How was your issue detected?:
Primarily Sense Labs power quality monitor.
Did you noticed any other signs of this issue around your home?:
Lights will both flicker and noticeably dim for extended periods of time. Even relatively minor loads coming on – think less “AC” and more “TV” here! – will cause some flickering.
Screenshots from Sense Lab
- Sense Labs graph screenshots
From the last few days:
Sense Labs notification Screenshots
L1 v. L2 graph that @kevin1 likes
So what I’m looking for advice on is a little different than most of the posts here, where there are wild, but transient, sags and spikes on the line.
The 1000x voltage dips screenshot (all from the last 3 days, not 30, since 1000x is the maximum) is kind of misleading, because nearly all of those are where one of the line voltages drops below the threshold of 110V. The line isn’t particularly noisy but there’s very clearly a periodic dip in the base voltage coming from the utility.
Part of this is obviously attributable to peak demand, and the day graphs above where it’s most pronounced correspond to high cooling-degree days. So what I’m trying to suss out is:
To what extent is this actually a problem vs. “working as expected?” Should I reasonably expect the base utility voltage to be 106V to neutral if it’s a hot evening?
I’ve used National Grid’s “report an outage” tool for this twice in the last two weeks – one of their outage options online is “dim or flickering lights.” Once, two weeks ago, I never heard anything back. The second time, on Tuesday, National Grid sent a rep out but all they did was tell me they were doing work down the block that would probably resolve it that night.