![]() 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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