bonded to the EGC and the concrete slab, not Bonding the concrete slab to the GEC(which would Earth/Ground the slab). I don't know if that is the case or not. If all your doing is bonding the frame to the pad I cant see why that little anchor is any worse than the suggestion that William put forth.

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