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Old 09-08-2013, 09:37 PM   #1
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loud humming from auto transfer switch. normal?

So after hooking up our GT351 to 50a service I noticed a very loud humming from the auto transfer switch. Everything worked fine but the humming persisted. I unplugged and replugged and the humming stopped.

Thoughts?
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Old 09-08-2013, 10:35 PM   #2
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I'm a electrician and have heard contactors do this now and then.
I suspect the bouncing around may have made the contactor out of alignment and when you energized it stayed a little cockeyed.
By de-energizing and re-energizing it seems to have realigned ok.
Nothing to worry about unless it happens every time you hookup.
I doubt it will happen again.
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Old 09-08-2013, 10:43 PM   #3
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Thx Iggy. All is working fine, and was even with the humming, just seemed much louder than I would think is normal. Appreciate thw reply. I'll update with any changes.

Thx

Mike
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