[Gllug] ADSL on BT phone wires

[Christopher Hunter]

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!

Chris

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