circuit breaker question

I hope this is the right group for this question.
I have been running two electric heaters (the ones that look like a
radiator) for 3 or 4 years, one in the kitchen and one in the bathroom.
They are on different circuits.
I have never had any problems but 2 weeks ago, they both tripped their
breaker at the same time. I reset the breakers and haven't had a problem
I am just curious as to what could have caused it. Could a low voltage
surge have come in from the power company and caused them to do this.
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The two circuits probably share a common neutral, which is loose.
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Or the elements are shot and shorting req
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They are separate breakers in a 200 amp breaker box and it's now a month later with no problems with either heater.
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What seems more likely is that the voltage went high long enough to cause excess current flow that exceeded the breakers' trip points.
-- Tom Horne
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Tom Horne

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