Re: dirty power
I have learned a long time ago the usefulness of an UPS to keep PCs from getting damaged by power surges or cuts.
Funny, because I live not far from a nuclear power station (about 15km, give or take a few). You'd think that the quality of the power line would be reliable so close to the generator, but you'd be mistaken.
All of my electronic equipment is, at minimum, connected to the mains with a surge protector (TV, stereo, fridge, freezer, etc). In my home office I have a 1600 VA UPS to which all my desktops, my NAS, the connection box and the telephone are connected.
If there is a power cut, I power down the computers and leave just the phone and the box connected to ensure that I can still use my laptop's WiFi if required until the power comes back on.
But I am never again going to trust the mains to give proper juice to my computer equipment. Yes, I know that, in the past 20 years, standards have evolved and computers are more resiliant.
I'm still not taking the risk.