Ground clamp for 1" copper water line

[hbiss]

Is it me or why is it nobody makes a ground clamp for 1" copper which is 1-1/8" OD? The 1/2 to 3/4" clamp is too small. Next up is the 1-1/4 to 2" which is too big. But if I take that 1-1/4 to 2" clamp apart and flip the back it works but I'm wondering if that is code compliant.

-Hal

 

[curt swartz]

What ground clamp are you using? The standard ground clamps from all the manufactures I have ever used are designed for up to 1" galvanized pipe so will easily fit 1" copper. I have never seen a clamp that only goes to 3/4".

 

[ActionDave]

But if I take that 1-1/4 to 2" clamp apart and flip the back it works but I'm wondering if that is code compliant.

I've never asked, just used it that way when I needed to.

 

[don_resqcapt19]

The expensive Burndy "GAR" series has one for 1" copper tubing.

 

[hbiss]

1" galvanized pipe

The OD of 1" galvanized pipe is (unbelievably) 1". The OD of 1" copper is 1-1/8". There's the problem.

-Hal

 

[suemarkp]

OD of a 1" galvanized pipe should be around 1.25". A 3/4" galv pipe should be about 1" OD. Same as rigid conduit.

 

[hbiss]

I've never asked, just used it that way when I needed to.

Yeah, me too but I'm just wondering. Had a 1" water service today.

-Hal

 

[suemarkp]

The clamp should be marked with the sizes it takes in numbers as in this photo.

 

[hbiss]

OD of a 1" galvanized pipe should be around 1.25". A 3/4" galv pipe should be about 1" OD. Same as rigid conduit.

Now I see 1.315 from a different chart, that's why I said I didn't believe only 1". Probably the ID.

But looking at the 1/2 to 1" clamps I have (from a supply house) they are all the same, almost make 1.125" but too small. No way will they fit around 1.315". Ran to Lowes and got the larger one and looked at the 1/2 to 1" they had. Looked the same as what I had.

-Hal

 

[suemarkp]

I wonder if the size marked is for copper pipe. Copper pipe is smaller than galvanized pipe for a given trade size. It is and more like EMT trade size which is also a tube and not a pipe.

 

[hbiss]

The clamp should be marked with the sizes it takes in numbers as in this photo.

Yes. But whatever it was I used on the other side of the water meter which was 3/4" so I can't tell you what it was. Last one I had too. Wonder if it was a 1/2-3/4" and I didn't look.

-Hal

 

[hbiss]

I wonder if the size marked is for copper pipe. Copper pipe is smaller than galvanized pipe for a given trade size. It is and more like EMT trade size which is also a tube and not a pipe.

Maybe it was metric.

-Hal

 

[MTW]

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[LarryFine]

Why is the OD always larger than the ID?

 

[hbiss]

Wall thickness.

-Hal

 

[zbang]

flip the back it works but I'm wondering if that is code compliant

I've always understood they were designed for that, the big lump on one side of the threaded part pushes the pipe into the part with the wire (ref the photo above).

 

[ptonsparky]

I've always understood they were designed for that, the big lump on one side of the threaded part pushes the pipe into the part with the wire (ref the photo above).

Yes.

 

[readydave8]

Why is the OD always larger than the ID?

Safety!