We are having some problems with the AC in our house and I wonder if some of you can give me some idea what might be causing it.
We first noticed it to be lights flickering, and I thought it might be some neighbor using some heavy equipment or something. Then a few days ago while working on the computer I noticed my DSL modem and router just power cycled for no reason.
So I went out and bought a UPS, and at night during 8-12pm, I can see the UPS kicking in every now and then and goes back to AC power. So something's wrong.
I took out my voltmeter and measured it, much to my surprise, one of the AC lines is 90v and the other is 150v. In my room, one of the lamp is very bright while the other one is dim.
After about 12pm, it sort of gone back to normal, both lines register ~120v.
Could a neighbor using some stupid equipment be causing this voltage drop and increase? Has some equipment in the local electrical company gone bad? The problem is not consistent, sometimes it happens and sometimes it doesn't...
Thanks.
Raymond