wrote in message
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Hello, From time to time, the lights on two of my electric circuits
flicker at the same time and to the same degree of intensity; other
lights on other circuits are not affected. When this happens, the load
within the house does not change (no AC units coming on, etc.) and the
bulbs are all tight. I have not checked to see the breakers to these
circuits are wired tightly but they appear to be set into the buss bars
correctly because they sit within the panel cover the way they should.
So, some type of voltage drop appears to be occurring on these
circuits. Can bad (old) breakers cause this type of fluctuation?
Other ideas? Thanks! D. MacQueen


In addition to what others have said, it is possible that bad circuit
breakers are the cause although not always likely except with certain
brands. In my area of New Jersey there are several condo developments built
by one particular builder that are notorious for defective circuit breakers.
I think that they were originally made by ITE which is no longer around.
They are identified as the thin type and the bus connection is a hook on the
left or right side of the breaker.