Heres the part that drives me nuts. As already mentioned, the POCO rarely upsizes their service entrance conductors. That being said lets take this scenario: Existing 100A service gets changed to a 200A. New meter is installed, new panel, new breakers, yadda yadda yadda. What is unfortunate is that 250.66 (GEC sizing) is driven by the size of service entrance conductors. If the POCO doesn't change their wires, the electrician doesn't have to change the grounding electrode conductors. This would bother me if I paid for a service change...
