[TowerTalk] Question about ground

[K8RI]

On 9/9/2012 9:06 PM, Jim Brown wrote:
> On 9/9/2012 6:01 PM, Matt Fearnow wrote:
>> Well the electrical service comes in to the back of the house.  I need to
>> go from there to the side and up to the front to where the entrance into
>> the basement where my shack will be.  A few years ago, an engineer
>> (now SK)
>> had advised me to tie all grounds together, from the electrical, to the
>> "tower", to the cable shields, to the ground plate in the house for the
>> gear.
>
> You got excellent advice.
>
>>    IIRC, was to allow all points to have equal paths to ground.
>
> Sort of -- the intent is to have all parts of the building stay as close
> as practical to the same potential.  It won't be perfect, because
> lightning will induce current on that wiring too, by virtue of its
> proximity, so think of this very good practice as minimizing the
> potential for damage.
>> Else if not, if current came in from the eletrical panel, through the
>> gear, and
>> out through their ground (if that was the shortest path)
>
> That certainly can happen.


Yup. Even with a single point ground the instantaneous potential can be 
be thousands of volts between one end of the house and the other, but 
that is  not normally a problem.

The idea is to minimize voltage differences in equipment. It won't be 
perfect as not all the conductors follow the same paths even if they are 
grounded at the same point.

73

Roger (K8RI)
>
> 73, Jim K9YC
>
> 73, Jim K9YC
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