Reply 1240 of 1335, by BitWrangler
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RandomStranger wrote on 2024-12-30, 13:47:Since that day this became a habit of the RCD, but only between 9AM and 6PM for some reason regardless if I was at home or not. […]
RandomStranger wrote on 2024-12-12, 15:47:A circuit breaker went off at around 10 AM and when I got home around 4PM the UPS was still on.
Since that day this became a habit of the RCD, but only between 9AM and 6PM for some reason regardless if I was at home or not. Really weird pattern. I've been looking for the issue for days since then. Now it seems that one of my power strips, a Hama 137239 with built-in overvoltage protection started acting up. Even if it's plugged in and nothing else connects to it so probably it's the overvoltage protection that causes the issue.
The bright side, it allowed me to really test out all 3 of my UPS-es.
Still, I can't fathom how can it be that the leaking current only happens during daytime, even though there is no difference in the devices being plugged in/used between me being away from home or me being asleep. It should happen randomly whether it's day or night. This initially lead me to believe that it's some transient coming from outside during business hours, but I was away from home for a week and just happened to unplug that along with some devices I already checked out.
I'll look into the power strip after new years and probably take out the overvoltage protection downgrading it to a regular power strip.
Quite often it's a simple MOV/Varistor in there that has degraded by taking too many hits, I went near crazy for a month or two back in '95 tracing intermittent reboots on my Amiga 1200, until I figured out my surge protector had gone faulty 🤣 . Somewhere here there was a good multi post discussion on replacing MOV in retro power distribution centers and such, but that's not coming up on my searches. One thread that's tangentially relevant with a couple of posts that give us some clues is Is it SAFE to plug a surge protector strip into a UPS .... anyway, as they degrade, quite minor voltage spikes can trigger them, until they start going short long enough to burn up.
Unicorn herding operations are proceeding, but all the totes of hens teeth and barrels of rocking horse poop give them plenty of hiding spots.