There are 4 types of alarms. Black out, Under Voltage, High Voltage and
Electrical Noise.

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
battery power.
Does that mean there is nothing I can do except purchase a line conditioner?
Can the power company do anything about this?



"Oren" wrote in message
...
On Tue, 29 Aug 2006 16:14:13 -0400, "Bob" wrote:

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?

I would check the receptacle to start. The unit detects a drop in
voltage and trips, right?. Have you checked the APC site for a FAQ?

Oren