You can't splice the GEC but you can splice a GEC "tap. Clear as mud huh?
That is why I said the easiest way is to loop one #4 or #2 through the pipe clamp and then you will not get a fight ... unless they actually want to size it to the SE conductors per 250.66
The GEC is limited to the rating of the electrode. A rod is #6, A Ufer #4 and a water pipe, the full size called for in 250.66
