Any suggestions are greatly appreciated.
The structure involved is a quad home.
The issue, all four tenants are complaining of light bulbs burning out too often. They say some bulbs only last a week. One tenant said he has even removed some bulbs from multi bulb fixtures to save on buying so many bulbs.
The utility says there are no problems on their end.
Since it affects all four units I suspect that there is a neutral problem between the structure and the transformer.
There is about 180? from transformer to the building, running under a parking lot that has drains. Also there is a fence post within 5? of the straight line from x-former to building. (You know what that could mean.) The feeder then terminates in a locked underground box 3? from the building. At this box four feeders go to four meters and panels. Each of the four units is set up as an individual service.
I think that due to having four households on this feeder, it is a balanced system most of the time, but there are some times when the balance is off enough that the neutral isn?t handling it causing an over voltage. This is an all electric building including heat and water heat, so there are plenty of two pole loads also.
I measured the voltage at an outdoor outlet during the day when no one was around and it was 120. (Note that in my area I?ve never seen a full 120 volts, this is the first time.) I also amped the ground rod and it was 0.
I could use some suggestions how to confirm a bad neutral or find the real problem. I know how to find a bad neutral on a single dwelling. But these are four apartments and access is not easy.
Thanks
Rick
The structure involved is a quad home.
The issue, all four tenants are complaining of light bulbs burning out too often. They say some bulbs only last a week. One tenant said he has even removed some bulbs from multi bulb fixtures to save on buying so many bulbs.
The utility says there are no problems on their end.
Since it affects all four units I suspect that there is a neutral problem between the structure and the transformer.
There is about 180? from transformer to the building, running under a parking lot that has drains. Also there is a fence post within 5? of the straight line from x-former to building. (You know what that could mean.) The feeder then terminates in a locked underground box 3? from the building. At this box four feeders go to four meters and panels. Each of the four units is set up as an individual service.
I think that due to having four households on this feeder, it is a balanced system most of the time, but there are some times when the balance is off enough that the neutral isn?t handling it causing an over voltage. This is an all electric building including heat and water heat, so there are plenty of two pole loads also.
I measured the voltage at an outdoor outlet during the day when no one was around and it was 120. (Note that in my area I?ve never seen a full 120 volts, this is the first time.) I also amped the ground rod and it was 0.
I could use some suggestions how to confirm a bad neutral or find the real problem. I know how to find a bad neutral on a single dwelling. But these are four apartments and access is not easy.
Thanks
Rick