[K12OSN] Networking a new school for K12LTSP?

[Julius Szelagiewicz]

bad idea. to compute the size of the grounding cable (or size of conduit
if you want to use that instead) assume 250 million volt hit coming from a
lightning striking one of the buildings. ground the buildings correctly
and separately, put a lot of dielectric between them (fiber). you'll be
much happier after the first thunderstorm. grounding is way more complex
than it seems at first look.
julius

On Tue, 30 Jan 2007, Rob Owens wrote:

> To eliminate the ground plane problem, couldn't you
> just run a grounding cable from one building to the
> other (in the
> same conduit as your network wire).  This seems to me
> like it would solve the problem, but I'm not 100% sure
> -- and I
> don't know if it is allowed by the electrical code
> (but I don't see why it wouldn't be).
>
> -Rob
>
> On Thu, Jan 25, 2007 at 11:47:57AM -0400, John Lucas
> wrote:
> > One other consideration when networking multiple
> buildings: using fiberoptic
> > cabling (instead of copper) between buildings would
> reduce the chances of
> > incurring grounding loops. Unless there is a single
> ground plane for all
> > wiring, when there is a short, it will take the
> shortest path and that could
> > be through your network equipment. The chances of
> one building having a
> > common ground plane are much greater than multiple
> buildings sharing a common
> > ground plane; don't import another building's
> problems. I have learned this
> > from sad experience, profit from my folly. It is way
> expensive to do the
> > backbone correctly the *second* time, instead of the
> first.
>
>
>
>
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