Can either of these clamps be used with a copper ground rod?
There will be a label on it that will tell you where they can be used…
Acorn for Grounding
2-screw for Bonding
Both types can be used to attach a copper conductor to a ground rod. As Roy stated they should be labeled.
I don’t think I have ever seen a label that is readable on them. Just so I am clear, The ground wire coming from the panel to the ground rod should be under an acorn type of clamp?
An acorn is more common, but both can be used if labeled.