"Bad neutral" is the correct diagnosis, but obviously your electricians were unable to track it down.
Here's what was happening: The lights were on one leg, and the 120 volt outlets were on the other. If everything is wired properly, there should almost no voltage drop, so the neutral stays at about zero volts referenced to ground. But if there's a bad connection, you'll have voltage drop, and voltage drop can occur in either the hot or cold wires (or both). So, for the purposes of discussion, let's assume your lighting circuits have a five volt drop in the neutral. Now if you add a heavy load on the opposite leg, that will cause the neutral voltage to swing to that leg. So now, maybe the voltage drop in the neutral is five volts, but 180 degrees out of phase with the lighting circuits. five plus five is ten, so the voltage across the lighting circuits increased by a whopping ten volts when you started the motor.
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Today's Featured Article - Talk of the Town: The Saga of Grandpa's Tractor - by The following saga is from the Tractor Talk Discussion Forum. Someone. The saga starts with the following message: Hey guys I have a decision to make. I know what you all will probably suggest and it will probably agree with me way down inside, but here it is. I have a picture blown up and framed in my "tractor room" of a Farmall M. It was my Grandpa's tractor, of which whom I never got to meet. He froze to death getting this tractor out of the barn to pull a truck out of the ditch before I was born. Anyway my dad and aunt had to sell it at the auction,
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