As far as you don't use anything else than a __ dedicated wire connected to
the earth network of your house or building __ which impedance is low
enough forget about it !

50 to 100 Ohms look good for an earth ground. It may increase up to 1000
Ohms or more in
a dry rock soil. It's up to you to wet the earth pole.

I think that your white return line is the neutral wire. With the exception
of very specific cases it isn't connected to the earth. PROHIBITED and
DANGEROUS to use an existing wire in a two-wire line. In some cases it may
raise pretty high above the earth equipotential. Moreover you aren't free of
any error committed by an employee resulting in the application of the live
to your equipment case. Don't forget that a mains line is not polarized.



----- Original Message -----
From: "Rodney Kelp"
Newsgroups: sci.electronics.repair
Sent: Friday, November 12, 2004 4:14 PM
Subject: Grounding


If you have a 2 wire house electrical system what's the difference between
a
3 wire system and installing a 3wire plug and jumping the ground pin to
the
white return line. I see no electrical difference between that and running
a
green wire all the way to the box and connecting it to the same place as
the
return line ground. If you know what I mean.