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Electrical problems Mikko Peltoniemi 05-07-2008
|--> Re: Electrical problems Mikko Peltoniem...05-07-2008
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Posted by RBM on May 7, 2008, 7:40 pm

> So I was on the computer, then all of a sudden I hear BOOM, like an
> circuit breaker tripping, and everything went quiet. The computer
> was off.
>
> I took a peek in the electrical panel, but no circuit breakers had
> tripped. Odd, I thought. But I still didn't have electricity to
> my computer.
>
> I did some investigating, and it seems the bathroom light, and two
> outlets are dark. That's it. Nothing else. Also, with a voltmeter
> I checked each circuit breaker. I thought maybe one of them had broken,
> but was left in the ON position. I took my voltmeter, and checked
> the voltage of each wire going to the circuit breakers against the
> neutral. All came up as 120 V. And when I would turn off any one
> of the circuit breakers, the meter showed 0 V. So it wasn't that.
>
> But still, I have no electricity. What could be the issue? Any
> suggestions?
>
> Other oddball ideas that came to my mind was that maybe those particular
> outlets and lights were connected to my neighbor's circuit.
> Could this be, or is it totally out of the question?
>
> Actually the room where the dead outlets are has one outlet that works.
> Also the light is on in that room. Weird, I thought all the outlets in a
> room would be in the same circuit. And the bathroom, which has no light
> now, has a working outlet also.
>
> I'm pretty much at my wits end, and probably will have to get an
> electrician. But maybe someone would have any experience of a similar
> situation, before I call one to turn a circuit breaker or twist a knob.

Circuits for general lighting are rarely done room by room, so it would be
perfectly normal to have some lights and outlets working and some not, in
the same room. If you heard a pop or "boom" it was probably a short circuit.
This should have tripped a breaker, but clearly broke the electric
connection somewhere along that circuit. The wiring is daisy chained between
lights and outlets on that circuit, so you would be looking for the last
live outlet or the first dead outlet on the chain. Not knowing how the chain
is run, may require the help of an electrician. I doubt it is a matter of
flipping a switch, although it is undoubtedly an easy repair once the
location of the problem is found.



Posted by HeyBub on May 7, 2008, 7:43 pm
Mikko Peltoniemi wrote:
> So I was on the computer, then all of a sudden I hear BOOM, like an
> circuit breaker tripping, and everything went quiet. The computer
> was off.
>
> I took a peek in the electrical panel, but no circuit breakers had
> tripped. Odd, I thought. But I still didn't have electricity to
> my computer.
>
> I did some investigating, and it seems the bathroom light, and two
> outlets are dark. That's it. Nothing else. Also, with a voltmeter
> I checked each circuit breaker. I thought maybe one of them had
> broken, but was left in the ON position. I took my voltmeter, and
> checked the voltage of each wire going to the circuit breakers against the
> neutral. All came up as 120 V. And when I would turn off any one
> of the circuit breakers, the meter showed 0 V. So it wasn't that.
>
> But still, I have no electricity. What could be the issue? Any
> suggestions?
>
> Other oddball ideas that came to my mind was that maybe those
> particular outlets and lights were connected to my neighbor's circuit.
> Could this be, or is it totally out of the question?
>
> Actually the room where the dead outlets are has one outlet that
> works. Also the light is on in that room. Weird, I thought all the
> outlets in a room would be in the same circuit. And the bathroom,
> which has no light now, has a working outlet also.
>
> I'm pretty much at my wits end, and probably will have to get an
> electrician. But maybe someone would have any experience of a similar
> situation, before I call one to turn a circuit breaker or twist a
> knob.

It's not your neighbor.

Turn off the circuit breaker. Test other outlets. Find the one that's now
off but comes on when you energize the circuit breaker.

This is probably the culprit. Call is "SUSPECT." That is, SUSPECT is live,
but everything downstream is dead.

Wires go from the circuit breaker dot-dot-dot to SUSPECT. From there, wires
are SUPPOSED to go to the remaining outlets on the string. Odds are the
wires connecting SUSPECT to everything else have a fried connection.

If the wires on SUSPECT (or to the next downstream outlet) are connected
with stab-in connectors, they've probably made a bad connection, current
increased, and the resulting heat melted something in the outlet.

Fix is easy. Replace the outlet that's at issue. Don't use the stab-in
connections.



Posted by Bob on May 7, 2008, 8:53 pm
Mikko Peltoniemi wrote:
> So I was on the computer, then all of a sudden I hear BOOM, like an
> circuit breaker tripping, and everything went quiet. The computer
> was off.
>
> I took a peek in the electrical panel, but no circuit breakers had
> tripped. Odd, I thought. But I still didn't have electricity to
> my computer.

Follow the BOOM. I would suspect a backstabbed contact on an upstream
outlet burned its way open after intermittent contact arcing.

Posted by Mikko Peltoniemi on May 7, 2008, 9:13 pm
Bob wrote:

> Follow the BOOM. I would suspect a backstabbed contact on an upstream
> outlet burned its way open after intermittent contact arcing.

Ok. I think that'll be the last thing I do before calling an
electrician. It wasn't a loud boom really, was it was definitely
audible. And yes, there is a GFI, in the bathroom, which is live.

I didn't think of the outlets being daisy chained, but yeah, if only
I knew which way the wire goes, I would know which is the last
working outlet...


Posted by CJT on May 7, 2008, 10:41 pm
Mikko Peltoniemi wrote:
> Bob wrote:
>
>> Follow the BOOM. I would suspect a backstabbed contact on an upstream
>> outlet burned its way open after intermittent contact arcing.
>
>
> Ok. I think that'll be the last thing I do before calling an
> electrician. It wasn't a loud boom really, was it was definitely
> audible. And yes, there is a GFI, in the bathroom, which is live.
>
> I didn't think of the outlets being daisy chained, but yeah, if only
> I knew which way the wire goes, I would know which is the last
> working outlet...
>
Hardware stores sell detectors (often combined with stud detectors) that
can help you trace wiring.

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