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Wire confusion

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Wire confusion noel8 01-03-2007
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Posted by noel8 on January 4, 2007, 8:30 am



dpb wrote:
> noel8 wrote:
> > dpb wrote:
> > > noel8 wrote:
> > > > I noticed at the switch box of my ceiling fixture, there are 2 black
> > > > wires ( no painted white wire) and
> > > > I get a light lit up on my light tester.. i took a look again at the
> > > > ceiling 2 red wires (no painted white wire there either) and I cannot
> > > > get a reading on either wire by ground. How is this possible? I did
> > > > have a fixture there before.
> > >
> > > Aha! _THERE_ is a switch as surmised but previously undisclosed! :)
> > >
> > > What bam said -- is one (or more) of the reds hot if the switch is on?
> > > Is this a single pole switch or a three (or even a four) way (is there
> > > more than one location that controlled this fixture before or only the
> > > one, iow)? If the latter, then also need to check w/ that other switch
> > > (switches) in the other position.
> > >
> > > All that is now revealed is that you know you have a supply to the
> > > switch and that the others aren't at this point being fed. Still not
> > > enough information to trace the wiring remotely. As noted, still don't
> > > know if this is a single switch or one of two or more, whether these
> > > red wires are part of a three-conductor cable (which would be pretty
> > > indicative of a three-way or more arrangement and so might be
> > > "travelers", not actual feedthroughs, etc., etc.).
> > >
> > > Can only reiterate that at this point when you don't know for absolute
> > > certain the original connections any longer, I think your only real
> > > hope is to get somebody who can diagnose the situation and figure out
> > > what was the original configuration.
> >
> > This is a single switch ..the 2 red wires are the only ones shown in
> > the ceiling and the 2 black are the only ones on the switch. None other
> > are shown. It is not the only one on the circuit, but that switch is
> > only good for that ceiling fixture, which worked perfectly before under
> > those conditions. I just didn't like the globe look, so I myself, took
> > it off and no one has messed with any of the wiring. Its not as
> > complicated as u made it sound. I'm just confused the way those 2reds
> > and 2 blacks were setup. Apparently, it worked just fine. With the
> > power on and I get a light when testing those 2 switch black wires and
> > don't get any when I check those 2 red wires.. where will the power
> > come from, if not from the switch, is my question.
>
> I'm not making it sound complicated, I'm trying to figure out what
> you're describing -- until the last post, you hadn't even confirmed for
> sure there being a switch as best I can recall. I was simply trying to
> elicit sufficient information if possible to understand what might be
> the situation and red isn't a very common wire color for two-wire Romex
> cable, so simply was asking to make sure that there weren't yet more
> factors at play.
>
> Still can't really tell for sure, but seems as though one of the blacks
> must be the feed. But, still not clear whether you're talking of two
> separate black wires at the switch or the two ends of the same black
> wire landed on the switch. The connections at the switch really
> shouldn't have come into play. IIRC, there was also an adjacent
> outlet? I'd suspect the feed came from that direction and then went to
> the light and on to the whatever the others power w/ one sidetrack to
> the switch for the light. But, if the reds are dead, something else
> must not be working, too???? If not, that still makes me wonder their
> real purpose might be undiscovered and something different than you're
> thinking...like another switch.
>
> I don't have any further ideas on how to diagnose this from afar,
> sorry...maybe someone else lurking will take a stab at it. Good luck,
> anyway.

I'm sorry, my intentions were not to offend. Yes, those 2 black wires
seem to be 2 separate black wires as far as i can see, unless i rip up
the jamb where its installed, and the same goes for the red wires.
There are adjacent outlets on this circuit in the kitchen ( 2 ) and
they work perfectly and check out fine with the light tester. Thanks
for your input, and Happy New Year:)


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Posted by dpb on January 4, 2007, 9:49 am



noel8 wrote:
...
> ... those 2 black wires
> seem to be 2 separate black wires as far as i can see, unless i rip up
> the jamb where its installed, and the same goes for the red wires.
> There are adjacent outlets on this circuit in the kitchen ( 2 ) and
> they work perfectly and check out fine with the light tester. ...

