Well Dirty is a pretty dirty word right....:0
I think I'll change that to degenerated waveform..??
Yea..that's better..when you produce power at the Hydroelectric plant or whatever they do a pretty good job of making that smooth sine curved 60hz frequency and it comes to you supposedly like that...Now ED down the street has a military surplus generator that he didn't realize was 400hz and he threw this baby online and tried to sync up. of course it didn't work but that still affected you as it back-fed the grid.. Now your getting power in a building that is wired in such a manor that its in steel conduit and a lot of low amp computers create a resonance..the pipe gets hot and you keep losing voltage and your ups system goes beep and the power goes on and off and the fluorescent lights have a funny flicker ,all the while the refrigerator in the break room is humming a funny sound..Well all this ,please excuse my run on sentence, is created from outside noise affecting frequency which affects motor speeds and refresh rates for everything...so what can we do..Well we can try to find ED and ask him to stop..(never happen) and at the office or home we can get a sensitive ups and just live with it,,PF (power factor correction) capacitors and MOV (metal oxide varister) and all the shielding is not going to take out the RF created from ballasts and resonance. Circuit dividing and reassigning the distribution will help but by far it's easier to find a fix than a cure...When you blow a fuse here is what happens ..You have reduced the voltage and increased the amperage..power companies fault or you overused the circuit ,Your fault...If it happens at night its probably due to under-voltage and you have to call the power company to explain..The generally will say "what??" ask for the field engineer for your area don't fight with the front desk..Well have a good one and watch out for under-voltage....from the E.