Surge protectors have devices that protect against both differential (hot to cold) and common mode (both legs to ground) voltage spikes. Obviously, if a surge protector isn't grounded, it has no way to limit common mode voltage. Excessive differential voltage is more dangerous to equipment than common mode voltage, but a typical surge will have both differential and common mode components. So an ungrounded protector is better than none at all, but not nearly as effective as one that's grounded.
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Today's Featured Article - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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