I purchased a new
"Astron" 35 amp linear power supply a few years back, and every time I turned it on it made a rather loud
"thump" sound, which was the current in rush to the transformer. It bothered me, so i installed a couple
"MOV" from the line side to the ground, and from the neutral side to the ground. Now when I turn it on it makes no sound at all!!
In America according to the
"NEC" (National electrical code) we are not allowed to have more than "3%" voltage drop to any load from the main panel board.
Resisitive loads simply use less power if fed with less voltage, but
"inductive" loads will draw more power if fed with less voltage, which could and often will burn up the device.