![]() Someone turns on a large load and the voltage dips, the power company notices this and adjusts it's output voltage to compensate. If the inductance is large and someone turns on a large load (without inrush/startup current) then you could see a similar effect where the mains voltage dips for a few moments. The power distribution wires also have inductance. If the power distribution wires have lots of resistance due to length or corrosion then this effect will be worse. ![]() This is sometimes called "inrush current", but in a table saw this is "startup current". Many devices consume the highest power immediately after power-on and then quickly settle down to something normal. ![]() Here they are, in rough order of decreasing probability: If someone turns ON a large load (my table saw does this), it will cause the mains voltage to sag for a second or three and then it recovers while the load is still on.
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