" writes:
On Monday, October 28, 2013 9:18:34 AM UTC-4, philo=A0 wrote:

=20
He did not say /ungrounded/ he said grounded to water line
=20


Again, it's perfectly normal to see CATV, phone grounded to
a cold water line. There is nothing wrong with it, it doesn't
have to be changed and it has nothing to do with the OP's problem.

And again, it's perfectly normal to see the electrical panel
grounded to the cold water line. It's not a code violation.
Good grief.

Section 250.104 of the NEC requires that metal water piping systems
be bonded to one of the following:

* Service Equipment enclosure (at service entrance)
* Grounded neutral service conductor (at service entrance)
* Grounding electrode conductor when sized per table 250.66
* One of the electrodes of the grounding electrode system.

The grounding conductor must be sized appropriately with respect
to the largest ungrounded service conductor (e.g. AWG2 for 4/0 service entrance).

This is for safety purposes, not to provide a grounding conductor for the
premises.

This _DOES NOT IMPLY THAT SUCH A BONDING CONDUCTOR MAY REPLACE A CODE COMPLIANT
GROUNDING ELECTRODE SYSTEM_.

In other words, the water pipe is bonded _to_ the real grounding means. The water pipe
may not _be_ the premises grounding means (as of the 1999 code, or possibly earlier).

I suspect this is the root of your disagreement.

FWIW, bonding CATV to a cold water line isn't done by most cable systems anymore,
as they have no assurance that the cold water line is actually bonded to the
premises grounding electrodes, particularly in regions of the country where
the water service lines were non-metallic or have been replaced by non-metallic
piping (per the local Comcast tech staff).

scott