If Bubba only connects the genny ground and not the neutral to the welder plug ground, yeah, the 120 can get really wonky, especially if he's actually pulling 240 off the generator. It can also get wonky if the system ground/neutral tie point is a significant distance from the welder plug.
Knew one guy (a Bubba wannabe) who killed the compressor in his fridge because he hooked the genny Hot wire to one leg of his welder outlet, and Neutral to the other from a cut off extension cord, splitting a floating 120 between both phases. At least he properly connected the ground... O_o I'm guessing the fridge was trying to run on about 80 volts. I had to explain why the lights were going from not quite bright to dim as it tried to cycle.
Scott, to verify what buickanddeere said, yes a 4 wire (twistlock) plug and cord from the generator takes care of both providing a proper isolated neutral and bonding the generator frame to system ground.
A local electrical supply house has a Clint Eastwood quote on the wall behind the counter that is very apt, in a font size that can not be missed: "A man has to know his limitations." Unfortunately, the ones who should heed it most, don't get it.
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Today's Featured Article - The Revival of a John Deere Combine - by The Red, John Fritz. For several years I had been driving by a farm house on the west side of Indianapolis that had a John Deere combine parked in high weeds in a lot behind the house. The gentleman no longer farmed because the entire area was developed with housing and light industry. I had stopped several times and knocked on the door but no one would answer. My curiosity was up and I wanted to contact the owner. I wanted to see what he planned to do with the combine.
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