I have an APC backup surge protected that keeps reporting that it is falling
over to backup power because it detected line noise. This happens 5-10
times a week. Anyone know what line noise is and what causes it?
Line noise is a disruption of the normally smooth sine-wave pattern of the
AC mains. Some equipment is more susceptible to it than others.
It happens when things like old/faulty switchgear are on the line,
substation demand variation, in fact your own property can even be the
source of the noise.
Why not install a conditioner between the mains & your unit?
There are 4 types of alarms. Black out, Under Voltage, High Voltage and
Its says in the help....
Electrical noise is unwanted electromagnetic energy that goes to the
battery backup from your AC utility power.
This energy lowers the quality of signals and data.
Its origin could be an electrical transformer in your area, for example,
or a power generator.
When there is too much noise, your battery backup intervenes by supplying
Does that mean there is nothing I can do except purchase a line conditioner?
Can the power company do anything about this?
I had an APC unit and, (naturally) after it went out of warranty, it
started reporting frequent overvoltages. I called the power company and
they did send a man out (they no longer have two on a crew; if the one
grabs a hot wire he is supposed to call in on his cell phone) and he
checked. He didn't find a problem, but did switch out the meter as he
found some corrosion there. The point is that the power company did
come out and check.
I called APC and they suggested a new battery in their unit, but that
didn't solve the problem, so now I am looking for another brand of UPS.
It's almost certainly related to some bit of equipment being
turned on and off. Check the APC logs and see if there's a
pattern -- same time of day or whatever. Obviously, if the
start/stop is driven by something else like a thermostat, it
may appear somewhat random.
The equipment causing the gitches may be on your property.
Ot it might be some distance away. If it is your own air
conditioner, fridge, or whatever, it *may* suggest an
impending failure there too. If you can locate the specific
bit of kit, a brief inspection would certainly be in order.
In more serious cases, your electric utility may be willing
to investigate but I doubt that applies here based on your
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