After a number of recent lightning hits taking out DSL equipment, I want to supplement this ground with several ground rods physically near the AC entrance and Telco Demarc. (Luckily the Telco Demarc is at the AC service entrance...). One way to do this seems to be adding a new conductor from new ground rods that goes to the ground in the entrance panel, is this correct? My reading of the NEC leaves me with the conclusion that it is not allowed to cut the existing #4 running to the cold water pipe. I'm wondering if a Cadweld to the "old" #4 wire underground may be allowed or even superior. Are cadwelds forbidden in some jurisdictions for residential grounds? My local electrical inspector didn't even know what I was asking about.
Is it part of NEC code that the hot water pipes be electrically bonded to the cold water pipes too, or just common sense? My look through the book didn't turn up a relevant section.