And don't forget, long distance transmission lines are ususally a composite
cable with a steel centre and outer aluminium conductors. (to increase the
strength of the cable & allow  a reasonable distance between towers). With
AC, the steel can contribute to additional magnetic losses, in addition to
the resisitive effect.

Richard P




                    Herbert Graf
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                    Sent by: pic           Subject:     Re: [OT] Saftey issues: AC vs DC
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                    28/04/03 09:12
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> Bob Ammerman wrote:
> > DC is used for very high voltage (1 MVolt+!) long
> > distance power transmission. For one thing, it
> > avoids the skin effect.
>
> Could you, please, estimate the depth of a skin
> effect in copper lines at 60Hz AC.

        More then enough when you consider the number of amps flowing.
Remember,
we're not talking about 22 gauge conductors... TTYL

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