Graph of "120 volt" variations

By Bill Meier; posted September 4, 2004

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Here is a graph of the voltage at my house for the last day. We have not had any abnormal events, storms, etc. so I assume these fluctuations are normal. I have seen them before. You can see the voltage go between 120 and 127. If it is outside the given range, it switches to battery operation.

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