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Connecting to Building Steel (rebar) Before Concrete Slab Is Poured

If that exposed rebar is in a location that "is not subject to corrosion", then connecting to the CEE that way is allowed under 2020 NEC 250.68(C)(3). So as long as that's true, and that acorn clamp is installed in accordance with its installation instructions, I don't see any violations. The GEC doesn't even have to be green, it could be black.

Cheers, Wayne
 
wwhitney said:
If that exposed rebar is in a location that "is not subject to corrosion", then connecting to the CEE that way is allowed under 2020 NEC 250.68(C)(3). So as long as that's true, and that acorn clamp is installed in accordance with its installation instructions, I don't see any violations. The GEC doesn't even have to be green, it could be black.

Cheers, Wayne
Click to expand...
Unknown variable. Is the acorn clamp listed for concrete encasement?

What about the fact the acorn clamp is placed over the top of paint?
 
I don't think that's compliant, unknown variables like you say. But pretty easy to fix. Clear out some of that rock, form up a little square, maybe 12" x 16", and pour concrete. Make sure it's fully encased with a minimum of 2" of concrete on all sides. Assuming that rebar complies with 250.52(A)(3).
 
jar546 said:
Unknown variable. Is the acorn clamp listed for concrete encasement?
Click to expand...
That one is easy, UL 467 says that if marked "DB", it is listed for direct burial and concrete encasement. So all you have to do is look at the clamp.

Seems to me any ground rod clamp (acorn clamp) would be so marked. Otherwise it would be a clamp that could only be used on 10' ground rods that aren't fully installed in the earth. The NEC requires any ground rod to have 8' in contact with the earth, so any 8' ground rod must be entirely buried, meaning it will need a DB ground rod clamp.

jar546 said:
What about the fact the acorn clamp is placed over the top of paint?
Click to expand...
That definitely requires a closer look, and if there's paint under the clamp, it needs removing.

Cheers, Wayne
 
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