You guys are really helpful. Being in between the electricians and hydro I am sure they are both trying to swat me away and not have to fix anything. Thank you for the correct terms - I'm a computer engineer, so the closest I've been to this stuff is textbooks.
OK. The correct problem is a...
Fortunately the utility measured the current at the same time. Here's some data from the logger at one spike. The logger captures min/avg/max during the 10 second interval, so I'm providing min. I guess the biggest question - could that surge cause dimming lights?
08:55:20 V1=341V, V2=344.9V...
Thanks for the feedback. This is a roughly 12000 square foot one-story building, in Canada. We have 347/600 coming in which then goes to our transformer then to panels. Utility has been on site and measured in underground, and at the transformer and they say OK, but they're probably doing...
We've just finished construction on our new office building, and have noticed the lights flickering frequently throughout the day. Had the utility company to measure and test everything and they claim it's within our building.
On several occasions I've measured a roughly 8V drop (for example...