Is anyone aware of a jurisdiction where it is NOT common practice to use an underground metal water piping system (where present) as part of the grounding electrode system for a residence and rely soley on a driven rod? Likewise, any jurisdictions where the grounding electrode system is NOT bonded to the interior metal water piping system (where present)? If so...WHY?
The 2002 code makes it clear that the cold water should be at a minimum be bonded and if 10' of metal in the ground shall be used as a grounding electrode.
250.50 requires that if available each item in 250.52(A)(1)-(6) shall be bonded together. Metal underground pipe is item 250.52(A)(1).
250.104 (A) requires bonding of metal water piping.
So any jurisdiction not using the cold water is violating the NEC. The workbook notes in 250.52(A)(1) that there has always been uncertainty about using the cold water, but that NIST has monitored the issue and found minimal problems.
Yes I know you know, I was just stating what the people would be violating if they didnt bond the metal water. Its very clear from the NEC to do so, so I don't think anywhere would say you shouldnt. Everywhere in SoCal you have to bond the cold water.
250.50 Grounding Electrode System. If available on the premises at each building or structure served, each item in 250.52(A)(1) through (A)(6) shall be bonded together to form the grounding electrode system. Where none of these electrodes are available, one or more of the electrodes specified in 250.52(A)(4) through (A)(7) shall be installed and used.
As far as the NEC is concerned if a metal water pipe exists on the premises that fits the criteria of 250.52(A)(1) it must be used.
These areas that do not use it are either ignoring or amending the NEC.
Bob Badger Construction & Maintenance Electrician Massachusetts