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Electrical Question ROANIN 11-06-2009
|--> Re: Electrical Question Existential Ang...11-06-2009
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Posted by ROANIN on November 6, 2009, 11:16 am


I have a garage that is fed with a 3 wire feed from one pole transformer and
my house is same from a different pole transformer. Both locations have a
ground rod attached to the box. The cable TV is connected to both sites
using a splitter. ( This was installed by the cable company before I bought
the house) Is this a possible ground problem? The cable eventually connects
the shield to the ground of each television in both locations. Saw a similar
post the other day that got me thinking.....

Roanin



Posted by Existential Angst on November 6, 2009, 11:56 am


http://www.CEEGYNY.ORG
>I have a garage that is fed with a 3 wire feed from one pole transformer
>and my house is same from a different pole transformer. Both locations have
>a ground rod attached to the box. The cable TV is connected to both sites
>using a splitter. ( This was installed by the cable company before I bought
>the house) Is this a possible ground problem? The cable eventually connects
>the shield to the ground of each television in both locations. Saw a
>similar post the other day that got me thinking.....

Anything can happen with ground/hum, but methinks the solution is
dirt-simple, if there is a problem:
Connect both ground rods with a wire.
Proly not a bad idea even if there isn't a problem, if one ground is
superior to the other, which can easily be the case. Codes notwithstanding,
of course.
--
EA




> Roanin
>



Posted by jamesgangnc on November 6, 2009, 12:12 pm


> I have a garage that is fed with a 3 wire feed from one pole transformer =
and
> my house is same from a different pole transformer. Both locations have a
> ground rod attached to the box. =A0The cable TV is connected to both site=
s
> using a splitter. ( This was installed by the cable company before I boug=
ht
> the house) Is this a possible ground problem? The cable eventually connec=
ts
> the shield to the ground of each television in both locations. Saw a simi=
lar
> post the other day that got me thinking.....
> Roanin

You probably have a ground loop. Do you have a hum problem at any of
the tv locations? If not then I would not worry about it. If you do
then the correct solution is to get an isolator for one location. The
quick and dirty solution is to lift the ground at one location.

Ground loops often have a small differential voltage typically present
as 60 cycles. It's not dangerous but often gets into audio circuitry
which is designed to amplify anything between 20hz and 20khz.

Adding more ground connections seldom helps as they all must travel
some distance and that's the reason you have a problem.

Posted by on November 6, 2009, 2:04 pm


wrote:

>I have a garage that is fed with a 3 wire feed from one pole transformer and
>my house is same from a different pole transformer. Both locations have a
>ground rod attached to the box. The cable TV is connected to both sites
>using a splitter. ( This was installed by the cable company before I bought
>the house) Is this a possible ground problem? The cable eventually connects
>the shield to the ground of each television in both locations. Saw a similar
>post the other day that got me thinking.....
>Roanin

EA has the right answer, bond the ground electrode systems together.

When I was in the computer business we fixed a lot of problems this
way when networks spanned several buildings. A lightning strike will
resolve this ground shift through your TV if you don't.

Posted by jamesgangnc on November 6, 2009, 2:30 pm


On Nov 6, 2:04=A0pm, gfretw...@aol.com wrote:
> wrote:
> >I have a garage that is fed with a 3 wire feed from one pole transformer=
and
> >my house is same from a different pole transformer. Both locations have =
a
> >ground rod attached to the box. =A0The cable TV is connected to both sit=
es
> >using a splitter. ( This was installed by the cable company before I bou=
ght
> >the house) Is this a possible ground problem? The cable eventually conne=
cts
> >the shield to the ground of each television in both locations. Saw a sim=
ilar
> >post the other day that got me thinking.....
> >Roanin
> EA has the right answer, bond the ground electrode systems together.
> When I was in the computer business we fixed a lot of problems this
> way when networks spanned several buildings. A lightning strike will
> resolve this ground shift through your TV if you don't.

That won't fix ground loop hum in audio.

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