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The original was posted on /r/electricians by /u/CommonImprovement403 on 2024-01-17 20:10:29+00:00.
Ok, I have an issue. I have a warehouse issue that I'm trying to unfuck. Utility says it's not on them, I've had them out twice. 277/480(268/468 is my reading) I have 8 rows of lights, 30 lights in each row set onto 4 lighting contactors controlled by 2 switches. A year ago, they had all the t-12 linear florescent changed out to LED. The LED retro kits are line voltage direct wire, four-4' LED tubes. The lights all worked fine for 6 months. Then they started having some bulbs becoming slower to come on, on 1 row. Then it got progressively worse. Now, things are wild. I can turn one switch on and some of the lights come on, hit the other switch and some of the others come on, turn the switch off, some more of the first lights come on and the others go off, turn that switch back on and the lights that did come on might come back. Now, I've pulled dedicated neutral and line back to each row. Still does the same thing. I can go to the lighting panel and turn breakers on and off and I can make all the lights come on. I have bypassed the contactor to check them, it's not the contactors. I'll link videos of this. I've been out here for 6 days trying to figure this out. I've had 5 other licensed electricians and I even called my buddy who's an electrical engineer. None of us have been able to figure this one out. I have line/neutral at each tombstone. Even the ones not working. You can also see all the fixtures working in the video before I turned the switches off and back on.