Thinking about this some more last night... :)

Had two thoughts--

First, have you checked to make sure you didn't trip a breaker when you
previously hooked the white to one of the colored wires? (I don't
recall now for absolute certain, but seems you had first noted
connecting a white to either a red or black which really sounds wrong
unless it was the switch return but then it should be the hot side of
the light, not a feed). If so, perhaps the feed isn't hot while you're
testing because the breaker is still off. That's one thing to at least
check.

Second, in general, the feed should be hot irrespective of the position
of any switch(es). So, first step is to probe until you find it, then
work logically to what the other wires must serve and discern the
layout. At the switch, if it is indeed only a single-throw, there
should be only two terminals and typically, a two-conductor romex would
come from the light. That's where the "white as hot that should be
marked" comes from--the black hot on one terminal and the white as the
hot return (should be marked as hot at the ends by code). It still
isn't possible to tell unequivocally whether that or some other
configuration is what you have at the switch. If the feed were from
the switch itself, then the hot would be "broken" by the switch and two
ends of the same conductor would be on the terminals and the white
would go straight through to the fixture. But, in that case, that
would have to be the terminus feed for that circuit branch as anything
beyond that point will be switched. So in this case, the feed has to
be from somewhere else.

If there is a second unbroken black through this box, that would be a
likely candidate as a feed, certainly. But, both of those blacks
should have their corresponding neutrals or whites with them and you're
not clear about that.

Hopefully those will be some things to use to help you work through it
logically and figure out what was done. Of course, it is also possible
if improbable you might have had some coincident failure or in messing
around with the wiring caused a existing loose connection somewhere to
finally open and that the actual source of the confusion/consternation
is elsewhere.

I keep coming back to the unpowered reds that have to be hooked to
something else that's not working that should be a useful clue...

Again, if you have a hand B-I-L or neighbor or other buddy, might be
time to try to call in some favors... :)

If these overhead reds are not hot, then whatever they're feeding (or
fed from) isn't


Posted by Goedjn on January 4, 2007, 11:28 am



>I noticed at the switch box of my ceiling fixture, there are 2 black
>wires ( no painted white wire) and
>I get a light lit up on my light tester.. i took a look again at the
>ceiling 2 red wires (no painted white wire there either) and I cannot
>get a reading on either wire by ground. How is this possible? I did
>have a fixture there before.

SInce they don't make wires different colors at different ends,
there must be either more wires than you're describing,
or another box between the two points, or both.





Posted by noel8 on January 4, 2007, 6:45 pm



Goedjn wrote:
>
> >I noticed at the switch box of my ceiling fixture, there are 2 black
> >wires ( no painted white wire) and
> >I get a light lit up on my light tester.. i took a look again at the
> >ceiling 2 red wires (no painted white wire there either) and I cannot
> >get a reading on either wire by ground. How is this possible? I did
> >have a fixture there before.
>
> SInce they don't make wires different colors at different ends,
> there must be either more wires than you're describing,
> or another box between the two points, or both.

This is an old house and romex wasn't available at the time. its the
old BX cable. I did nothing to either area of those wires...just
exposed the the wires so I could test them with a light tester. There
are definitely no other wires in view either in the switch area or the
ceiling...2 reds there and 2 blacks at the switch. Maybe when it was
setup originally, whoever did it either forgot to paint one of those
wires white or did not know about it. It could of been done by a
previous owner who may of been limited in knowledge of this. With the
power on, I do get a light, on the black wire at the switch, but not at
the 2 reds in ceiling. Maybe something has to be hooked up to those 2
red wires ( such as the globe that was there before ) in order to make
contact...after all it worked before with this setup.


Posted by Sev on January 4, 2007, 7:15 pm



As Goedjin says, there must be intermediate junction between switch
and fixture. Possible you pulled a wire loose from its other terminus
when you removed old fixture. But if you're sure _both_ black wires at
switch have power in on position (indicating switch is good) , then
you're going to have to find that other junction- possibly feed
through at nearby recep.
If this is old BX, you may also have broken a brittle wire within
the cable- not a pleasant possibility.


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