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Sparks/Arcing coming from Air conditioner duct work.

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Sparks/Arcing coming from Air conditioner duct work. mark.gustavson 09-12-2007
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Posted by on September 12, 2007, 8:00 am
Last night at approx 1:30 am my wife and I awoke to a firecracker
sound coming from the attic over our bedroom. It was very loud. I
climbed up into the attic and saw sparks popping off of the main AC
duct, looked like it was coming from an area that had been sealed by
aluminum tape. We turned off the main breaker in the house and the
sparks continued.

It appears to be a chemical reaction of some sort, and not
electrically created. If someone has ever heard of this or can give
me some advice whether to call a Duct installer, or electrician it
would be greatly appreciated.

Thanks!

Mark


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Posted by JoeSpareBedroom on September 12, 2007, 10:26 am
> Last night at approx 1:30 am my wife and I awoke to a firecracker
> sound coming from the attic over our bedroom. It was very loud. I
> climbed up into the attic and saw sparks popping off of the main AC
> duct, looked like it was coming from an area that had been sealed by
> aluminum tape. We turned off the main breaker in the house and the
> sparks continued.
>
> It appears to be a chemical reaction of some sort, and not
> electrically created. If someone has ever heard of this or can give
> me some advice whether to call a Duct installer, or electrician it
> would be greatly appreciated.
>
> Thanks!
>
> Mark
>

Why do you think it's a chemical reaction?



Posted by on September 12, 2007, 10:42 am
>
>
>
>
> > Last night at approx 1:30 am my wife and I awoke to a firecracker
> > sound coming from the attic over our bedroom. It was very loud. I
> > climbed up into the attic and saw sparks popping off of the main AC
> > duct, looked like it was coming from an area that had been sealed by
> > aluminum tape. We turned off the main breaker in the house and the
> > sparks continued.
>
> > It appears to be a chemical reaction of some sort, and not
> > electrically created. If someone has ever heard of this or can give
> > me some advice whether to call a Duct installer, or electrician it
> > would be greatly appreciated.
>
> > Thanks!
>
> > Mark
>
> Why do you think it's a chemical reaction?

I turned off the main breaker and it still was sparking... there are
no electrical wires near the location of the sparks unless there are
wires inside the duct work


Posted by JoeSpareBedroom on September 12, 2007, 11:33 am
>>
>>
>>
>>
>> > Last night at approx 1:30 am my wife and I awoke to a firecracker
>> > sound coming from the attic over our bedroom. It was very loud. I
>> > climbed up into the attic and saw sparks popping off of the main AC
>> > duct, looked like it was coming from an area that had been sealed by
>> > aluminum tape. We turned off the main breaker in the house and the
>> > sparks continued.
>>
>> > It appears to be a chemical reaction of some sort, and not
>> > electrically created. If someone has ever heard of this or can give
>> > me some advice whether to call a Duct installer, or electrician it
>> > would be greatly appreciated.
>>
>> > Thanks!
>>
>> > Mark
>>
>> Why do you think it's a chemical reaction?
>
> I turned off the main breaker and it still was sparking... there are
> no electrical wires near the location of the sparks unless there are
> wires inside the duct work
>

To me, this doesn't point to a chemical reaction, but hey...I could be
wrong. Let's see what others suggest.



Posted by Noozer on September 12, 2007, 11:46 am

>>>
>>>
>>>
>>>
>>> > Last night at approx 1:30 am my wife and I awoke to a firecracker
>>> > sound coming from the attic over our bedroom. It was very loud. I
>>> > climbed up into the attic and saw sparks popping off of the main AC
>>> > duct, looked like it was coming from an area that had been sealed by
>>> > aluminum tape. We turned off the main breaker in the house and the
>>> > sparks continued.
>>>
>>> > It appears to be a chemical reaction of some sort, and not
>>> > electrically created. If someone has ever heard of this or can give
>>> > me some advice whether to call a Duct installer, or electrician it
>>> > would be greatly appreciated.
>>>
>>> > Thanks!
>>>
>>> > Mark
>>>
>>> Why do you think it's a chemical reaction?
>>
>> I turned off the main breaker and it still was sparking... there are
>> no electrical wires near the location of the sparks unless there are
>> wires inside the duct work
>>
>
> To me, this doesn't point to a chemical reaction, but hey...I could be
> wrong. Let's see what others suggest.

Only two things that I can think of...

A wire has fallen onto the roof and is somehow grounding out on your
ductwork. Not very likely though.

The power supply on your A/C unit may have some large capacitors in it that
could take a few minutes to drain after the power was cut.

What did you do to finally get it to stop sparking?



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