In the very least an attempt was made... Although I don't see the point. They followed the letter of the code IMO, but not the way I would do it. 1/2" hub direct to the steel, RMC and a 1/2" hub/clamp to the re-bar. (Thats if it is even part of the electrode system?) Even then I would have done it nearer to, and direct to the service.
Surfinsparky, an insulated conductor as a GEC would still need to have the conduit bonded at both ends.
cptkinguru, an acorn is a listed clamp. (Although maybe not for that size wire)
