Amongst other electrical work, I have been replacing/upgrading residential services for about five years. There have been situations when it is very difficult and would cause significant damage to the customers house if I were to upgrade the water pipe bonding conductor from a #6 to a #4, these sizes were picked for simplicity. My boss has told me that it is okay to substitute upgrading the water pipe bond with a second ground rod. In other words a 200 Amp service will have two 1/C #6 bare copper connected to two separate ground rods and a #4 aluminum bonding the water service; all of them being terminated at the main panel's neutral/grounding bar.
Is this acceptable as per the NEC and are there ever local/utility regulations regarding this? If there are local/utility regulations which takes precedence the NEC or the local?
Thank you in advance.
Is this acceptable as per the NEC and are there ever local/utility regulations regarding this? If there are local/utility regulations which takes precedence the NEC or the local?
Thank you in advance.