Utility voltage parameters.
- Thread starter nizak
- Start date
electrofelon
Senior Member
- Location
- Cherry Valley NY, Seattle, WA
I would say that is low and would call it in. Could be something like a bad regulator on the line.
I’m unable to contact anyone in Engineering at the Utility.
Another electrician I spoke with said that 5% variance is acceptable.
I’ve recently worked at residences where the incoming voltage is as high as 248V
zbang
Senior Member
- Location
- Roughly 5346 miles from Earls Court
Assuming 240v nominal, +-5% is 228-252 volts so those are within "spec"; I might be concerned with the additional 5v drop under load, but what's the load doing that?
EVSE
- Location
- Illinois
- Occupation
- retired electrician
That will be covered by your state utility commission rules...as long as what the utility is supplying is with in those specs they are fine.
In Illinois, those voltages would be within the range specified by the Illinois Commerce Commission.
The rules specify a standard service voltage of 120 volts, but also specify that the voltage shall not drop below 113 or rise above 127. That result in a permissible line to line voltage range of 226 to 254. Any complaints to the utility for voltages within those ranges will be ignored.
In Illinois, those voltages would be within the range specified by the Illinois Commerce Commission.
The rules specify a standard service voltage of 120 volts, but also specify that the voltage shall not drop below 113 or rise above 127. That result in a permissible line to line voltage range of 226 to 254. Any complaints to the utility for voltages within those ranges will be ignored.
Thank you.
All good feedback here, I’ll just add because I was digging in to something similar today. ANSI table 84.1 may be good to reference , utility requirements obviously comes first but I think this is the table some get there standards from , shows acceptable tolerances
electrofelon
Senior Member
- Location
- Cherry Valley NY, Seattle, WA
Not necessarily. Some utilities have their own voltage specs which are tighter, one here does.
- Location
- Illinois
- Occupation
- retired electrician
not the way it works in Illinois
ptonsparky
Tom
- Occupation
- EC - retired
You need to consider if the VD is on the load end of the conductors you are responsible for or the POCOs.
We would install the conductors from the meter to the home and any VD on them would be Home Owners responsibility.
We would install the conductors from the meter to the home and any VD on them would be Home Owners responsibility.