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#73843 - 01/02/07 08:08 PM Microwave blows up
Peter Offline
Member

Registered: 06/08/04
Posts: 93
Loc: San Diego
This question appeared on the Mike Holt forum and they gave him a lot of advice to "call an electrician":
"I have (had!) an above the stove microwave which plugged in to a receptacle above it in a cabinet. It's been there for over 3 years and operated without any problems. A few weeks ago the microwave stopped working. I replaced the fuse in the microwave and the electronics functioned properly but when it was actually ran, it completely stopped working. I purchased a new microwave, mounted it and the second I plugged it in, there was a large popping sound and a large spark traveling down the backside of the microwave. Needless to say it spooked me a bit."
I would like to expose this question to a wider audience in the hope of finding a cause for this catastrophe.
The only thing I can think of is perhaps a 240 volt receptacle but I somehow doubt it. Has anyone had a similar experience?
~Peter

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#73844 - 01/02/07 08:19 PM Re: Microwave blows up
Lostazhell Offline
Member

Registered: 02/21/04
Posts: 1248
Loc: Bakersfield, CA (Originally Or...
Your typical microwave comes with a NEMA 5-15 plug, so it shouldn't plug into a NEMA 6-15/20 outlet... I'd start with a voltage reading from the outlet under load... Something smells of open neutral/multiwire circuit.

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#73845 - 01/02/07 08:21 PM Re: Microwave blows up
mxslick Offline
Member

Registered: 10/24/04
Posts: 785
Loc: Atomic City, ID USA
 Quote:
Something smells of open neutral/multiwire circuit.


Oh, Bob.....
_________________________
Stupid should be painful.

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#73846 - 01/02/07 08:22 PM Re: Microwave blows up
Lostazhell Offline
Member

Registered: 02/21/04
Posts: 1248
Loc: Bakersfield, CA (Originally Or...
MX you were the first person I thought of when I typed that

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#73847 - 01/02/07 08:24 PM Re: Microwave blows up
mxslick Offline
Member

Registered: 10/24/04
Posts: 785
Loc: Atomic City, ID USA
Thanks Randy!! Now we sit back and wait...
_________________________
Stupid should be painful.

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#73848 - 01/03/07 02:18 AM Re: Microwave blows up
iwire Offline
Moderator

Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
Tony all kidding aside two wire circuits have problems as well.

If you don't want to use the type of circuit that delivers the electricity to your home, that is up to you.

But I will tell you I am tiring of your unsupported posts that multi wire circuits are inherently bad.

You have based your opinion on anecdotal evidence and not science.

Your are certainly entilitled to give your opinion but enough is enough.

Bob

[This message has been edited by iwire (edited 01-03-2007).]
_________________________
Bob Badger
Construction & Maintenance Electrician
Massachusetts

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#73849 - 01/03/07 02:30 AM Re: Microwave blows up
iwire Offline
Moderator

Registered: 01/05/03
Posts: 4343
Loc: North Attleboro, MA USA
FWIW I would also be looking for an open neutral condition somewhere.

It could even be at the utility and the Micro was just the first victim.
_________________________
Bob Badger
Construction & Maintenance Electrician
Massachusetts

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#73850 - 01/03/07 03:17 AM Re: Microwave blows up
Roger Offline
Member

Registered: 05/18/02
Posts: 1779
Loc: N.C.
I will also jump on this bandwagon.

Tony, if it scares you so much then by all means don't use the method, for those of us who do use it and never have problems with it, we will continue to do so. Your bad experiences can probably be attributed more to sorry workmanship of the installer(s)than to the wiring method itself.

If it's so terribly bad you should lobby to have all residential services redone with individual grounded conductors for each ungrounded conductor worldwide, after all they are MWC's.


Roger



[This message has been edited by Roger (edited 01-03-2007).]

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#73851 - 01/03/07 12:29 PM Re: Microwave blows up
LK Offline

Member

Registered: 01/21/03
Posts: 1721
Loc: New Jersey
"Your bad experiences can probably be attributed more to sorry workmanship of the installer(s)than to the wiring method itself."

I am no fan of multi wire circuits, being used just for the purpose of saving a few bucks, but that does not make them bad, or dangerous to install, they have their place, and i would use them without worry, the problems usually arise, when they are installed by someone that does not understand them.

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#73852 - 01/03/07 01:25 PM Re: Microwave blows up
electech Offline
Member

Registered: 02/18/02
Posts: 113
Loc: Northern Il
Consumers should call an electrician any time a replacement item fails out of box.

Though my work is in regulatory approvals / product safety, I say this because one day I may be an electrician...

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