It seems the IRC is simular to the former interpetations of the NEC, in 406.3 D(1), you are reffered to 250.130(C), and you would find....
(1) Any accessible point on the grounding electrode system as described in 250.50
Which was fine untill the code changed in '93 to no more than 5' from entrance of building.....
And this interpetation resulted...
"Because of the requirements of 250.52(A)(1), an interior metal water pipe more than 5 ft from the point of entrance of the water pipe into the building is no longer allowed to serve as a connection to the grounding electrode conductor."
So back in the day it was easy, just ground to any portion of the cold water... DONE!
But what does it say in these sections?
"as allowed and described in Chapters 33 through 42."
The two codes may revert to apple / apple again.
