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Paul[_12_]

On Tue, 27 May 2008 12:26:03 -0700 (PDT), "hr(bob) "
wrote:

On May 27, 10:46*am, dodger741 wrote:
On May 26, 6:24 pm, wrote:

The microwave has been working normally for almost 5 years, but has
recently started making a buzzing sound on start up.

Sounds like your microwave is the culprit and ready to die. *GFCI
circuits must be fairly sensitive to sense small inbalances in current
in their respective circuit. *If the microwave is injecting
significant EMI back into your house circuit, no telling what could
happen. *You could test this theory if you have some sort of emi
filter you could plug the microwave into between the outlet and oven.
I don't know if a surge protector power strip provides any sort of emi
filtering or if it just protects against over voltage spikes.

I have a little mini-tesla coil for checking out high vaccuum stuff.
It generates a huge amount of EMI. It will set off any GFCI that is on
it's circuit, even though the device is 2-wire. Naturally the spark
goes to ground, and would trip a GFCI. Perhaps your microwave has a
high voltage breakdown and that's what is causing the circuit to trip.
Does it do this more on humid days?

-Paul