sorry about that, i'm a bit of a groundaholic off on a 2002 bender here. (is there a support group out there?)
anyhow, as Redsy said, it's complex and the theory is not explained in the NEC, nor is it the documents job to do so ( diclaimers for placing hot coffee on top of the code book will be next)
Perhaps it's best if you ask yourself what the job classifications for GEC, EGC, & Bonding are ( it's burned up much cyberspace)
as applied in the field vs. code intent.
In your first post you have a 200A drop, residential 4/0 al. seu ( flat cable), then two feeders ( #3) from the meter to two 100A panels? Is this correct?
Does the meter have 2-100 amp breakers here? Or are both panels directly below the meter?
In either case, I would bond GEC to the meter's larger conductors and drain any large spikes there.
the 'parrallel' GEC vs. noodle thing is absolutly an all-time flamer! It's good to get some insight from other systems like Paul has done, he's to this forum what the Beatles were to pop!
[This message has been edited by sparky (edited 10-27-2001).]