That is a good observation one I also noticed but he is correct.
He has a 800 amp service consisting of two 400 amp panels.
The GEC tap from each panel to the grounding bus is based on only the service conductors feeding the panel it comes from.
Now the bonding jumper from the grounding bus to the water main has to be sized on the total service conductor size.
This is covered by 250.64(D)
Considering the conductors from the panel to the grounding bus are called GEC Taps and the conductors from the grounding bus to the electrodes are called bonding jumpers, the only GEC in his installation may be the grounding bus itself.
Bob
[This message has been edited by iwire (edited 02-15-2005).]
