[SunRescue] 690mp & 240VAC

[jcarverjcarver at ipns.com]

Nick, 

What he is referring to is also the the Code in this country. The NEC
(National Electrical Code) states that all installations will provide
one point of "Bonding" where the Neutral and Ground systems are in fact
tied together. On a residential service, this usually occurs in the
customer breaker panel. If you look very closely you will notice that
there is either a tie strap between the ground and neutral busses or
that
one of the screws holding the neutral buss bar in the panel is tied into
the panel can itself. If you are getting major sparks and flashes,
PLEASE
check that you have a good water pipe bond and adequate ground rods for
your system. Most power Companies no longer pay customer claims for open
neutrals. Not only is the relation between ground and neutral an issue,
but with an open neutral the voltage on either leg of your service can
increase and decrease dramatically as load changes. 70 volts will do
nasty things to your fridge and freezer if the compressor motors try to
run. On the issue of water pipe bonds, don't make a trap for yourself
by placing pieces of PVC between you and the street.

				Jim Carver



nick at snowman.net wrote:
> 
> Err.  I think we have a colision of terms.  Neutral is not ground, and
> ground is not neutral.  Neutral-ground can provide some quite entertaining
> sparks, brownouts and blackouts here.
>         Nick
> 
> On Sun, 22 Oct 2000, Stefan Skoglund wrote:
> 
> > nick at snowman.net wrote:
> > >
> > > Yeah, I belive that is correct, but you'd need a RMS meter.  The problem
> > > with a "standard converter" is most ovens/motors/dryers/etc don't care
> > > about ground, and so have phase-1, phase-2, and neutral.  No
> > > ground.  Almost all computers/electronics/etc have Phase-1, Phase-2,
> > > Neutral, and most important Ground.
> >
> > ARGHHHH !
> >
> > They don't need a neutral connection because the elements is
> > 240V and the switches lamps and so on is rated for 240V !
> >
> > I wouldn't want to touch something which doesnt have a proper
> > ground ! Ungrounded eq with a metallic chassis is
> > inherently dangerous.
> >
> > Power tools and lamps is usually double-insulated which means
> > that the user is protected against failures in the inner
> > parts of said eq.
> >
> > Here in sweden at least house ground, house neutral and neutral
> > incoming line is connected to each other in the central electric
> > breakout box AND nowhere else !!
> >
> > _______________________________________________
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> > http://www.sunhelp.org/mailman/listinfo/rescue
> >
> 
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