Voltage Fluctuation

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  #1  
Old 06-22-14, 01:07 PM
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Voltage Fluctuation

Ive noticed the line voltage in the house has varied at different times. I have found it as low as 115-116, sometimes spot on at 120 and the majority of the time it measures about 122. And it changes from day to day or even time of day.

When I measure the voltage I get the same reading at outlets on either leg of the service. But sometime one leg might be 1 or 2 volts higher than the other.

I know there is a percentage tolerance from the POCO, but I was wondering, is it normal for it to fluctuate like this? Is this something worthy of further investigation?
 

Last edited by ardmi; 06-22-14 at 01:47 PM.
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Old 06-22-14, 01:48 PM
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Sure..... the voltage varies constantly throughout the day. Your voltages are actually very close and are normal.

I'm sure out there you'll see some 110v days when it's hot and everyone's A/C is running.
 
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Old 06-22-14, 01:56 PM
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Yes, it is....and yours is well within spec. I believe the fluctuation can be up to 5%?
 
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Old 06-22-14, 02:11 PM
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Voltage +/- 10% is considered normal.
 
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Old 06-22-14, 03:34 PM
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What am I thinking of? A/C caps maybe?
 
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Old 06-22-14, 03:37 PM
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Nah...Some people like to keep it +/-5% for sensitive equipment, but the industry standard is +/-10%. That why 208v equipment will work fine on 240v, and vice versa.
 
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