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If you live in a lightning prone area, and are going to be gone from the house longer than a forecast can reliably ensure you won't have a thunderstorm (most forecasts of any accuracy cease to be accurate after 36 hours), it is generally wise to leave your machine unplugged, as well as any telephone cords, and power to any devices hooked up to the machine. While UPS units can stop power spikes, brownouts, and small power surges, no unit has enough resistance to stop the side arcing lightning can do when it is too close. The source for this information, is this article here:http://wvlightning.com/lmwn5.shtml
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