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Bud--

wrote:
On Sat, 25 Sep 2010 19:41:38 -0500, bud--
wrote:

HeyBub wrote:
bud-- wrote:
The NEC Handbook says "The requirement to supplement the metal water
pipe is based on the practice of using plastic pipe for replacement
when the original metal water pipe fails."
Water pipe is a good electrode. The problem is it may be replaced by
plastic in the future.

Contrary to what seems to be a common internet opinion, water pipe
(metal, 10 ft...) is *REQUIRED* to be a grounding electrode. Read the
NEC (relevant quotes provided).
My house, built in the '60s, has galvanized iron pipe throughout. It's built
on a slab with all pipes in the walls and the attic.

Eventually, the iron pipe exits the wall to connect to the city water
system. As the pipe leaves the house, it encounters a valve, then, on the
other side of the valve, plastic to the city.

There is no connection between any of my water pipes and the earth -- unless
you count the conductivity of the water itself.

I have consistently limited comments to "metal, 10ft..." which obviously
does not apply to your house.

On the other hand what you wrote: "the purpose of attaching the
electrical ground to a water pipe is not to ground the electrical
system, it's to ground the plumbing system" is not true in general. And
you reinforced Salty, who appears to not want metal water service pipes
to be used for system earthing.

What? You HAVE become westom.

Perhaps you could post something relevant to what is being discussed,
like is a metal water service pipe required to be an earthing electrode?

--
bud--