How about whan a truck rolls by or you walk heavily around the house or wind
blows strongly.

Might these two circuits share the same 12-3 Romex cable? In that case they
would share the same neutral wire and that is what may be loose.

Alternatively, they may both go to a double (two- half sized) breaker in
which case they are on the same breaker (body not switch) and would share
the same contact to the bus bar. If you have an open slot, move the breaker
to this position. Arcing between the bus bar and breaker contact will erode
the metal and result in an intermittant contact. You need to replace and
move the breaker if that is the case. Listen for a buzzing in the box while
the light flicker and that would support this theory.


wrote in message
oups.com...
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