I assumed the "central point" Jim was referring to, was a central point for
the plumbing. For the electrical side, this is a no brainer, it has to be
the entrance panel.
I have observed in my neighborhood, that the plumbing is usually bonded to
ground just after the water meter. That seems like a "central point" to me.
The bonding wire can be very long if the electrical service panel is on a
different side of the house than the water main.
My county's codes also requires that there be some kind of jumper for
ground outside the water heater between the cold in pipe and hot out pipe.
I don't know if this is a safety requirement or they are trying to divert
electrolysis to prolong life of the water heater.
I think other counties have a requirement that there be a similar jumper
around the water meter or around the shutoff valves near the water meter.
The folklore I've heard with that, is that this was needed when the
electrical code was OK with using cold water pipe as an electrical ground.
Tim.
On Fri, Oct 30, 2015 at 2:03 PM, Dan Edward Dba East edwards <
dan.n.edwards@sbcglobal.net> wrote:
> 'central point' being my main service breaker box?
> it's a good distance away from any plumbing...
>
>
>
> On Friday, October 30, 2015 12:28 PM, Jim Brown <
> jim@audiosystemsgroup.com> wrote:
>
>
> No, that should be done at a central point in each premises, and only
> when the plumbing is metallic and conductive to the earth.
>
> 73, Jim
>
> On Fri,10/30/2015 9:58 AM, Dan Edward Dba East edwards wrote:
> > ok...another thing i've wondered about...
> > every bathroom and utility sink plus the kitchen have 120 vac outlet
> quite nearby..
> > should i tie the green a.c. wire to the plumbing at each?
> > w5xz
> >
> >
> >
> >
> > On Thursday, October 29, 2015 5:36 PM, Guy Olinger K2AV <
> k2av.guy@gmail.com> wrote:
> >
> >
> > It would really be something if in-the-slab copper was floating
> > electrically. I have seen the copper connected with a heavy wire out of
> the
> > slab connected to the ground bus in the main electrical panel. The other
> > end of the wire came up out of the slab next to the bonding point with
> the
> > copper pipe in a weather protected spot.
> >
> > If there is a question you should get a local licensed electrician who
> can
> > check it according to NEC + local practices. Local practices may specify
> > where and how the pipe is connected to the power ground.
> >
> > You might want to check if an ohmmeter shows a dead short between the
> > spicket copper pipe and the power ground.
> >
> > If it ain't connected, you need to get that fixed right away.
> >
> > 73, Guy K2AV
> >
> > On Thursday, October 29, 2015, Jim Brown <jim@audiosystemsgroup.com>
> wrote:
> >
> >> On Thu,10/29/2015 2:45 PM, Dan Edward Dba East edwards wrote:
> >>
> >>> all my plumbing is copper, hot and cold water, in the slab. and, i
> have
> >>> an outside water spigot just a few feet away from my service
> >>> entrance...should I tie it in too ??
> >>>
> >> NEC REQUIRES that it be tied in.
> >>
> >> 73, Jim K9YC
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