AC dead short?

[one_dusty_hoot]

Tom, A polarity tester operates when voltage is
present. A dead short trips the breakers before
a reading could be made. Good for polarity testing,
not good for dead shorts.

A dead short is a ground on the line(s). The only way
I know how to find one is to isolate by disconnecting
sections of the system.

You say 2 circuits, vaccum cleaner and front receptacles
Are these tired together or seperate breakers? If
seperate breakers, try one then the other. Power off,
with a a multimeter on ohms position. Dead short is 0 ohms.
If not, Isolate and check everything. Sometimes the
load side of a breaker has more than one wire, to find
out, remove the front.

Bob Janes '87FC35 Greenville, SC



--- In WanderlodgeForum@yahoogroups.com, Tom Warner
wrote:
>
> Get a cheap $5 polarity tester that you can insert in each wall
> receptacle and check for bad grounds etc. YOu should find the
problem
> quickly using it.
>
> tom warner
> 1985 PT 40....just like shanes
>
>
>
> At 01:01 PM 8/22/2006, you wrote:
> >Bill,
> >Is this the modification where we send the dinette control panel
to PMMI
> >for mods? How about the polarity tester lights in the shore power
> >connection panel, or does this get resolved by the modification to
the
> >dinette control panel?
> >
> >Curt Sprenger 1987 PT38, Anaheim Hills, Calif.
> >
> >
> >
> >pattypape wrote:
> >
> > >
> > >
> > > Is this a GFI protected pedestal outlet???
> > > Usually they are on the 15/20 amp park hook- up circuits.
> > > An old Bird will trip GFI if the polarity tester lights
> > > have not been modified.
> > >
> > > Bill 88 FC
> > >
> > > --- In WanderlodgeForum@yahoogroups.com
> > > , "John Ely"
> > > wrote:
> > > >
> > > > I have just developed a dead short in two circuits of my AC
> > > system.
> > > > The front receptacles and the vacuum cleaner circuits appear
to be
> > > > dead shorted. If they are on, the park circuit breaker (30
amps)
> > > > trips. If they are off, I get normal service from the park.
The
> > > > thing these two circuits have in common is the AC meters on
the
> > > > dinette control panel. The front receptacles circuit provides
> > > power
> > > > to one of the dinette AC meters while the vacuum cleaner
circuit
> > > > provides power to the other. I have removed all loads from
both
> > > of
> > > > these circuits with no change. I've pulled the cover from the
> > > breaker
> > > > box and these breakers have only one 12ga. wire going to
them, so
> > > the
> > > > meters must be wired in downstream somewhere, but I have no
idea
> > > where
> > > > or even where to look. As a possibly related matter, about two
> > > weeks
> > > > ago, after a lightning storm near Montreal, I noted that the
> > > polarity
> > > > indicators in my service box (the place where shore power is
> > > > connected) are no longer working. As there are also polarity
> > > > indicators on the dinette panel, there is a possible likage
here.
> > > > However, there was a two + week span of normality between the
loss
> > > of
> > > > polarity lights in the service box and the short circuits in
the
> > > AC
> > > > panel. No incident occurred prior to the AC loss; it worked
fine
> > > in
> > > > one park, we took a long (15 hour ferry ride) with the DC
systems
> > > shut
> > > > down, and had the shorts as soon as I plugged in at the next
park.
> > > > If anyone has any ideas as to what this might be, I'd be glad
to
> > > hear
> > > > them.
> > > > John Ely, 86PT40, Rapid City, SD On the road in Clarke's
Beach,
> > > > Newfoundland
> > > >
> > >
> > >
> >
> >
> >
> >
> >Yahoo! Groups Links
> >
> >
> >
> >
>