I'd haul an electrician out ASAP to deal with it.
I'm all for replacing fixtures, switches, and receptacles myself, but when
things start making strange noises, or other weird poltergeist type thing
are going on, I step back and let the pro figure it out. With a 60 year old
house and an unknown number and quality of contractors and fiddlers making
'improvements' over the years, I've found some strange methods were used to
get things working, not all of them safe. For instance, in the kitchen I
went to replace a light and receptacle combo, and found a mess of wires
behind the old switch. A visit from the electrician found that there were
two circuits, branched off the same wire, stuffed in there. The second one
was chock full of power. Another time the conduit and the ground wire had
110v across. That would have been interesting.
I"d replase it pronto, and if the next one does the
same thing, there's something "differnt" somewhere. A
GFCI, AFAIK, only hums when it's defective or under
heavy load. The TEST button is an indicator of whether
it's working or not, but it's NOT necessarily an
indicator that it's tripping WHEN it should, or of how
much protection it's affording. Stuff happens, so
check it out. Is this new? How long has it been doing
While you're at it, check out the rest of the things on
that line; is there a heavy load there and is the
switch rated to handle it? Is everything else working
wrote in message
Good chance it is the transformer for it's power supply. Same as
flourescent ballasts, the 60 Hz changing magnetic field can cause
physical movement which you hear. If this is the source and it is not a
nuisance, it can be ignored. If it is loud enough it is a defect and
could probably be replaced under warranty.
Yes, thats probably it. I remember one time brushing my teeth in the
shower and wondering if I brushed at 60Hz because so many external
sounds were 60Hz. I wonder what speed eurpoeans brush at?
Anyway, its a 3 year old house, and its been humming since I got there
1.5 years ago. Everything seems to work, and there is usually no load
on the circuit. It hums regardless of load though.
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