On 9/12/2012 1:33 AM, Jim Brown wrote:
This has the potential stink of one or more wiring errors INSIDE your
home.
Jim...
I setup the computer to monitor the noise 24 hours a day. It's been a
few days now and it's only come on at night between 7:00PM and 7:30PM.
There is no noise present during the day.
Assuming it is a house wiring problem and not an appliance, what would
cause it to come on in the evening and stay on till morning? Would
temperature and humidity cause this?
Finally, make sure that there's REALLY a ground on the panel where
power comes to the building, and that it goes to something going to
the earth. That's another thing that was wrong here. :)
Good advice Jim. The house was built in 1984 and there is a ground rod
attached to the panel. I'll check the connection tomorrow morning.
Thanks
Tony -K2MO
If that is the case, what condition would make it so the noise only
appears at night?
Look for all the simple dumb mistakes -- outlets wired with phase
(hot) and neutral reversed, or with ground (green) and neutral
reversed, light switches wired wrong, extra bond(s) between neutral
and ground (there must be one, and only one, and it must be in the
main panel). It's common for there to be extra bonds in laundry
appliances. Look also for an appliance (or outlet, or even that
light) getting power between phase (hot) and Green, rather than
between phase and neutral.
It's a rare building that doesn't have at least one of these problems.
The home I bought here in CA had all three.
Finally, make sure that there's REALLY a ground on the panel where
power comes to the building, and that it goes to something going to
the earth. That's another thing that was wrong here. :)
73, Jim K9YC
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