VOLTAGE, What's yours?

[Stimw]

Check voltage from each leg to neutral to see if they match.
I had 123 V on one leg and 118 V on the other, 240 V across both legs.
I called power company and ask about it late afternoon.
They sent out a crew to change my service drop at 7 pm that night and changed it in the rain!

 

[Industrial Toys]

I did. It was perfectly matched which surprised me a bit.

 

[Tractor Seabee]

Thanks. I may well have an issue. Ambiant temperature and that of cabinets is -16c. Most connections are around 1-3c, but one is at 30 something! And that terminal is discolored. It is a copper conductor leaving the main disconnect and going to the transfer switch. I tightened it, and checked temperature a few minutes later, and it's still higher. Will try again, in case it was still hot from before.

Standard single phase house voltage is 120V. Standard tolerance is +/- 10 percent. Heating can cause corrosion especially with aluminum but also copper and tightening will not correct. Need to pull it out and clean it and use new corrosion compound if aluminum or copper/aluminum combination.

Ron

 

[oosik]

Right at this moment, my APC says, incoming voltage is 123. It is normally - 121 to 123.

 

[MarkF48]

Check voltage from each leg to neutral to see if they match.
I had 123 V on one leg and 118 V on the other, 240 V across both legs.
I called power company and ask about it late afternoon.
They sent out a crew to change my service drop at 7 pm that night and changed it in the rain!

I was going to mention/ask this. Usually an indication of a problem with the neutral connection coming from the street and it's very wise to have that looked at as it could cause damage to electronic gear in your house if not fixed promptly.

 

[MarkF48]

If the OP is towards the end of a long feeder branch, it might be an overall voltage loss from a high residential heating load during cold weather. The substations will usually have step voltage transformer regulators that maintain outgoing voltage and then the feeders may have capacitor banks on the feeders which can correct for some voltage variation. At 115vac that is in spec for a variance from a normal 120vac.

 

[Industrial Toys]

I am toward the end of a pretty long line. It's unfortunate but the power goes around a rural block before getting to me. The auto adjustment equipment is maybe seven miles away.