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How Much voltage fluctuation is normal?


My question deals with voltage fluctuation and it's possible harm to my computer.


I bought a APC UPS which allows my to set the thresholds for undervoltage and overvoltage intervention. Since installing it on 11-16 (less than a month) I haven't had any undervoltage alerts (brownouts) but I've had 51 alerts for overvoltage. The trigger point range for overvoltage can be set from 128 volts to 138 volts. I started at the lowest setting of 128 volts but I had so many instances that I increased it to 129 and now to 130.


With a range of 128 volts to 138 volts what figure would YOU use? At what point does overvoltage harm a computers components? Is my situation normal, or does it reflect a problem with my home wireing? I assume voltage regulation is a GOOD THING, but am I worrying too much?

I gues my question is: How much voltage fluctuation is considered normal, and at what point does it become harmful?

Thanks in advance for your reply,



This question was answered on October 21, 2005. Much of the information contained herein may have changed since posting.

Computers can handle up to 800 volts Voltage between 800 & 6,00 volts can damage the computer and the components

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Posted by Kenward of Chandler-Gilbert Community College on October 21, 2005