A 3 phase motor can be reversed instantly, that's so fast that you can't see it happen or see that it's turning the other way.
In most cases the voltage to ground is half of what the nominal is, that is if the voltage is 480 between the legs, it's 240 to ground. In a home 120/240, it's 120 to ground. It's surprising the Mr. home owner will try to work on something that's 120 but will not touch 240, even though he is more likely to get bit on one leg to ground, 120 volts.
Along that line the isolated/floating 3 phase that we were talking about, most often 480, if one leg does go to ground, then it's 480 from each of the other legs to ground.
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Today's Featured Article - Oil Bath Air Filters - by Chris Pratt. Some of us grew up thinking that an air filter was a paper thing that allowed air to pass while trapping dirt particles of a particles of a certain size. What a surprise to open up your first old tractor's air filter case and find a can that appears to be filled with the scrap metal swept from around a machine shop metal lathe. To top that off, you have a cup with oil in it ("why would you want to lubricate your carburetor?"). On closer examination (and some reading in a AC D-14 service manual), I found out that this is a pretty ingenious method of cleaning the air in the tractor's intake tract.
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