[Gllug] ADSL on BT phone wires

Ryland, Peter peter.ryland at squaregain.co.uk
Fri Aug 18 08:30:32 UTC 2006

On Fri, 2006-08-18 at 05:36 +0100, Christopher Hunter wrote:
> On Thursday 17 Aug 2006 08:56, Ryland, Peter wrote:
> > Loss via ground?!  It's an almost perfect conductor.  Resistance is
> > inversely proportional to cross-sectional area, and the earth's is
> > enough to guarantee that it performs better than copper wire.
> >
> > Earth: ~0.00005 ohms/m
> > Wire:  ~0.01 ohms/m (for 2mm-thick copper wire)
> Dry earth, near the surface is actually a fairly poor conductor, and earth 
> spikes are seldom long enough to be really effective!

I totally agree.  My point was that the distance doesn't matter.  You
can always use better and/or more spikes, and/or even attach your ground
to your copper plumbing.


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