[sdiy] Neutral ground [was: midi optocouplers]

[harrybissell]

uhhh... yeah that sounded pretty respectful :^P

All of the above, er... below... depend on where you measure
the voltages.  There ARE drops in all conductors... and what we
call 'ground' or 'neutral' is really no such thing.

If you drop a jigger of water into the North Atlantic Ocean... does the
sea level rise.   Of COURSE it does... (but its hard to measure, it takes
a while for the change to get noticed overseas... and maybe you don't give
a sh!t anyway :^)

All conductors suffer the same fate... is it good enough ?  (or not ?)

Now... Professor Richter... kindly inform the class about differences in
potential
between supposed 'earth' grounds  (yup... that happens too :^)

H^) harry   (I was going for Dr. Richter, but some folk are funny about
titles...
I figured Professor was OK :^)

Grant Richter wrote:

> > Neutral should have no voltage with respect to earth ground.
>
> With all due respect to Harry.
>
> Neutral will sometimes show a voltage because of the resistivity of
> the copper and current flow.
> With a heavy load running on a long line, I have seen 3-4 volts AC on
> the neutral line.
>
> Of course Harry meant for the kind of current draws you see in a studio.