I have less experience about electricity and electronics but I am so sure that you can't use a pressing iron on a stabilizer, am I right? The grid power is not stable since 30hours ago, it fluctuates up and down and it's affecting my rig so I am thinking, is a stabilizer safe for a mining rig? I'm drawing 1000watt so what's the best stabilizer I can use if I can....
An electric kettle or iron does not need a stabilizer, because they will work at low voltage, only the heating process will be longer.
I have 220 volts in the network, but there are jumps when the voltage drops to 180 volts and a little lower. A long mining experience in the village has shown that ATX power supplies from well-known manufacturers such as Corsair can easily cope with this task.
If your voltage fluctuates between 100-220 volts, then this is illegal, and your electricity supplier must deal with this problem.
Sure the PSUs are suppose to provide protection however can you really trust them in protecting thousands of dollars in equipment? Not worth the risk.
Going between 100 Volts and 200 Volts is not going to happen. Typically what happens is you get something like 90V. And like you said. Most light bulbs or stoves won't be affected but sensitive electronics will be.
90V is worse because it'll cause the current to increase to make up for it. If its over voltage like 140V then most PSUs will quickly shut down.