On Friday, August 14, 2020 at 10:37:21 PM UTC-4, David Lesher wrote:
Sorry to hear that. A friend in Denver just had this issue in the apartment
he moved into last week. He bought two
https://www.amazon.com/dp/B015H0A3FO
meters which made it quite clear.

At my advice he used the words "Open Neutral" and "Fire Hazard"
on the ticket. He also unplugged everything not run by UPS &
logged UPS input voltage every which made it quite clear.

The electrician took one look and called the PoCo. They
responded ~4 hours later. They soon found poorly torqued
neutrals in the 14 meter panel/ main disconnect.

The two phases then stayed equal and stable.

On your losses, check your homeowner's insurance coverage.

I already had one of those. It isn't very accurate. I drilled a tiny hole in the back of the case to adjust the calibration pot, without having to open it again.

I reported it to Duke Energy as an open Neutral. They canceled the order, because the so called 'smart' meter showed 245 volts. I threatened to turn them over to the Florida PUCO if they did it a second time. The woman told me that it was only logged as an outage. I told her that I didn't care what their computer showed, I had given the same information both times. Tat time they showed up. Te bare neutral was arcing on the Triplex service drop where it had cracked and separated. I saved one end of the broken conductor, for evidence.